0:16 - 1:45 How to Build it 1:46 60 amp Load Test 3:41 Over Current Test 4:45 Over Voltage Test 6:56 Over Discharge Test 8:44 Conclusion and Things to think about when choosing a BMS for your system ~~~~~~~~~~~~~~~~~~~~~~~~~~~ Does off-grid solar confuse you? Check out my DIY friendly website for solar system packages and product recommendations, and so much more! www.mobile-solarpower.com Join our DIY solar community! #1 largest solar forum on the internet for beginners and professionals alike: www.diysolarforum.com Check out my best-selling, beginner-friendly 12V off-grid solar book (affiliate link): amzn.to/2Aj4dX4 If DIY is not for you, but you love solar and need an offgrid system, check out Tesla Solar. Low prices and great warranty, and they can take your entire house offgrid with their new Powerwalls: ts.la/william57509 ~~~~~~~~~~~~~~~~~~~~~~~~~ My solar equipment recommendations (Constantly updated! Check here first): 12V/48V Lithium Batteries: www.mobile-solarpower.com/solar-batteries.html Solar System Component Directory: www.mobile-solarpower.com/solarcomponents.html Plug-N-Play Systems: www.mobile-solarpower.com/full-size-systems.html Complete 48V System Kits: www.mobile-solarpower.com/complete-48v-solar-kits.html DIY Friendly Air Conditioner/ Heat Pumps: www.mobile-solarpower.com/solar-friendly-air-conditioners.html Complete 48V System Blueprint: www.mobile-solarpower.com/48v-complete-system-blueprint.html ~~~~~~~~~~~~~~~~~~~~~~~~~~ My Favorite Online Stores for DIY Solar and Coupon Codes: -Current Connected: SOK, Victron and High Quality Components. Best prices and warranty around: currentconnected.com/?ref=wp -Signature Solar: Cheap Server Rack Batteries and Large Solar Panels: www.signaturesolar.com/?ref=h-cvbzfahsek -Ecoflow Delta Official Site: My favorite plug-n-play solar generator: us.ecoflow.com/?aff=7 -AmpereTime: Cheapest 12V batteries around: amperetime.com/products/ampere-time-12v-100ah-lithium-lifepo4-battery?ref=h-cvbzfahsek -Rich Solar: Mega site and cheaper prices than renogy! Check them out: richsolar.com/?ref=h-cvbzfahsek -Shop Solar Kits: Huge site with every solar kit you can imagine! Check it out: shopsolarkits.com/?ref=will-p -Battery Hookup: Cheap cell deals bit.ly/2mIxSqt 10% off code: diysolar -Watts 24/7: Best deals on all-in-one solar power systems, with customer support and distribution here in the USA: watts247.com/?wpam_id=3 ~~~~~~~~~~~~~~~~~~~~~~~~~~~ Contact Information: I am NOT available for personal solar system consult! If you wish to contact me, this is my direct email: williamprowsediysolar@gmail.com Join the forum at diysolarforum.com/ if you wish to hang out with myself and others and talk about solar FTC Disclosure Statement and Disclaimers: Every video includes some form of paid promotion or sponsorship. Some links on this youtube channel may be affiliate links. We may get paid if you buy something or take an action after clicking one of these. My videos are for educational purposes only. Information is subject to change/update at any time. Electricity is DANGEROUS and can kill. Be smart and use common sense :) DIY Solar Power with Will Prowse is a participant in the Amazon Services LLC Associates Program, An affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com
Nice video ... the BMS is meant to get hot ...don't worry about it ..... Balancing only starts when fully charged , the BMS slightly discharges the cell which is full first so the others can catch up ... but this current is very small about 30mA , cells don't get out of step much ... so they must all be at the same level before you connect the BMS , so they start off balanced ... They often don't come from the factory at same charge level ... leave the cells in parallel for a day , then put in series and connect BMS
Hey man you seem to be pretty smart when it comes down to BMS can you help me out with trying to get mine hooked up my setup is a little bit different than the one I saw on your video
@@TimShedsworld I believe you can if it is an 8s BMS. My understanding is that you will be limited to 100c rate….Which is probably good because you do not want to charge any battery at full C rate.
I'm a 56 year old grandmother and find your videos and book on solar the easiest to understand I'm getting ready for my first build going to use it in my day tripper van.
If I had to pick out a favorite video, it'd be this one. I think it's because you did your usual teaching and also included a little experiment.. That was interesting.
