Thanks Nigel - very informative as usual. Would definitely like a video on how to calculate battery storage - have had a couple quotes from installers but their estimates seem a bit random. Cheers
Hi, battery size depends what your objectives are. I have a heat pump, so thought the more the better, but in winter there is no significant solar production, and therefore charge the batteries on an off peak tariff. The longest off peak period I could get was 5 hours, so I sized my batteries for 5 hours at maximum charging. In summer my solar panels completely charge the batteries and then export, but I can’t afford any more. So I’ve ended up with 6 x 3.2kWh batteries, just under 20kWh. I don’t use 20kWh in summer, but in winter use 40kWh, so it’s a compromise.
@@Muppetkeeper Hi MK, thanks for helpful reply. Hadn't thought about off-peak charging capacity in winter and so far only really considered what solar I'm not able to use and could therefore be usefully stored. So much to think about in this game! Practically, to start with I think it will come down to what I can afford, then assess overtime and increase number of batteries later if budget allows. Interestingly both installers quoted for 7.2kW - maybe this in industry norm for a standard house (or they had 3 pylontech 2.4kW batteries going spare!!). ☺
Just about venture into the world of solar. Haven't done it before as it was a "new" tech. I have your obsession with data so useful to get a realistic view of the performance of your system. Thanks
Thanks for such useful information. I have an almost identical system (off grid in Portugal) and am just starting to use it so your videos are so helpful for us. Keep up the great work 👍🏻
I'm planning on building a similar setup (but without the PV at this stage) and use Octopus Go to charge the battery. A video on battery capacity and a more in-depth video of how it all bolts together would be most useful.
Fantastic update, I’ve been following your channel for a long time and it’s great to see your progress. I’m trying to spec a similar system, so the how spec a system guide would be most welcome. Thanks again for the update.
Very interesting video and set up. I can understand the desire to minimise grid import to zero, but in reality I find it adds up to little cost with my "cheaper" system vs the additional cost it would take to remove the issue - a cost benefit thing to take into account really. On days where the battery lasts all day (almost always at the moment) I import between 0.8 and 1.5KwH a day (not counting off peak use). About 20p at current rate, or say 45p when rates go up. It's a trade off.
Thanks Nigel you must feel very satisfied, years of work delivering a competent system. As you say, everyone needs to work out the the storage solution that meets their needs. If you can do a video on sizing that would probably be well received. Another subject that I find people are confused by and it is not helped by a lack of experienced installers is understanding the system at the next level of detail. Anything further on listing the components used and maybe a more detailed schematic of the system would help a lot of people. I suspect there is still reluctance with a lot of people in starting a conversation with a supplier because they don't want to look dumb. Perhaps they need to go back through your past shows but you know how people are! Anyway what I really wanted to say was CONGRATULATIONS on winning at the EV Puzzle. I suspect you won't stop perfecting but a little self congratulation is well deserved. 👍👌
Very kind mate, it does feel like we're getting there. It's a strategy and if I keep taking steps, even small ones in the right direction, well soon be way ahead of the game. I'll Wait until everything is perfect before releasing a schematic as there are few aspects that's arent to be rcommended and I'd like to get those sorted first.
@@EVPuzzle One question. Did you find Victron's information provided the guidance on their system you needed or did you or your installer have to do a lot of design work?
I decided most of the design myself following research, Victron helped with a coupleOf queries mainly about the physical mains wire size, width of cable as the 100amp stuff doesn't connect directly to the Victron
Agree. It’s a market that needs more support as it’s easy for installers to confuse you. NMC vs LiFePO4, AC vs DC, islanding or not, impacting FITs or not, etc. clearly lots being learned and sounds like good advice from Victron too.
Very timely. Thank you. Looking at BSS and asking the same questions as your first video. Based on your experience looks like I shall go for Victron + Pylon. Probably 4 units due to inverter threshold but was thinking of going over anyway to avoid being short. A sizing video would be great. I have built my own energy management system to divert excess PV to the immersion but the recent and expected energy price increases means I need do more. I expect the lead times have gone up since you ordered!
Fantastic update. thanks. Wonder if you could share a diagram of how it’s setup and explain the various blue boxes. Looking forward to some seasonal updates to see how it performs.
Got there in the end. Would've been so much simpler to just buy a powerwall of course but then I'd have paid Vat as it would've been in ages ago before the vat change 🤣
Welcome to the big battery club Nigel Our Powerwall takes 1.4 kw from the grid each month as it checks connection to the grid daily. It gives 5 kw peak power but doesn’t give you much control on when you want to charge the battery from the grid during the winter (as John Tisbury referred to) You have more capacity, (you can’t have too much), you have similar peak output and far more control over it and can add even more capacity if you wish. As soon as the solar starts to diminish in the autumn you will soon escape from your current ‘lazy’ ways.
Great video nigel very informative 👍. I think as you say doing a video on how to size batteries for a home install would be fantastic. I'm installing a ground source heat pump ev charger etc and will have it running of the same setup you have. But would be fantastic to know exactly what is involved. Thanks again for your insightful videos much appreciated 🙏
I think the CT clip is what's missing for the inverter to 'feed back' to the loads that are 'outside' it on the grid side, like your EV charging. Right now it can't tell the usage other than what's on your 'protected' side of the inverter.
Can you give me a breakdown of the cables used between the pylontech batteries and the inverter and what fusing there is? The web is full of queries re the pylontech cables and whether or not to use fuses etc. You obviously have a very robust system which would be worth copying.
You need to isolate between the battery and the inverter. The challenge I saw was working out the size of cable to use depending on how many batteries you connect. We split them into two banks and connected via a lynx device from victron. It just take a skilled installer that knows his stuff and doesn't use the wrong part, cables etc. My installer change ihis mind and upgraded the cables to thicker ones. Couldn't tell you the size, sorry There must be online documents describing power loads and cable sizing
Great video. I am currently ooking for an AC coupled inverter to add to my house energy store. I have installed an AC coupled system in my brothers house, using our own built battery of 10.5kwh from a nissan leaf reclaimed battery. Could you by and chance answer a question on the victron. The inverter we bought was is alittle slow reacting t house loads. Ie, when the kettle is switched on the inverter sees the oad then over period of 30 seconds then takes the load from the battery to supply the kettle, but in the first 30 seconds the grid supplies the load. Info from the manufacturer s that they have designed it this way to protect the power FET`s on the AC supply, and to aid to the inverters longetivty of life. What is the reaction time of the victron to a heavy load like a 3kw kettle being switched? Does the victron immediately supply the load? Thank you.
Anthony, I’m in the process of procuring a Multiplus-II setup similar to Nigel’s and from what I’ve read, the inverter is very fast to respond to both an increase and decrease in home load while minimising import and export. This is especially the case if you use the optional CT clamp. This CT clamp connects directly to the inverter rather than via the GX device and so can respond faster than if you use the ET112 energy meter. From what I understand, the response time is a few seconds but happy to be corrected if I’m, mistaken. I think there was a thread on this topic on the Victron Community forum which I would recommend joining if you haven’t already. Just search for Victron Community and you’ll find it. HTH.
How did you put your consumer unit on the right side of the victron unit as the victon can only provide 5kW of power, what if more is required the house would be limited.
@EVPuzzle thank you very much for confirming. What about when the grid is live, surely the victron is still limited to 5kW and provides the limiting factor.
Hello Nigel. We have the same battery setup, less the cabinet - went for the self spacing brackets for cooling etc, and its in the loft out of the way. Sofar invertor. All installed hassle free since November. Great VFM. BR Mark
@@EVPuzzle We live in a bungalow and the joists are 6x2, even so, they are sat on the joists over the porch brick piers. Yes, it is a great system - you forget how much you have been exporting over the years. This way, you are getting every last drop of the electricity generated. My wife cant keep up when using the washing machine, dishwasher etc, but she draws the line at ironing :)
@@xyredmax hello We are planning for the Victron with pylontect batteries. Would you put the batteries in the loft if you were doing it again and where is Victron located?
@@anthonycain6643 Hello You have to remember that we live in a bungalow with a high roof pitch and strong joists - I have located the batteries on the joists over the porch brick peers. Also, our mains comes in at this point, so connection to the DB is easy. The SoFar invertor is next to the batteries
I’ve just come across this channel on my hunt to get the best system. Is it possible for you to do a full breakdown on where the system was bought and how to instal everything, what can be done ourselves and what needs to be done by a professional? I’m still learning and it would help people like me who don’t have much knowledge on the technical side follow what you have done. Even a series would be much appreciated. Many thanx
Glad you found us. None of my install is DIY although it is possible with the right skills . I used an installer for everything as it means I'm certified and safe . All my components are listed in the description but I'll will produce a diagram soon and a video describing how it all connects . Victron have lots of great videos on this and Will Prowse does too. I'm not the best for electrical installation as I'm not an expert. My skill is in the design and data side , interpreting what's needed
Great video Nigel. yes please to a battery sizing etc vid, the winter will be a big test for battery sizing and to have an option increase if need be will be key in my view and to bare in mine your inverter selection /capability or even to have 2 inverters if your demand is to high for one inverter. there is so many things and maybes. was it hard to find an installer to install a Victron, i spoke to one and it was a sharp intake of breath response. i won't be having solar but invested in a wind turbine. fingers crossed my Niro will arrive in a few months. thanks
Brilliant video. Very informative. Could you perhaps produce a video going through the precise wiring schematic and actual installation for someone who wanted to repeat your installation? Keep it up! Andy
Hi Nigel, your last few videos have completely changed the landscape cot what I thought I needed. The obvious choice for most people is a Powerwall + Gateway. I have a 7.4kw solar and a 6000va 3phase inverter and looking to get some battery storage. I have checked with energy monkey who are quite local and stock all the components in your video. My consumption apart from normal household is a 3phase ASHP and Zappi so looking to do your solution on each phase and possibly add some more solar panels. I stumbled across your channel as I was originally looking at GivEnergy this makes more sense as I can place the batteries in the loft, fairly evenly spread out the weight. Thanks for the heads up on all of this, keep the videos coming.
I have the Multiplus but the GX version. I'm just playing at the moment and it is wired purely on the input only, I only have a 4kW array of solar PV. I am using a CT clamp to measure the total mains input and found that if the Victron batteries are fully charged and am producing enough solar to allow the Zappi to start charging on Eco++ then when a cloud comes over then the Victron will keep the minimum charge rate on the car going, so by moving the CT clamp to measure just my consumer unit and not the Zappi it stops the Victron from powering the Zappi. Somewhere in that explanation could be the solution you're after
The batteries are 33kg, you just need side rails rather than a full shelf. The rack ears just secure them in place. Looks for R0857K on penn Elcom site to see what I mean.
@@dansonamission I used these: "Ad Tek Rear19 inch Rack Mount Support Kit 150mm Deep" (should find them if you Google that!) to support the rear of the battery. Then just used cage nuts on the fronts. They seem to be holding ok!
@@ahooks good idea! Those would of come in handy recently for another project. We prefer the side rails for the batteries as it means you can remove the rack screws and slide the battery out.
@@dansonamission yeah, part of me wishes I'd put full rails in rather than rear rail supports, but easy enough to do at a later date. They've not dropped out the cab yet lol 😂
Well certainly not in Europe. EU will go offline regarding gas from Russia. And households need to get off the gas towards heatpumps and LNG is then used for heavy industries.
Interested in the battery storage video. Just moving into a house with air source heat pump so I will be all electric heating which must be a big draw on capacity
It can be v based on size of house. Friend has ashp 6kw in 3 bed modern home and it ticks over 600-700w. I hear some though are very greedy. Ours A2A ticks over 300-400w when up to temp
Hi Nigel, I have 4.8 KW PA Solar Panels across three roofs, This controlled by a Luxpowertek Hybrid invertor than also connects to my pylontech 2400s (4.8KWH). The slightly dissappointing thing is that the luxpowertek invertor only updates every 5 minutes.We a building a new house and I would like to have a system that gives me as close to realtime monitoring of the batteries. So your Victron multi plus caught my attention, however when I looked into it I found that it is an off grid battery invertor. So I am not sure whether it would make sense as we will be grid tied.
Hi just starting to try and plan a system and I want to try and use as much power from panels and batteries as much as possible. Can you also charge the battery from other sources say a generator ?
Potentially yes. In the victron range there's the quattro Inverters that have inputs for multiple grid and generator sources. Designed for off grid living
You will find that those battery packs are in reality well over the stated KWH capacity, this is how they can boast 95% discharge which would actually kill a lithium battery cell. Similarly charging to 100% will be well under 100% in the internal cells. This is done to reduce stress on the cells and increase lifespan. Cheap battery packs don't do this for obvious reasons and their lifespan is severely reduced because of it. You have a pretty good setup there, quality components that cost more but will be far more reliable. The Victron inverter is also one of the best with many useful features not found on cheaper alternatives.
You said your octopus energy meter read -2 when generating excess energy, my one only reads positive when we are generating as if we are drawing power, do you think this is right?
Hi Nigel. For a UK resident this goes a long way to solving the ‘puzzle’. Yes, a capacity video would be good and given our climate, more relevant than the US channels which go on about air con with seemingly endless sunshine!🙂. With regard to climate and battery performance/ longevity- is your garage heated (how?). Sorry if I’ve missed that. Thank you so much for sharing your experience.
No just a normal garage with a dark courted garage door that is a bit of a heater in summer. Batteries are fine in there, I've never seen them get too low in the 3 years I've been running batteries
@@EVPuzzle Thank you very much. The reason I asked is that I’m in Scotland and over night temperatures hover around freezing for at least a month in Winter. The most convenient location for batteries etc is an outhouse. I’ve never checked what the temperature inside it is (not enough data!!😀) but assumed it would be less than ideal. Now have to decide whether to just go ahead and put the batteries there or wait til I’ve monitored the temperature properly! Like you I have no mains gas and you are inspiring me to believe that I can make my home warm via self generated electricity. I really appreciate, not just the figures, but the ethos behind it. Thanks, again 👍
We've been watching your videos with interest. We are in the process of installing a Victron Multiplus 48/5000 along with pylontech batteries US5000 x 2. We are looking for a cabinet to store the batteries and wondered what size of cabinet you have ie how much air circulation is required around them. Any advice appreciated. Many thanks, Diane
Excellent solution, I'm glad to see that you are happy with your Victron solution as am preparing to fit all the components already purchased, all Victron including the 5000/50 multi, Victron shunt, distribution, and Cerbo GX so I was listening carefully to both of your videos before installing it all including my 12 x 400w 10A Perlight Modules. I cannot fit more modules in the garden because the hedges on both sides would shade too much but I might eventually install more on the roof of the annexe that I am currently building. As far as storage is concerned, I was looking at the 48V 100Ah LifePO4 battery Built-in BMS 5.12kWh from vladsmall and see how it performs after which I might stretch to one or two more. However, living alone, I don't seem to use more than 1.5kwh on a daily average over the 365 days although I will need more when my lab is ready. I hope to see your next video soon about the capacity meanwhile thans once again 🙏and keep up the good work 😉
Very nice. Thank you. I have been lucky enough to get my hands on a 5th US3000C. I'll install it when I get a chance. I think 17kWh will cover my needs too.
Hello I have just added a further 4 kW solar PV system to give us 8 kW combined. It is liberating have so much electricity generation ( during the summer period)
thank you for th VDO is that 15KW really enough if you charge your car ?My Car has a 55KWh battery and the coming one has a 77KWh battery, 15KWh seems a bit low Im building a 50KWh 3 phase system currently to support the cars and the house ( 15-20 KW per day usage w/o the cars or even heating)
Hi, I would be really interested in the battery capacity video, I came to solar with little knowledge and have learnt since installation and now want to reduce my power exporting as much as possible but, don’t want to overspend on capacity that won’t be used, having said that the system has only been in for 3 months and I have no experience of winter. So need some guidance, many thanks for your detailed information I am a bit of a data geek, many thanks and regards.
Hi Nigel, I have noticed that the installer of your eddi hasn’t given the recommended space around it. Does it not affect it? Great videos. Dave from Sudbury.
Good video. I have been recommended this system for my new build house with heat pump. The house is an eco build with high levels of insulation. Due to the power rating of the pump the system will be larger than your setup. Would it be worth waiting a year to see our usage before committing? Cheers Rich.
WOW. You have installed and commissioned something I have been working on, with an almost identical equipment spec. Please, please, please can you give us a how to wire video! I am happy with the DC side; I have two-panel arrays each wired to a Victron MPPT unit supplying 3.6kW 48V DC to 4.8kW batteries and 5kW Victron inverter. But how do you wire the AC side? Is the inverter “AC In” also AC out? The unit has TWO “AC Out” connections are they used? Happy if we end up with a manual Grid disconnect for power out, but would love an automatic version.
It's all Optional from what I can tell. There's lots of victron example diagrams on the interweb. I'll do a wiring schematic at some point but just waiting for it to be finalised. Think I'll add some of my solar on the AC out side too at the next opportunity
@@EVPuzzle If you have loads (such as car charger) upstream of your victron then without an et112 it wont be aware of it and therefore wont dump the battery into your car. The video above shows what i’ve learnt - as you will recall i was confused about the different ways of wiring them and why you would do it one way over another
Exactly and as I've always told my installe the et112 is in the wrong place, I'll get thee eventually. Its actually good having this issue as it proves what needs to be done. All the time I've looked at these systems the one common failing is an understanding about monitoring and CTs and their positions. Installers tend to focus on the physical wires and have little interest in the software. Sadly it's pretty critical stuff
@@EVPuzzle My solar is dc connected so nice and easy and interoperable. It may be more complicated with ac solar that doesn’t communicate with the victron directly (possibly multiple et112’s to monitor pv output and total draw from grid - i’m not sure as i dont have the issue)
I’m trying to get some quotes for a battery system but really really struggling to even get that as all supplies are so busy, any suggestions on that please? Also do you know if we still need to get a DNO if we are just adding a battery, (to an existing solar system) I don’t want to export from the battery? Thanks 😀
It's not whether you want to export its whether its capable of exporting. As for quotes, keep trying, and look at other options not just local or established installers.
Hi Nigel, I too would be interested in a video on how to calculate battery storage, currently taking daily winter usage of 15kw as my guide. Hope to get my G99 this month, only taken 3.5 months. No luck on getting a Smart Meter as we have a semi concealed gas meter (like all modern houses) Bulb says they can't take on these jobs at the moment. They won't do just the Elec. Meter. So it looks like I'll be unable to get a discounted tariff to go with our EV later this year. But on the bright side the DNO delay enables us to get a GivEnergy Hy 5 Gen 2 with a 3.6kw charge/discharge
Can I ask how you prioritise power distribution into the Eddie/battery? Did you have to put an additional CT on the the battery connected back to the Eddie/Myenergi hub (pg 31 of Eddie manual)
sorry, another question. do you need the Cerbo GX, what functions does it give you. Will the inverter work without the Cerbo, especially if running in lead acid mode. Thanks
@@EVPuzzle It was more of a question as to does the inverter need the cerbo to work, rather me needing one for the data, lik the sunny boy storage "needs" the sunny home manager to work, it wont operate without it, the same a the Solaredge hybrid inverter needs the interface to operate..... The sunny home manager is £500 and the solaredge interface is also roughly the same, its an additional cost to the system that you have to have in those cases.