I’ve watched your videos so many times, every solar forum I read I end up reading in your voice 😂 thanks for explaining things so well you’re now the default battery/solar voice in my brain
He was doing these types of vids in a RV and killing it. Now he's in a house, doing the same, rolling a Tesla, tearing open batteries and solar geneators. He just needed more room.
You have a great channel and website. No BS, straight to the point with a wealth of info, and a great personality backing it all up. I'm stil hoping for a vid on adapting van/rv system to charge at a tesla and ev station. :)
I was recently looking for a 50A 4s LifePO4 BMS and I saw these on Amazon, if I remember correctly. I never buy into waterproofing claims when it comes to PCBs. I steered away from these BMS because it made no sense to waterproof the BMS as all it does is cover it up and remove the BMS from the heat sink (in this case the ambient air). The case will cause the BMS to heat up abnormally high as the heat can't be adequately dissipated by into the air. Another item to clarify for the audience is that not all BMS have a balancing function. There is no point in balancing during discharge (with a non-regenerative balancer) and especially with LiFePO4 cells (as the cells will remain within a narrow range between 3.2V and 3.4V for a large portion of charge-discharge cycle) as all it does is reduce the useable energy of the battery; that is why most cheap BMS that have balancing function begin top balancing only when the individual cell voltage reaches 3.6V.
You have become my primary source for updating my knowledge of PV systems. In the 80s I ran a solar thermal research and manufacturing company. Question. What was the monitor you attached in parallel with the BMS. Simpler than app and bluetooth connection for a quick look. Keep up the good work. I think you've found your calling.
I imagine you get a ton of questions from people delving into this area but hoped you could enlighten me if you have time. I created a 3S24P 18650 battery to be used as a driveway wall lamp. I used a Daly 20A BMS but did not realize it was either that small nor using a non-standard BMS cable. As a result and in line with one of your other videos where you stated no negative repercussions exist for hooking multiple BMSs to a battery, I added a second 3S BMS cable. Attaching the first to the B0 (most negative) and on the positive side of each series set each subsequent cable (B1-B3 , Matching the Daly only ensuring I used separate a separate location on the nickel plated fuse sheets). Once complete I tested voltages reflecting a 4v jump per connection telling me it was connected properly. I then attempted to use the BG-8S attached to the newly created battery but it never powers on the unit. I assumed maybe the device was faulty and tested a prefab 3S commercial battery and it powered on properly and showed the state of each cell. What else could I be missing as I have run out of options. Sorry for the lengthy post but I wanted to be as concise as possible. Thank you for your time and your videos I find them very helpful.
You Are Getting Good At Teaching Us Your Craft! Nice Video! Keep Up The Good Work! Lithium Ion And Solar Are The Wave Of The Future For Prepping And Camping. Next Step Is Like Hybrid Solar For Northern Residential! I Think That Is The Next Step For A Viable Hybrid Solar/Inverter Propane Gas Generator System, You Know For Cloudy Rainy Northwest Climits. And Long Winter Nights! Again Great Video!
Always love your videos. Your are my go to guy for anything solar and I really appreciate you unbiased testing of everything. I learn something new everytime.... keep em coming....
Will, I am using these on 40 Toshiba LTO SCIB batteries using 24S because I don't have to worry about low temperatures. I initially started with 15 batteries and Daly BMS'S I purchased direct from Daly and they were shipped to me in 8 days. Very fast shipping from China. I just ordered 25 more a month ago and got them in 7 days. The initial 15 have worked flawlessly in keeping the cells balanced. I can see no reason to use any other brand for LTO batteries.
Thanks...just picked up one of these to use on an old 16S ebike Headway pack, to be repurposed as a 4S4P trolling motor battery. Should be straightforward.
I am running two 24 volt LiFePo4 battery banks with two 320amp BMS’. We have it up and running. The only thing of concern is on the Ant BMS app one bank shows different SOC than the other. Like 93% and other bank might show like 26% or 37% SOC. Both banks showing around same voltage. I’m running solar charging. System seems to operating ok. Don
Thank you for your review Will. I purchased a battery box built to hold a trolling motor battery and have been looking for a the proper device for battery protection. (4s 100a LiFePo4 Winston) Thanks to your video, I have found it. Already purchased and delivered. Can't wait to hook it up and test.
watched some videos and recognized sometimes some errors, for example in this video: @ 3:24 The wires are getting warmer => resistance increases => that doesnt mean that also the current increases. The current decreases with an increasing resistor!