@@anthonyevans7911 my understanding is that you need to have a GX device but the Cerbo is just one such device and there are others. You can also get a Multiplus-II with the GX device built in. There is a page on the Victron site describing the various GX devices so just search for “victron gx product range” and you’ll find it. I would post a link but sometimes that results in the comment being blocked on YT.
I wonder if you have done any calculations for Solar v Additional battery storage (instead of the Solar panels)? It must now be compared using the low 7.5p/Kwh 4 hour (12:30-04:30) using Octopus GO tariff. How much can a UK home draw into batteries in those 4 hours? Octopus uses 100% renewable supply, so green credentials OK.
As always thanks for sharing your experience Nigel. I would like to see how a video on the sizing of a battery storage system. Also, curious as to how your battery temperatures were / are in the current heatwave?
Battery and energy wise yes it's comfortably covered all peak usage. The surprising thing has been how much automation has been possible helping with saving sessions . It's really pleasing to have a flexible interface to control the battery fully. Sadly some systems don't offer simple controls let alone advanced ones. Victron was a really good choice if I say so myself
Automatically as in timers yes but automatically on Agile is the cheap time slots change, I could if I wanted yes as the Octopus data is available in advance for the prices and charging could be controlled dynamically setting grid set point. Currently the fixed period cheap tariff is easiest and best. Exporting intelligently is my quest for the future.. All Possible
A quick question how does the eddi integrate with victron ? I have a thermal store that is heated with the excess Solar can you dictate which takes the excess power first the eddi or the battery’s ? Thanks for the videos they are a great help !
Hi I am very interested in similar set up.But my knowledge and wife's worry of me doing the set up is a problem.Did you use a installer or set it up yourself? Regards Colin
Hi Nigel. I am about to install a solar panel system with Pylontech batteries. One question that comes to mind is whilst in your system you say you do not have to rely on the grid in the summer months as your energy comes from your panels, what about in the winter time when little power is coming from the panels? I assume you then have to export power from the grid to keep the batteries topped up. Is that correct?
Yes using octopus 🐙 GO which the best EV and solar friendly cheap rate energy tariff out there Imo. A couple of more expensive months in December and January are better than burning oil in the boiler
Hi Nigel do all of your panels feed in to this system? If so would you not have considered applying for permission to get a 5kw or 7kw inverter? Or is there more involved in this ? Thanks enjoyed watching your video
Being AC connected my solar is completely seperate to my battery but they all interact. I did consider bigger inverter options or two smaller parallel inverters but felt this was optimum for us without going crazy. It was easy to get carried away
Hi, thanks for the system update. A question on your battery SOC monitoring. Does it take into account the depth of discharge (DOD) of the battery? For example, my battery may indicate it is 100% full, but with say, a DOD of 20%, it has a usable capacity of 80%. I scaled my monitoring system so that it reads more correctly, i.e 100% SOC = 100% usable and 20% SOC = 0% usable. It gives me a much better view of how much charge I have left.
For me 100% represents the voltage set for the charging to stop so my headroom isn't shown. I prefer to see 10% as 10% . Not sure if I can calibrate it to show zero
Victron has multiple AC connections where other batteries has just the one. There's two inputs fur grid and shore power or generator for the marine market . Perfect for off grid but you can also connect av circuits to the AC out where it recognises protected circuits. In the event of a power failure the internal transfer switch flicks off isolating from the grid hence no back feeding is possible. The AC IN is disconnected but AC out stays working with the battery and everything on the out side. Google Victron transfer switch and look at the diagrams, there's some very clear ones out there. I'll be copying them to do my schematic
I think in a previous video you said you were concerned that you could not do I timed export with Victron. Is that the case, or have you been able to overcome this? Thanks
@@EVPuzzle Thanks Nigel. I'm also curious about how you manage to have such low peak grid usage. You have your entire house on the AC-Out of the MultiPlus and so the max capcity it can supply from battery only is (I believe) 4kW. On a cloudy day in winter when you have cooker, kettle, heating etc, surely you pull more than this? We certainly do!
Well trained to so one thing at a time but remember that's only relevant in a power cut situation. Victron peaks well above that of course for short bursts
Interesting video but I’m not sure what you mean about ramp up and down being a function of the battery. Surely this is the inverter? The current can flow in and out of the battery instantaneously by definition
Thanks, Nigel for your video series. My Fox System is soon to be going in and I did a lot of work on the sizing. i don't want to size for the worst-case winter's day 16 kWh (excluding EV charging) but provide ESS to cover the base load and then some ie what I would need on an average spring/autumn day with my 4.8 kW PV. I'm happy to export during the day or charge my 10.5 kWh SunAmp Heat Battery (Heat Store for DHW) in summer and in winter and top up the ESS and Heat Store from off-peak EV tariff in the winter. The PV calculation is that it should meet 50% of my current annual consumption needs and I also have invested in Wind-Farm co-operative to meet the other 50%. The Windfarm element means it wouldn't pay me to eliminate Grid import as I need this to collect on the Wind-farm payout.
Hi Nigel, interesting conversation. Did you get your Zappy not seeing your battery issue sorted? Also I was confused about your explanation of your consumer unit being all on AC out1 (the protected side of the Multiplus 2). My understanding is that the 50A capacity of the Multiplus 2 is total draw across AC out 1 and 2, and that the total draw of AC out 1 when the grid is offline is only 20A. can I assume that you have not had a power outage and tried to turn on multiple high voltage loads (eg cooker, water heater and aircon)? Take care D
I've not been bothered so far tbh. I know what I need to do though should it bother me going forwards. Myenergi currently shows zero house use when the battery is covering the house load which is sort of reasonable. Only down is side is house usage values do not include battery use until the next day when battery charging counts as house use which is does as its either Grid or solar energy going into a device connected to the house. One day I'll set it up as an exercise
Hi Nigel, thanks for the update, that was excellent, I keep on learning things from your videos. Do you think you would be willing and able to put up a wiring diagram of your system, showing every component including your solar panels. I would really love to see that. As for your next video, my thoughts on sizing are, we use between 8-10kw a day, so I want 30kwh of storage, in the hope that with what little solar we get in the winter, this capacity will get us though a cloudy 4-6 days, as I'm sure we will get some solar to either use directly or top up the batteries. Cheers Nige, keep up the excellent work.
@@gavinnoname1424 Hi Gavin. I've always liked the Givenergy batteries, they are the cheapest on the market and look much nicer than the Pylontech ones. I went to the Fully charged show and spoke with Givenergy who assured me they have sorted the ramp up/down issue. But to be honest I'm not that bothered. Nigel makes some good points about the Pylontech. 30kwh sounds a lot, but as I'm also going to install air to air heat pumps, multi head, x2, and a Mixergy tank, our electricity usage will go up significantly, so 30kwh won't be a crazy amount, and probably won't buy us as long as I'd like through the winter months.
@@HOMEAROMAS I am not too familiar with the Givenergy range but if I recall their batteries can only be used with their own inverter. Have you considered doing a DIY battery? I went down the route of purchasing 16x 280ah LifePo4 batteries and a BMS. Which cost £1,800 delivered. This gives me a 13KWH battery for under £2K. ....or 26Kwh for £4K
Hi Andrew, I’m also based in central Scotland (near Dalry North Ayrshire) and will be doing a self-installation of Multiplus-II 5kVA and Pylontech 9.6kWh soon. If you are competent with electrics then you can potentially install everything yourself and get it inspected by your local building control dept. Or you could get a general electrician to install the new circuit for the Multiplus but connect up the Multiplus yourself to the AC isolator and do all the DC stuff yourself. That all said, even the DC side is very dangerous if you get it wrong so only consider any DIY work if you have relevant knowledge and experience. If you’re looking for a one-stop shop installer to do everything then a decent solar PV installer should have most of the skills needed even if they’ve not worked with batteries before. I expect they’ll be keen to expand their knowledge into ESS systems if they can find a willing guinea pig. :) Unfortunately, finding a solar installer who isn’t booked out for the next 9 months is probably not easy right now. Before I decided to go down the Victron/Pylontech route, I got a quote for a Powerwall 2 and the earliest date was next March! That was a couple of months back so it’s probably worse now. The other thing you’ll need to think about is getting DNO approval which will be easier or harder depending on whether you go for a 3.68kW G99 system. I’m currently trying to obtain G99 DNO approval from SP Energy Networks which seems to be a bit more challenging than with some other DNOs but I’ll get there! :) HTH.
@@craigchamberlain Hi Craig, Thanks for your response. I've been working with a victron/pylontech stockist who have been amazingly helpful; they can get the hardware though I'd probably have to go via a company to actually buy it. Unfortunately we're struggling to get an installer. It sounds like we're looking at the same kit and in a similar position though you are further down the line so I'd really appreciate any steer on things. Started to look at the G99 but got cold feet pretty quickly with it. I don't have electrical experience beyond changing electrical sockets and setting up my shed solar install 🙂 so might have to try to find a willing electrician or general PV installer. If you would be ok to share your system design and g99 with me I'd really appreciate it though. I am mulling over the self install route. I have reached out to a PV installer to see if they might be interested too but suspect availability to be an issue. Many thanks Andrew
@@andrewp3648 sorry for the delay replying but unfortunately my G99 application has been put on the back-burner due to the ENA database not yet being updated to reflect the updated type testing certificate for the Multiplus-II 48/5000/70-50. What I can tell you is that my DNO (SPEnergy) has said that my installation does NOT qualify for fast-track G99 because I am only installing a battery storage system and not a battery + PV installation. So I might change my application to include both as that is my end goal anyway. I was just trying to keep it simple. I have also been told that it’s not a given that my system will be approved even though it’s only a 4.4kW inverter and G98 allows up to 3.68kW without requiring DNO permission in advance. Apparently the network is struggling to cope but frankly I file that under “not my problem” because DNOs should NOT be obstructing people like us who are spending large sums of our own money to provide distributed generation and battery storage which will ultimately help the grid. Another frustration for me is that there seems to be a significant lag in email communications with SP Energy even to the point where they send out automated emails wondering why I’ve not responded to them even though I’ve sent two emails which have not been acknowledged yet. Then I phone in and talk to the agent and agree an approach only for them to read a belated email and take a different approach. So the result of this is that my application has been “archived” and I need to start again. Anyway, I’ve got all my equipment now so I guess I’ll just have to play around “off-grid” until ENA get around to ticking the “compliant” box for the inverter and I can restart the DNO G99 application process. Will keep in touch.
Hi Craig / Andrew, I know it’s been a while since you posted but I was wondering how you got on with your G99 application with SP? I am in West Kilbride, North Ayrshire and have just submitted a G99 application. I want to add a 14.3kW Seplos battery pack and a Victron Multiplus 2 48/5000 inverter to my existing 3.6kW Solaredge / Eddi PV system. I am now doubtful that SP will approve the 8kW combined output and, if approved, may require some limiting. From what I have read on other forums inverter limiting may need to be done by an installer as it should be password protected from the end user. Also it looks like the Solaredge 3680HD may not be G99 compliant. (It is G98 compliant). I intend to diy install and try to find an Electrician or installer to do the necessary testing and BS paperwork required for final DNO sign off. Did you find someone to do that in the area to install / commission? Waiting for SP to respond to application but not holding my breath.😳 Many thanks.
@@billgoldie3212 I have to admit that I ended up abandoning the victron route due to lack of a willing installer. Ended up going with givenergy in the end which wasn't quite what I wanted but is working fairly well so far
We now, at long last have our pylontech batteries and Victron multiplus. We are about to start installation. We notice that several people have asked for schematics of your system. Do you have any plans to do one, as it would be very helpful to us? Many thanks
Hi Nigel, another great video.... good to get the update on the previous battery installation video and it's great to hear that it is going so well. Just preparing the G99 and ensuring I've got all the components I need for an almost identical install. Can I just check a couple of things with you, please? - Somewhere (maybe in the comments?) you mentioned that the 100 amp mains cables won't fit directly into the inverter, due to cable sizes, I think. How did you overcome this? - What is the purpose of including a lynx DC distributor and where have you integrated this into your system? Thanks Nigel, keep up the great work. There are so many people who appreciate all that you're doing!
We used the consumer unit wiring which isn't so thick . Victron recommend splitting it into two cables rated 50a but we didn't need to in the end . This is where sparky knowledge is key know cable ratings etc As we had 5 batteries that meant two stacks as they go in 4s. Lynx enabled seperate cables and less heat in the cables ...I believe. Belt and braces
Another requirement some users may have is location of a supplier. I live in SW London but there seem to be no local Victron product suppliers the nearest being in the Medway area (75 mins), Hampshire (60 mins) or Essex (90 mins). It has surprised me that in the south east (~20 million potential customers) there are just 4 suppliers. The midland and north have many suppliers and there even 2 in your neck of the woods. I wonder if this will have an impact on the availability of people available locally to help with an install.
Yeah it'll be interesting when winter comes around. I've got 2 x US3000C pylontech batteries which overnight drop to about 50%. I was contemplating 3 batteries but didn't think on the darker days they'll fill up. Had one dull day up here in York last week and it took best part of the day to fill. But, I've only had solar for a month now so still learning!
@@ahooks Winters are tough sometimes I produce negligible amount off electricity from my 2.8kWh system in December 0.2-0.3 kWh for whole day when in May my system produced 17kWh in best day . Need wind turbine for winter ;)
In the video channel by Will Prowse, he has created several videos in which he looks at how batteries in a stack discharge. Across the videos he seems to have compelling results that show without some thought, one of the batteries will charge/discharge more frequently which is likely to shorten the life of that battery. Have you done anything (do you need to do anything) with your stack to ensure the batteries are used equally. Or do you think its doesn't matter much?
That depends on the BMS and batteries in use. His videos are often using raw batteries and a seperate BMS and monitor. My system has this all built in, balancing occurs by default within the pylontech system where they are all connected together with dtaa cables not just power cables
Very interesting content, thanks. A video on battery size would be very useful, having spent the last 6 months trying to get some quotes I’ve come to realise that DIY maybe the way forward (with the help of an electrician). G
That's the exact route I have gone. Kit arrived recently and I have been testing with it, and have built up a good understanding of all the settings/connectivity/BMS/NodeRed/HomeAssistant. Finding an installer who knows, or is prepared to install Victron has been hard. I think I found a solution through....I spoke to a sparky (friend of friend) who would like to make a move into energy storage, but he is in a catch22 as he doesn't have experience with battery/inverter, so would struggle to get customers.....and no ESS customers means no experience. Anyway, I am hoping that between us we can have a low cost installation, and he can gain the experience(photos/casestudy for website)
@@EVPuzzle I have no solar, so this will be redeploying Octopus 5p electricity during the day. So think I should be OK with just G99. (Although happy for you to point out anything that u may be missing)
Thanks Nigel - very informative as usual. Would definitely like a video on how to calculate battery storage - have had a couple quotes from installers but their estimates seem a bit random. Cheers
Hi, battery size depends what your objectives are. I have a heat pump, so thought the more the better, but in winter there is no significant solar production, and therefore charge the batteries on an off peak tariff. The longest off peak period I could get was 5 hours, so I sized my batteries for 5 hours at maximum charging. In summer my solar panels completely charge the batteries and then export, but I can’t afford any more. So I’ve ended up with 6 x 3.2kWh batteries, just under 20kWh. I don’t use 20kWh in summer, but in winter use 40kWh, so it’s a compromise.
@@Muppetkeeper Hi MK, thanks for helpful reply. Hadn't thought about off-peak charging capacity in winter and so far only really considered what solar I'm not able to use and could therefore be usefully stored. So much to think about in this game! Practically, to start with I think it will come down to what I can afford, then assess overtime and increase number of batteries later if budget allows. Interestingly both installers quoted for 7.2kW - maybe this in industry norm for a standard house (or they had 3 pylontech 2.4kW batteries going spare!!). ☺
@@timf7268 there is a very good chance that they are selling what they think they can get. No one has anything in stock these days.
Just about venture into the world of solar. Haven't done it before as it was a "new" tech. I have your obsession with data so useful to get a realistic view of the performance of your system. Thanks
Thanks for such useful information. I have an almost identical system (off grid in Portugal) and am just starting to use it so your videos are so helpful for us. Keep up the great work 👍🏻
I'm planning on building a similar setup (but without the PV at this stage) and use Octopus Go to charge the battery. A video on battery capacity and a more in-depth video of how it all bolts together would be most useful.
Extre3mely interesting and YES please do the sizing video. I am right at the start of my journey and sizing is exactly what is boggling my mind 🙂
Fantastic update, I’ve been following your channel for a long time and it’s great to see your progress. I’m trying to spec a similar system, so the how spec a system guide would be most welcome. Thanks again for the update.
Good to see your getting the Pylon batteries Modular design gives you great flexibility.
ive just had 3 of those batteries installed on a 3kw pv system. so much fun fiddling with the app.
Very interesting video and set up. I can understand the desire to minimise grid import to zero, but in reality I find it adds up to little cost with my "cheaper" system vs the additional cost it would take to remove the issue - a cost benefit thing to take into account really. On days where the battery lasts all day (almost always at the moment) I import between 0.8 and 1.5KwH a day (not counting off peak use). About 20p at current rate, or say 45p when rates go up. It's a trade off.
Best video for filling in my vast gaps of knowledge on what to get etc. Have you made the video about what size battery you need? I need that video 😁
No Im scripting it this week hopefully after the monthly stats video.
Test driving MG4 and cupra born getting in my way
@@EVPuzzle perfect I look forward to it
I certainly would be interested in those figure as we are about to go down that road and you have sold me on the batteries.
Very interesting update. Looking forward to the sizing video.Thank you.
It's on my list to produce ..
Thanks Nigel you must feel very satisfied, years of work delivering a competent system. As you say, everyone needs to work out the the storage solution that meets their needs. If you can do a video on sizing that would probably be well received. Another subject that I find people are confused by and it is not helped by a lack of experienced installers is understanding the system at the next level of detail. Anything further on listing the components used and maybe a more detailed schematic of the system would help a lot of people. I suspect there is still reluctance with a lot of people in starting a conversation with a supplier because they don't want to look dumb. Perhaps they need to go back through your past shows but you know how people are!
Anyway what I really wanted to say was CONGRATULATIONS on winning at the EV Puzzle. I suspect you won't stop perfecting but a little self congratulation is well deserved. 👍👌
Very kind mate, it does feel like we're getting there. It's a strategy and if I keep taking steps, even small ones in the right direction, well soon be way ahead of the game.