@@WillProwse Ciao Will ! I have been there for 6 years in a fiberglass cabinet for electrical systems, they are at 2980 meters above sea level in a mountain bivouac with 2 x 200W panels, even the temperature has fallen below -28 ° C during some nights of January, do not give up, those who sold them guaranteed up to -25 ° C, put them in the freezer up to -32 ° C and still went with reduced capacity but loaded, the Winston itself gives it for -45 ° C
if I am not wrong, I guess it work fine without the charge controller. using the solar PV panel connected to one dc-dc regulator CC CV and feed the battery (to charge it). and the load discharge direct from the battery.
Hi, i have a question for you. i have 2 identical li-ion battery back, each one have it's own bms that can handle 40A. Can i connect the 2 pack in parallel to have a 80A total output? Will it work or i will have problems?
I have been looking at that particular BMS for a portable battery for use with ham radio equipment. The biggest concern is RFI some of these devices produce. Do you have any guidance? Are these quiet? You might want to add a RFI test to your repertoire. You could set up a $150 spectrum analyzer with an antenna and just do a quick scan. This would expand your audience to the ham community.
LOL....I was born and raised in San Diego. Never say never about the cold friend. I remember back in 87 when we got 3 inches of snow in the Santee/Lakeside area. I remember Ice floating by the OB Pier in 83. North Island Bridge Frosting over in 86. Also, remember that California actually gets more annual snowfall than Colorado ;) Better to be safe than sorry, for a just a few dollars more the system can be protected from cold/heat (You teach this) and it may well be an unexpected benefit from time to time :D Great info...would be curious how it performs 6 months to a year from now.
@@WillProwse It is rare and spectacular :D The weather has been fishy in SoCal for well over a decade now, but it will return, or so I believe ;) Better to be prepared, because I also recall 90+ degrees back in the late 70's on Christmas Day in the Clairemont area with the Santana winds. that was the start of the draught that lasted into the early 80's :P
Hi Will! Would you consider doing a video (or including in your solar book) a minimal solar setup where someone can run a window air conditioner for a short period of time (like an hour or two)? I have a pet and if I am away and the power goes out, I need an emergency setup where an air conditioner will run long enough for me to get back to the RV and rescue my pet to a cooler environment. The Kodiak is an excellent setup, but it is just under the Amp allowance for a small window unit so I am having to go a homemade route. I am sure there are many people who live in RVs who would benefit from this information. The big issue for me is finding/matching the proper soft start a/c with proper amps for the battery size/type. I wish for between a 10,000 and 13,000 BTU window unit, but perhaps an 8,000 is the max? Not sure. I do not think one would need 1,000 watts to charge a battery for rare emergency use - perhaps as low as 200 watts? I understand an additional setup of a notification system and a digital thermometer 120v plug is in order, but I do not request that part unless you wish (it would be nice if you did, at least in your book). If you are able to find an a/c that could run on the Kodiak for at least an hour, then problem solved super quick! Thanks much. p.s. I like how you and your channel have grown. You have become a helpful, nice guy. :-)
Hi Will, Thanks big time for all your videos! You have truly given me an education on Lithium Ion Batteries. I recently tore apart a 12V 100AH battery to reconfigured the cells into a slim battery. I numbered all the wires of the BMS and reconnected them exactly the way they were. When I measure the voltage at the battery terminals I get 13.5 volts. When I measure using the + battery terminal and the - BMS wire I get 2.4 volts. Could use some HELP ! Thanks! Don
In the first couple minutes of the video I had a question about the amp usage of the heat gun. The heat gun uses about 12 amps how does your meter come up with 60 amps? 60 amps DC ?
Got one of these a few weeks ago and didn't know it did any sort of active balancing til the other day. Never charged it up to 3.6v per cell for any balancing to take place (my assumption), but a week later of monitoring the new battery pack I find that the cells are 0.004 max difference. These metallic red covered BMS/balancers are great. I just finished building a clone of that battery pack tonight but used an HX-4S-F100A, which I'm now totally regretting.
@@LFPSair Have you confirmed this personally as well? I fast charged the pack to confirm it worked (one cell group begins to go up rapidly at 13.9v) and it shut it off. I was using an ISDT hobby charger though, so I can't confirm what Will showed (not borking his solar charge controller). I'd like to run one on my big LIFEPO4 pack in the back of my truck but it's even more sensitive due to used cells. I'd rather not fry my charge controller, and with my ISDT charger it completely halts all charging. Will's experience was different, and I can't understand how.
I believed it does the top balancing at 3.6v only. I also noticed that it is very close to the cutoff voltage too. My charger will cycle between on and off once every a few minutes. Now I only do the bottom balancing manually, and shut off the charge at about 3.4v
Hey Brandon. I really want to buy one of these BMS’s. I however have a 15S battery, so my only option would be to use the 16S model. The one question I have though, is if it will work on a 15S battery if I leave the 16S balance lead off/loose.