I'll Wait until everything is perfect before releasing a schematic as there are few aspects that's arent to be rcommended and I'd like to get those sorted first.
@@EVPuzzle One question. Did you find Victron's information provided the guidance on their system you needed or did you or your installer have to do a lot of design work?
I decided most of the design myself following research, Victron helped with a coupleOf queries mainly about the physical mains wire size, width of cable as the 100amp stuff doesn't connect directly to the Victron
Agree. It’s a market that needs more support as it’s easy for installers to confuse you. NMC vs LiFePO4, AC vs DC, islanding or not, impacting FITs or not, etc. clearly lots being learned and sounds like good advice from Victron too.
Very timely. Thank you. Looking at BSS and asking the same questions as your first video. Based on your experience looks like I shall go for Victron + Pylon. Probably 4 units due to inverter threshold but was thinking of going over anyway to avoid being short. A sizing video would be great.
I have built my own energy management system to divert excess PV to the immersion but the recent and expected energy price increases means I need do more. I expect the lead times have gone up since you ordered!
Thanks really Informative I've just started my research into getting a domestic battery system, and look forward to that up coming vid
Fantastic update. thanks. Wonder if you could share a diagram of how it’s setup and explain the various blue boxes. Looking forward to some seasonal updates to see how it performs.
Sorry Alan, I asked if Nigel could do a diagram, but before I started reading the comments, so hadn't seen that you'd already asked.
Excellent update Nigel, thanks
Great to hear things have worked out for your setup and your choice. Always good to have a spare battery - you will use it going forwards I'm sure.
Got there in the end. Would've been so much simpler to just buy a powerwall of course but then I'd have paid Vat as it would've been in ages ago before the vat change 🤣
@@EVPuzzle at least you have full control over your system and if you choose can add additional packs at a sensible price.
Yep although prices have shot up neay 20% save as vat saving.. Coincidence?
@@EVPuzzle blatant profiteering
@@EVPuzzle I thought you still had to pay VAT on just a battery systems? I thought you only did not pay VAT on a solar & battery system?
Welcome to the big battery club Nigel
Our Powerwall takes 1.4 kw from the grid each month as it checks connection to the grid daily. It gives 5 kw peak power but doesn’t give you much control on when you want to charge the battery from the grid during the winter (as John Tisbury referred to)
You have more capacity, (you can’t have too much), you have similar peak output and far more control over it and can add even more capacity if you wish.
As soon as the solar starts to diminish in the autumn you will soon escape from your current ‘lazy’ ways.
You're right, we always want more
Great video nigel very informative 👍. I think as you say doing a video on how to size batteries for a home install would be fantastic. I'm installing a ground source heat pump ev charger etc and will have it running of the same setup you have. But would be fantastic to know exactly what is involved. Thanks again for your insightful videos much appreciated 🙏
Hi ,thanks for providing best ideas ,just could be possible to get information from where you get cabinet for batteries,
I think the CT clip is what's missing for the inverter to 'feed back' to the loads that are 'outside' it on the grid side, like your EV charging. Right now it can't tell the usage other than what's on your 'protected' side of the inverter.
All fixed now, usb cable to the meter was faulty. A cable!
Thanks - yes very interested in sizing calcs etc. Videos much appreciated
Can you give me a breakdown of the cables used between the pylontech batteries and the inverter and what fusing there is? The web is full of queries re the pylontech cables and whether or not to use fuses etc. You obviously have a very robust system which would be worth copying.
You need to isolate between the battery and the inverter. The challenge I saw was working out the size of cable to use depending on how many batteries you connect. We split them into two banks and connected via a lynx device from victron. It just take a skilled installer that knows his stuff and doesn't use the wrong part, cables etc. My installer change ihis mind and upgraded the cables to thicker ones. Couldn't tell you the size, sorry
There must be online documents describing power loads and cable sizing
Great video.
I am currently ooking for an AC coupled inverter to add to my house energy store.
I have installed an AC coupled system in my brothers house, using our own built battery of 10.5kwh from a nissan leaf reclaimed battery. Could you by and chance answer a question on the victron.
The inverter we bought was is alittle slow reacting t house loads.
Ie, when the kettle is switched on the inverter sees the oad then over period of 30 seconds then takes the load from the battery to supply the kettle, but in the first 30 seconds the grid supplies the load. Info from the manufacturer s that they have designed it this way to protect the power FET`s on the AC supply, and to aid to the inverters longetivty of life.
What is the reaction time of the victron to a heavy load like a 3kw kettle being switched? Does the victron immediately supply the load?
Thank you.
Anthony, I’m in the process of procuring a Multiplus-II setup similar to Nigel’s and from what I’ve read, the inverter is very fast to respond to both an increase and decrease in home load while minimising import and export. This is especially the case if you use the optional CT clamp. This CT clamp connects directly to the inverter rather than via the GX device and so can respond faster than if you use the ET112 energy meter. From what I understand, the response time is a few seconds but happy to be corrected if I’m, mistaken. I think there was a thread on this topic on the Victron Community forum which I would recommend joining if you haven’t already. Just search for Victron Community and you’ll find it. HTH.
@@craigchamberlain Thanks Craig. Ill search out that support group tonight or in the morning.
How did you put your consumer unit on the right side of the victron unit as the victon can only provide 5kW of power, what if more is required the house would be limited.
Yes house is limited to 5k in a power cut but everything works
@EVPuzzle thank you very much for confirming. What about when the grid is live, surely the victron is still limited to 5kW and provides the limiting factor.
yes please for battery sizing, just started process of ordering a home system with 2 of your batteries but should I stretch to 3🤷🏼♂️🙂
Hello Nigel. We have the same battery setup, less the cabinet - went for the self spacing brackets for cooling etc, and its in the loft out of the way. Sofar invertor. All installed hassle free since November. Great VFM. BR Mark
Wow 5 in the loft hope that's spread over a few joists 😉
Great system. Isn't it
@@EVPuzzle We live in a bungalow and the joists are 6x2, even so, they are sat on the joists over the porch brick piers. Yes, it is a great system - you forget how much you have been exporting over the years. This way, you are getting every last drop of the electricity generated. My wife cant keep up when using the washing machine, dishwasher etc, but she draws the line at ironing :)
@@xyredmax hello
We are planning for the Victron with pylontect batteries. Would you put the batteries in the loft if you were doing it again and where is Victron located?
@@anthonycain6643 Hello You have to remember that we live in a bungalow with a high roof pitch and strong joists - I have located the batteries on the joists over the porch brick peers. Also, our mains comes in at this point, so connection to the DB is easy. The SoFar invertor is next to the batteries
What are you doing to keep pv running while grid is out . Victron drives output frequency to 53Hz a d inverter is nearly down to zero
Nothing right now.. Power cuts are rare and short so not much justification.
One day I'll. Move some pv to the AC out side
I’ve just come across this channel on my hunt to get the best system. Is it possible for you to do a full breakdown on where the system was bought and how to instal everything, what can be done ourselves and what needs to be done by a professional? I’m still learning and it would help people like me who don’t have much knowledge on the technical side follow what you have done. Even a series would be much appreciated. Many thanx
Glad you found us. None of my install is DIY although it is possible with the right skills . I used an installer for everything as it means I'm certified and safe .
All my components are listed in the description but I'll will produce a diagram soon and a video describing how it all connects . Victron have lots of great videos on this and Will Prowse does too. I'm not the best for electrical installation as I'm not an expert. My skill is in the design and data side , interpreting what's needed
Great video and thanks for sharing :) Looking forward to the next video.
Great video Nigel. yes please to a battery sizing etc vid, the winter will be a big test for battery sizing and to have an option increase if need be will be key in my view and to bare in mine your inverter selection /capability or even to have 2 inverters if your demand is to high for one inverter. there is so many things and maybes. was it hard to find an installer to install a Victron, i spoke to one and it was a sharp intake of breath response. i won't be having solar but invested in a wind turbine. fingers crossed my Niro will arrive in a few months. thanks
Brilliant video. Very informative.
Could you perhaps produce a video going through the precise wiring schematic and actual installation for someone who wanted to repeat your installation?
Keep it up!
Andy
Sorry I'm not an engineer or electrician so out my depth giving physical install advice. Victron give.lots of install examples online to follow.
Please do the video on sizing batteries.
Hi Nigel, your last few videos have completely changed the landscape cot what I thought I needed. The obvious choice for most people is a Powerwall + Gateway. I have a 7.4kw solar and a 6000va 3phase inverter and looking to get some battery storage. I have checked with energy monkey who are quite local and stock all the components in your video. My consumption apart from normal household is a 3phase ASHP and Zappi so looking to do your solution on each phase and possibly add some more solar panels. I stumbled across your channel as I was originally looking at GivEnergy this makes more sense as I can place the batteries in the loft, fairly evenly spread out the weight. Thanks for the heads up on all of this, keep the videos coming.
Glad to have helped. Handy having energy monkey near by. Decent prices
I have the Multiplus but the GX version. I'm just playing at the moment and it is wired purely on the input only, I only have a 4kW array of solar PV.
I am using a CT clamp to measure the total mains input and found that if the Victron batteries are fully charged and am producing enough solar to allow the Zappi to start charging on Eco++ then when a cloud comes over then the Victron will keep the minimum charge rate on the car going, so by moving the CT clamp to measure just my consumer unit and not the Zappi it stops the Victron from powering the Zappi. Somewhere in that explanation could be the solution you're after
That's exactly as it should work, my wiring is a little unique lol so needs a few adjustments, won't be long and it'll all be perfect
Could you not use cage nuts instead of shelves ?
The batteries are 33kg, you just need side rails rather than a full shelf. The rack ears just secure them in place. Looks for R0857K on penn Elcom site to see what I mean.
@@dansonamission I used these: "Ad Tek Rear19 inch Rack Mount Support Kit 150mm Deep" (should find them if you Google that!) to support the rear of the battery. Then just used cage nuts on the fronts. They seem to be holding ok!
@@ahooks good idea! Those would of come in handy recently for another project. We prefer the side rails for the batteries as it means you can remove the rack screws and slide the battery out.
@@dansonamission yeah, part of me wishes I'd put full rails in rather than rear rail supports, but easy enough to do at a later date. They've not dropped out the cab yet lol 😂
@@dansonamission very handy to know
Many thanks for your info…and yes please “how do you work out storage for a particular home”..video would be very helpful…again,many thanks..
Do you have a wiring schematic on what you have setup now ?
In progress
@@EVPuzzle Also did you look at the Pylon Force-L2 Low Voltage System 14.2kWh - Is this more cost effective than separate batteries ?
What AWG cable do you use from the batteries to the inverter? I imagine with a number of batteries this would need to be quite thick?
It's split into two strings but yes they're not thin
It makes sense now to go the battery storage route. Really can’t see energy prices falling anytime soon, if at all.
Was thinking the same, especially if they end up rationing power during the day.
Well certainly not in Europe. EU will go offline regarding gas from Russia. And households need to get off the gas towards heatpumps and LNG is then used for heavy industries.
Hi Nigel, why the Cerbo GX and not the GX included Victron ? Thanks Andrew
Not all Victron include gx. External is more capable
Can you provide details of the cabinet needed for the Pylontec batteries?
Interested in the battery storage video. Just moving into a house with air source heat pump so I will be all electric heating which must be a big draw on capacity
It can be v based on size of house. Friend has ashp 6kw in 3 bed modern home and it ticks over 600-700w. I hear some though are very greedy. Ours A2A ticks over 300-400w when up to temp
Hi Nigel, I have 4.8 KW PA Solar Panels across three roofs, This controlled by a Luxpowertek Hybrid invertor than also connects to my pylontech 2400s (4.8KWH). The slightly dissappointing thing is that the luxpowertek invertor only updates every 5 minutes.We a building a new house and I would like to have a system that gives me as close to realtime monitoring of the batteries. So your Victron multi plus caught my attention, however when I looked into it I found that it is an off grid battery invertor. So I am not sure whether it would make sense as we will be grid tied.
Hi just starting to try and plan a system and I want to try and use as much power from panels and batteries as much as possible. Can you also charge the battery from other sources say a generator ?
Potentially yes. In the victron range there's the quattro Inverters that have inputs for multiple grid and generator sources. Designed for off grid living
are those 15s due to 48 v and no 51,2 like the average rack out there ? ? ?? or they use less charge voltage for long term efficience ? ? ?
You will find that those battery packs are in reality well over the stated KWH capacity, this is how they can boast 95% discharge which would actually kill a lithium battery cell. Similarly charging to 100% will be well under 100% in the internal cells. This is done to reduce stress on the cells and increase lifespan. Cheap battery packs don't do this for obvious reasons and their lifespan is severely reduced because of it. You have a pretty good setup there, quality components that cost more but will be far more reliable. The Victron inverter is also one of the best with many useful features not found on cheaper alternatives.
I agree good manufacturers build resilience in. I can't wait to try some full charge and discharges to se that capacity we really have
You said your octopus energy meter read -2 when generating excess energy, my one only reads positive when we are generating as if we are drawing power, do you think this is right?
Some seem to be stuck not showing export like mine. Not sure why
Hi Nigel. For a UK resident this goes a long way to solving the ‘puzzle’.
Yes, a capacity video would be good and given our climate, more relevant than the US channels which go on about air con with seemingly endless sunshine!🙂. With regard to climate and battery performance/ longevity- is your garage heated (how?). Sorry if I’ve missed that. Thank you so much for sharing your experience.
No just a normal garage with a dark courted garage door that is a bit of a heater in summer. Batteries are fine in there, I've never seen them get too low in the 3 years I've been running batteries
@@EVPuzzle Thank you very much. The reason I asked is that I’m in Scotland and over night temperatures hover around freezing for at least a month in Winter. The most convenient location for batteries etc is an outhouse. I’ve never checked what the temperature inside it is (not enough data!!😀) but assumed it would be less than ideal. Now have to decide whether to just go ahead and put the batteries there or wait til I’ve monitored the temperature properly! Like you I have no mains gas and you are inspiring me to believe that I can make my home warm via self generated electricity. I really appreciate, not just the figures, but the ethos behind it. Thanks, again 👍
How do you isolate from the grid for maintenance, ie fitting new MCBs to the main fuse board for instance?
We've been watching your videos with interest. We are in the process of installing a Victron Multiplus 48/5000 along with pylontech batteries US5000 x 2. We are looking for a cabinet to store the batteries and wondered what size of cabinet you have ie how much air circulation is required around them. Any advice appreciated. Many thanks, Diane
Air between the batteries is preferred but not essential it seems . I'm using an 18 u cabinet, should've been 20u± ideally
@@EVPuzzle Thanks Nigel, that's very helpful.
I’d appreciate whatever information you have coming!
I’m still a couple years out but love learning! I follow Andy on TH-cam outback garage!
Thank you
Help please on sizing a system we have a huge power range across the year. From 11 to 50kwh per day.
Coming soon
Excellent solution, I'm glad to see that you are happy with your Victron solution as am preparing to fit all the components already purchased, all Victron including the 5000/50 multi, Victron shunt, distribution, and Cerbo GX so I was listening carefully to both of your videos before installing it all including my 12 x 400w 10A Perlight Modules. I cannot fit more modules in the garden because the hedges on both sides would shade too much but I might eventually install more on the roof of the annexe that I am currently building. As far as storage is concerned, I was looking at the 48V 100Ah LifePO4 battery Built-in BMS 5.12kWh from vladsmall and see how it performs after which I might stretch to one or two more. However, living alone, I don't seem to use more than 1.5kwh on a daily average over the 365 days although I will need more when my lab is ready. I hope to see your next video soon about the capacity meanwhile thans once again 🙏and keep up the good work 😉
Very nice. Thank you.
I have been lucky enough to get my hands on a 5th US3000C. I'll install it when I get a chance. I think 17kWh will cover my needs too.
Awesome, hope it wasn't too expensive
Battery sizing vid would be much appreciated.
Hello I have just added a further 4 kW solar PV system to give us 8 kW combined. It is liberating have so much electricity generation ( during the summer period)
thank you for th VDO
is that 15KW really enough if you charge your car ?My Car has a 55KWh battery and the coming one has a 77KWh battery, 15KWh seems a bit low
Im building a 50KWh 3 phase system currently to support the cars and the house ( 15-20 KW per day usage w/o the cars or even heating)
Hi, I would be really interested in the battery capacity video, I came to solar with little knowledge and have learnt since installation and now want to reduce my power exporting as much as possible but, don’t want to overspend on capacity that won’t be used, having said that the system has only been in for 3 months and I have no experience of winter. So need some guidance, many thanks for your detailed information I am a bit of a data geek, many thanks and regards.
Hi Nigel, I have noticed that the installer of your eddi hasn’t given the recommended space around it. Does it not affect it? Great videos. Dave from Sudbury.
Not that I've noticed . Hardly any heat off it to be concerned about
Who was the installer?
Good video. I have been recommended this system for my new build house with heat pump. The house is an eco build with high levels of insulation. Due to the power rating of the pump the system will be larger than your setup. Would it be worth waiting a year to see our usage before committing? Cheers Rich.
It's modular so as long as you leave room for another battery or 3 why wait . My battery sizing might help too .
Vat free at the moment so a good time
WOW. You have installed and commissioned something I have been working on, with an almost identical equipment spec. Please, please, please can you give us a how to wire video! I am happy with the DC side; I have two-panel arrays each wired to a Victron MPPT unit supplying 3.6kW 48V DC to 4.8kW batteries and 5kW Victron inverter. But how do you wire the AC side? Is the inverter “AC In” also AC out? The unit has TWO “AC Out” connections are they used? Happy if we end up with a manual Grid disconnect for power out, but would love an automatic version.
I'd love to see a wiring diagram as well. I'm just about to install the same system but with a diy battery pack
It's all Optional from what I can tell. There's lots of victron example diagrams on the interweb. I'll do a wiring schematic at some point but just waiting for it to be finalised. Think I'll add some of my solar on the AC out side too at the next opportunity
@@EVPuzzle If you have loads (such as car charger) upstream of your victron then without an et112 it wont be aware of it and therefore wont dump the battery into your car. The video above shows what i’ve learnt - as you will recall i was confused about the different ways of wiring them and why you would do it one way over another
Exactly and as I've always told my installe the et112 is in the wrong place, I'll get thee eventually. Its actually good having this issue as it proves what needs to be done.
All the time I've looked at these systems the one common failing is an understanding about monitoring and CTs and their positions. Installers tend to focus on the physical wires and have little interest in the software. Sadly it's pretty critical stuff
@@EVPuzzle My solar is dc connected so nice and easy and interoperable. It may be more complicated with ac solar that doesn’t communicate with the victron directly (possibly multiple et112’s to monitor pv output and total draw from grid - i’m not sure as i dont have the issue)
I’m trying to get some quotes for a battery system but really really struggling to even get that as all supplies are so busy, any suggestions on that please?
Also do you know if we still need to get a DNO if we are just adding a battery, (to an existing solar system) I don’t want to export from the battery?
Thanks 😀
It's not whether you want to export its whether its capable of exporting.
As for quotes, keep trying, and look at other options not just local or established installers.
Yip. DNO needs to know. I’m in the middle of waiting for DNO reply. Whole process seems too complex for a setup that won’t export to the grid.
Where in the world are you? I might be able to help you.
Hi Nigel, I too would be interested in a video on how to calculate battery storage, currently taking daily winter usage of 15kw as my guide. Hope to get my G99 this month, only taken 3.5 months. No luck on getting a Smart Meter as we have a semi concealed gas meter (like all modern houses) Bulb says they can't take on these jobs at the moment. They won't do just the Elec. Meter. So it looks like I'll be unable to get a discounted tariff to go with our EV later this year. But on the bright side the DNO delay enables us to get a GivEnergy Hy 5 Gen 2 with a 3.6kw charge/discharge
Can I ask how you prioritise power distribution into the Eddie/battery?
Did you have to put an additional CT on the the battery connected back to the Eddie/Myenergi hub (pg 31 of Eddie manual)
Grid setpoint and export margin settings plus CT Clip position
Could you please let us know all the Victron parts used apart from the Multi, ET112 and Cerbo GX please? Thank you.
sorry, another question. do you need the Cerbo GX, what functions does it give you. Will the inverter work without the Cerbo, especially if running in lead acid mode. Thanks
Need is the key word.. Depends on what you want it to do. Just read up on the gx device to see if you need it
@@EVPuzzle It was more of a question as to does the inverter need the cerbo to work, rather me needing one for the data, lik the sunny boy storage "needs" the sunny home manager to work, it wont operate without it, the same a the Solaredge hybrid inverter needs the interface to operate.....
The sunny home manager is £500 and the solaredge interface is also roughly the same, its an additional cost to the system that you have to have in those cases.
@@anthonyevans7911 my understanding is that you need to have a GX device but the Cerbo is just one such device and there are others. You can also get a Multiplus-II with the GX device built in. There is a page on the Victron site describing the various GX devices so just search for “victron gx product range” and you’ll find it. I would post a link but sometimes that results in the comment being blocked on YT.
Is their a setup where you charge the battery at most 50% by the grid and 50% by solar?
Yes you can limit grid charging to a defined %
Great setup. Where did you source the server rack cabinet from? Do you have details on dimensions HxWxD?
Linxcom Leicester 600mm deep
I wonder if you have done any calculations for Solar v Additional battery storage (instead of the Solar panels)?
It must now be compared using the low 7.5p/Kwh 4 hour (12:30-04:30) using Octopus GO tariff.
How much can a UK home draw into batteries in those 4 hours?
Octopus uses 100% renewable supply, so green credentials OK.
As always thanks for sharing your experience Nigel. I would like to see how a video on the sizing of a battery storage system. Also, curious as to how your battery temperatures were / are in the current heatwave?
It's won't be long now, notes made, video to film...
Thank you for the update, great work again, Is the system still meeting all your needs, now April 2024?
Battery and energy wise yes it's comfortably covered all peak usage. The surprising thing has been how much automation has been possible helping with saving sessions . It's really pleasing to have a flexible interface to control the battery fully. Sadly some systems don't offer simple controls let alone advanced ones. Victron was a really good choice if I say so myself
Whats the reason for wanting to use shelves rather than the pylontech batteries rack ears and captive nuts?
Nothing to support the back of the pylontech
Do,you,have the facility in your set up to charge the batteries at the Octopus lower rate automatically? If so what is the mechanism you use?
Automatically as in timers yes but automatically on Agile is the cheap time slots change, I could if I wanted yes as the Octopus data is available in advance for the prices and charging could be controlled dynamically setting grid set point.
Currently the fixed period cheap tariff is easiest and best. Exporting intelligently is my quest for the future.. All Possible
A quick question how does the eddi integrate with victron ? I have a thermal store that is heated with the excess Solar can you dictate which takes the excess power first the eddi or the battery’s ? Thanks for the videos they are a great help !
Yes you can with ct position , grid set point on Victron and export margin on the zappi
Hi I am very interested in similar set up.But my knowledge and wife's worry of me doing the set up is a problem.Did you use a installer or set it up yourself?
Regards Colin
Installer. I told then what I wanted design wise though
Any chance they work near M3 jnt 4
Hi Nigel. I am about to install a solar panel system with Pylontech batteries. One question that comes to mind is whilst in your system you say you do not have to rely on the grid in the summer months as your energy comes from your panels, what about in the winter time when little power is coming from the panels? I assume you then have to export power from the grid to keep the batteries topped up. Is that correct?
Yes using octopus 🐙 GO which the best EV and solar friendly cheap rate energy tariff out there Imo. A couple of more expensive months in December and January are better than burning oil in the boiler
I thought u siad the vicktron inverter was not grid tied can u explain please
I'm interested in a sizing video I'm really interested in add battery's to home. Then I will look as solar later
Hi Nigel do all of your panels feed in to this system? If so would you not have considered applying for permission to get a 5kw or 7kw inverter? Or is there more involved in this ? Thanks enjoyed watching your video
Being AC connected my solar is completely seperate to my battery but they all interact. I did consider bigger inverter options or two smaller parallel inverters but felt this was optimum for us without going crazy. It was easy to get carried away
Hi, thanks for the system update. A question on your battery SOC monitoring. Does it take into account the depth of discharge (DOD) of the battery? For example, my battery may indicate it is 100% full, but with say, a DOD of 20%, it has a usable capacity of 80%. I scaled my monitoring system so that it reads more correctly, i.e 100% SOC = 100% usable and 20% SOC = 0% usable. It gives me a much better view of how much charge I have left.
For me 100% represents the voltage set for the charging to stop so my headroom isn't shown.
I prefer to see 10% as 10% . Not sure if I can calibrate it to show zero
Can you post a wiring schematic for yr system? thx
When complete
I was particularly interested in how you configure to control back feeding into the grid, like the powerwall does under a power outage?
Victron has multiple AC connections where other batteries has just the one. There's two inputs fur grid and shore power or generator for the marine market . Perfect for off grid but you can also connect av circuits to the AC out where it recognises protected circuits. In the event of a power failure the internal transfer switch flicks off isolating from the grid hence no back feeding is possible. The AC IN is disconnected but AC out stays working with the battery and everything on the out side.
Google Victron transfer switch and look at the diagrams, there's some very clear ones out there.
I'll be copying them to do my schematic
I think in a previous video you said you were concerned that you could not do I timed export with Victron. Is that the case, or have you been able to overcome this? Thanks
I can do a timed export I just need to code the automation. At present it's on a manual screen button
@@EVPuzzle Thanks Nigel. I'm also curious about how you manage to have such low peak grid usage. You have your entire house on the AC-Out of the MultiPlus and so the max capcity it can supply from battery only is (I believe) 4kW. On a cloudy day in winter when you have cooker, kettle, heating etc, surely you pull more than this? We certainly do!
Well trained to so one thing at a time but remember that's only relevant in a power cut situation. Victron peaks well above that of course for short bursts
Very informative thanks a ton ❤
Interesting video but I’m not sure what you mean about ramp up and down being a function of the battery. Surely this is the inverter? The current can flow in and out of the battery instantaneously by definition
Battery system I mean, yes it's the inverter controlling it
Thanks, Nigel for your video series. My Fox System is soon to be going in and I did a lot of work on the sizing. i don't want to size for the worst-case winter's day 16 kWh (excluding EV charging) but provide ESS to cover the base load and then some ie what I would need on an average spring/autumn day with my 4.8 kW PV. I'm happy to export during the day or charge my 10.5 kWh SunAmp Heat Battery (Heat Store for DHW) in summer and in winter and top up the ESS and Heat Store from off-peak EV tariff in the winter. The PV calculation is that it should meet 50% of my current annual consumption needs and I also have invested in Wind-Farm co-operative to meet the other 50%. The Windfarm element means it wouldn't pay me to eliminate Grid import as I need this to collect on the Wind-farm payout.
How noisy have you found the Victron Multiplus II?
Hi Nigel, interesting conversation. Did you get your Zappy not seeing your battery issue sorted? Also I was confused about your explanation of your consumer unit being all on AC out1 (the protected side of the Multiplus 2). My understanding is that the 50A capacity of the Multiplus 2 is total draw across AC out 1 and 2, and that the total draw of AC out 1 when the grid is offline is only 20A. can I assume that you have not had a power outage and tried to turn on multiple high voltage loads (eg cooker, water heater and aircon)? Take care D
I've not been bothered so far tbh. I know what I need to do though should it bother me going forwards.
Myenergi currently shows zero house use when the battery is covering the house load which is sort of reasonable. Only down is side is house usage values do not include battery use until the next day when battery charging counts as house use which is does as its either Grid or solar energy going into a device connected to the house.
One day I'll set it up as an exercise
Hi Nigel, thanks for the update, that was excellent, I keep on learning things from your videos. Do you think you would be willing and able to put up a wiring diagram of your system, showing every component including your solar panels. I would really love to see that. As for your next video, my thoughts on sizing are, we use between 8-10kw a day, so I want 30kwh of storage, in the hope that with what little solar we get in the winter, this capacity will get us though a cloudy 4-6 days, as I'm sure we will get some solar to either use directly or top up the batteries. Cheers Nige, keep up the excellent work.
Wow 30kwh that's really knocking grid use on the head
@@EVPuzzle Hopefully.
30KWH of Pylontech? Or something else?
@@gavinnoname1424 Hi Gavin. I've always liked the Givenergy batteries, they are the cheapest on the market and look much nicer than the Pylontech ones. I went to the Fully charged show and spoke with Givenergy who assured me they have sorted the ramp up/down issue. But to be honest I'm not that bothered. Nigel makes some good points about the Pylontech. 30kwh sounds a lot, but as I'm also going to install air to air heat pumps, multi head, x2, and a Mixergy tank, our electricity usage will go up significantly, so 30kwh won't be a crazy amount, and probably won't buy us as long as I'd like through the winter months.
@@HOMEAROMAS I am not too familiar with the Givenergy range but if I recall their batteries can only be used with their own inverter.
Have you considered doing a DIY battery?
I went down the route of purchasing 16x 280ah LifePo4 batteries and a BMS. Which cost £1,800 delivered.
This gives me a 13KWH battery for under £2K.
....or 26Kwh for £4K
In victron. Is solar used only for critical loads and not for AC loads?
I think I will go down the victron/pylontech route too. Does anyone know an installer that could do this in central Scotland?
Hi Andrew, I’m also based in central Scotland (near Dalry North Ayrshire) and will be doing a self-installation of Multiplus-II 5kVA and Pylontech 9.6kWh soon.
If you are competent with electrics then you can potentially install everything yourself and get it inspected by your local building control dept. Or you could get a general electrician to install the new circuit for the Multiplus but connect up the Multiplus yourself to the AC isolator and do all the DC stuff yourself.
That all said, even the DC side is very dangerous if you get it wrong so only consider any DIY work if you have relevant knowledge and experience. If you’re looking for a one-stop shop installer to do everything then a decent solar PV installer should have most of the skills needed even if they’ve not worked with batteries before. I expect they’ll be keen to expand their knowledge into ESS systems if they can find a willing guinea pig. :)
Unfortunately, finding a solar installer who isn’t booked out for the next 9 months is probably not easy right now. Before I decided to go down the Victron/Pylontech route, I got a quote for a Powerwall 2 and the earliest date was next March! That was a couple of months back so it’s probably worse now.
The other thing you’ll need to think about is getting DNO approval which will be easier or harder depending on whether you go for a 3.68kW G99 system. I’m currently trying to obtain G99 DNO approval from SP Energy Networks which seems to be a bit more challenging than with some other DNOs but I’ll get there! :)
HTH.
@@craigchamberlain Hi Craig,
Thanks for your response. I've been working with a victron/pylontech stockist who have been amazingly helpful; they can get the hardware though I'd probably have to go via a company to actually buy it. Unfortunately we're struggling to get an installer.
It sounds like we're looking at the same kit and in a similar position though you are further down the line so I'd really appreciate any steer on things.
Started to look at the G99 but got cold feet pretty quickly with it. I don't have electrical experience beyond changing electrical sockets and setting up my shed solar install 🙂 so might have to try to find a willing electrician or general PV installer.
If you would be ok to share your system design and g99 with me I'd really appreciate it though. I am mulling over the self install route. I have reached out to a PV installer to see if they might be interested too but suspect availability to be an issue.
Many thanks
Andrew
@@andrewp3648 sorry for the delay replying but unfortunately my G99 application has been put on the back-burner due to the ENA database not yet being updated to reflect the updated type testing certificate for the Multiplus-II 48/5000/70-50.
What I can tell you is that my DNO (SPEnergy) has said that my installation does NOT qualify for fast-track G99 because I am only installing a battery storage system and not a battery + PV installation. So I might change my application to include both as that is my end goal anyway. I was just trying to keep it simple.
I have also been told that it’s not a given that my system will be approved even though it’s only a 4.4kW inverter and G98 allows up to 3.68kW without requiring DNO permission in advance. Apparently the network is struggling to cope but frankly I file that under “not my problem” because DNOs should NOT be obstructing people like us who are spending large sums of our own money to provide distributed generation and battery storage which will ultimately help the grid.
Another frustration for me is that there seems to be a significant lag in email communications with SP Energy even to the point where they send out automated emails wondering why I’ve not responded to them even though I’ve sent two emails which have not been acknowledged yet. Then I phone in and talk to the agent and agree an approach only for them to read a belated email and take a different approach. So the result of this is that my application has been “archived” and I need to start again.
Anyway, I’ve got all my equipment now so I guess I’ll just have to play around “off-grid” until ENA get around to ticking the “compliant” box for the inverter and I can restart the DNO G99 application process.
Will keep in touch.
Hi Craig / Andrew, I know it’s been a while since you posted but I was wondering how you got on with your G99 application with SP?
I am in West Kilbride, North Ayrshire and have just submitted a G99 application. I want to add a 14.3kW Seplos battery pack and a Victron Multiplus 2 48/5000 inverter to my existing 3.6kW Solaredge / Eddi PV system.
I am now doubtful that SP will approve the 8kW combined output and, if approved, may require some limiting. From what I have read on other forums inverter limiting may need to be done by an installer as it should be password protected from the end user. Also it looks like the Solaredge 3680HD may not be G99 compliant. (It is G98 compliant).
I intend to diy install and try to find an Electrician or installer to do the necessary testing and BS paperwork required for final DNO sign off. Did you find someone to do that in the area to install / commission?
Waiting for SP to respond to application but not holding my breath.😳
Many thanks.
@@billgoldie3212 I have to admit that I ended up abandoning the victron route due to lack of a willing installer. Ended up going with givenergy in the end which wasn't quite what I wanted but is working fairly well so far
We now, at long last have our pylontech batteries and Victron multiplus. We are about to start installation. We notice that several people have asked for schematics of your system. Do you have any plans to do one, as it would be very helpful to us? Many thanks
Yep done one watch this space
@@EVPuzzle Thanks very much. Look forward to seeing it. Diane
Hi Nigel, another great video.... good to get the update on the previous battery installation video and it's great to hear that it is going so well.
Just preparing the G99 and ensuring I've got all the components I need for an almost identical install. Can I just check a couple of things with you, please?
- Somewhere (maybe in the comments?) you mentioned that the 100 amp mains cables won't fit directly into the inverter, due to cable sizes, I think. How did you overcome this?
- What is the purpose of including a lynx DC distributor and where have you integrated this into your system?
Thanks Nigel, keep up the great work. There are so many people who appreciate all that you're doing!
We used the consumer unit wiring which isn't so thick . Victron recommend splitting it into two cables rated 50a but we didn't need to in the end .
This is where sparky knowledge is key know cable ratings etc
As we had 5 batteries that meant two stacks as they go in 4s. Lynx enabled seperate cables and less heat in the cables ...I believe. Belt and braces
Do keep in mind that the Multiplus-ii 48/5000 is only rated for 50amps of throughput though.
Another requirement some users may have is location of a supplier. I live in SW London but there seem to be no local Victron product suppliers the nearest being in the Medway area (75 mins), Hampshire (60 mins) or Essex (90 mins). It has surprised me that in the south east (~20 million potential customers) there are just 4 suppliers. The midland and north have many suppliers and there even 2 in your neck of the woods. I wonder if this will have an impact on the availability of people available locally to help with an install.
Roll on winter to see how it performs. Brian
Yes I'm sort of looking forward to it. New heating changes should be in before winter too. Going to be interesting to see how it all plays out
Yeah it'll be interesting when winter comes around. I've got 2 x US3000C pylontech batteries which overnight drop to about 50%. I was contemplating 3 batteries but didn't think on the darker days they'll fill up. Had one dull day up here in York last week and it took best part of the day to fill. But, I've only had solar for a month now so still learning!
@@ahooks Winters are tough sometimes I produce negligible amount off electricity from my 2.8kWh system in December 0.2-0.3 kWh for whole day when in May my system produced 17kWh in best day . Need wind turbine for winter ;)
In the video channel by Will Prowse, he has created several videos in which he looks at how batteries in a stack discharge. Across the videos he seems to have compelling results that show without some thought, one of the batteries will charge/discharge more frequently which is likely to shorten the life of that battery. Have you done anything (do you need to do anything) with your stack to ensure the batteries are used equally. Or do you think its doesn't matter much?
That depends on the BMS and batteries in use. His videos are often using raw batteries and a seperate BMS and monitor. My system has this all built in, balancing occurs by default within the pylontech system where they are all connected together with dtaa cables not just power cables
Very interesting content, thanks.
A video on battery size would be very useful, having spent the last 6 months trying to get some quotes I’ve come to realise that DIY maybe the way forward (with the help of an electrician). G
That's the exact route I have gone.
Kit arrived recently and I have been testing with it, and have built up a good understanding of all the settings/connectivity/BMS/NodeRed/HomeAssistant.
Finding an installer who knows, or is prepared to install Victron has been hard. I think I found a solution through....I spoke to a sparky (friend of friend) who would like to make a move into energy storage, but he is in a catch22 as he doesn't have experience with battery/inverter, so would struggle to get customers.....and no ESS customers means no experience.
Anyway, I am hoping that between us we can have a low cost installation, and he can gain the experience(photos/casestudy for website)
Remember you need MCS certificate if you want to export and be paid under SEG
@@EVPuzzle I have no solar, so this will be redeploying Octopus 5p electricity during the day.
So think I should be OK with just G99. (Although happy for you to point out anything that u may be missing)
It would be good to help explain the sizing of the mppt compared to number of panels and the rate through to batteries