Re: BMS choices: QUESTION: Is that a common pole BMS, or A separate pole BMS. I like the idea of this way of protecting battery as I study more for my 1st ever DIY 24v LifePO4 project. I need to study my BMS options a little more before purchase that part. I think I will go with the Daly brand S8 ...8 connection to each 3.2v battery cell.
In short. What do you think is the future? Solar is great. Ultra capacitors are really cool. Very cool. Make a bit of money. You are the future. Thanks, man 😁
Lithium titanate batteries. Working on my first battery right now. 20,000 charge cycles. Should last longer than I will be alive. Video will be up in a month or so.
Hello Will thanks a lot for your great videos. In this video at 11:13 you've mentioned that's possible to run more than 1 BMS in parallel for the same battery (even if the wiring will be more complex). My problem is that the new high capacity LiFePO4 with 304AH are able to deliver between 250-300A current to drive a 3000W inverter continually. But to find a BMS with 250-300A which is affordable is a big problem they cost e.g. between $180 (250A) and $280 (300A). So for a 4s 12V setup with these 304AH batteries it would increase the cost a lot. I think about using 3 of this cheap 4s 12V 100A BMS in parallel. But I wonder what about running 3 balancer in parallel and even more what about the over/under current protection shut-off of 3 BMS in parallel if they are not synced? It would be great if you could comment about this question. I'm sure many other will have the same question with this new high capacity batteries. Frank
I was trying to decide on whether or not to use a BMS. I assume any BMS will have a current drain on each cell to achieve balancing. My voltage regulator limits charging voltage to 14.5v. On a 12v 4 cell LIFEPO4 battery, I think I can get by with 4 x 330 OHM resistors as a voltage divider between cells, which will have a 10ma drain and passively balance each cell to the same voltage.
I am going to install this BMS to 4S in 7 packages and then connect them together paralell for a 12V system. I dont see any worries about this exept for the safety issues of course. I have an Inverter 230/3000/12. I think that a discharge of 60A for each 4S will function. Any thing I should reconsider?
Have you considered adding a FLIR type infrared thermography camera to your test kit? I ask because while all of your electrical data are gathered precisely, but your thermal data is gathered by touching components. Even a cheap IOS or android thermography camera will give you and your audience a much more accurate data set than your fingers. You'll be able to analyze the entire system thermally all at once with an image / video that looks super cool (so to speak) Anyway, great channel and great reviews. Keep up the good work!
thanks for this great tutorial, i know there is a difference between chargers for Li-ion and LiFePo, so my question: is there a difference between bms for the Li-ion and LiFePo batteries ???
Will thanks for your efforts in getting all of us on board. Question I have set up a 4s12V Daly BMS on 4 -280Ah cells. BMS will not let the attached inverter function. Do I need to “jump start” the BMS with a short burst of charge current from a 12V charger?
IMPORTANT QUESTION: I like that BMS Daly you show. looks like heavy duty. So I used link and they said Common Port and Separate Port. Which one are you using and what is the different ? Thanks very much ! Looks forward to your answer so I can buy right one. Question 2: Do you think the BMS 100 Amp Black and blue wire is bigger Than the 60-80 Amp BMS ? because I want to make 12v with that LifePo4 3.2v 50amp Blue batteries. Want to start the Honda Odyssey minivan v6 3.6L or Toyota Camry v6. Thanks
I remember reading of someone that used a version of these designed for a Chevy volt battery that killed the battery after an overcharge. You really need to test this stuff and not rely on seller information or datasheets. 2.5V is also low for cut-off. The cells will form lithium needle microshorts and then dendrites doing that often, and can then overheat when recharging. You always want a BMS with battery temperature sensing for this reason, I'm pretty sure there's a version of that BMS that comes with a temp sensor.
The voltage specifications for this BMS are perfect for lithium iron phosphate and no other cell chemistry. I can't imagine somebody using the wrong BMS for the wrong chemistry. That would just be a horrible idea
@@WillProwse The person had these same BMS specifically programmed for Chevy volt batteries at the factory, and had no problems with most of them. Always test a BMS like you did before putting it into service. It may only take a poor or corroded connector to increase resistance for the BMS to get a false voltage reading and allow the batteries to overcharge.
Legendary videos! I checked the BMS and it says in the datasheet "over discharge detect voltage at 2.2V" - which I think is too low, isn't it? Will's BMS cut off at 2.5V with an over discharge protection. I don't want to destroy my cells...
How to know how big needs to be the bms in A? The maximum output of my batteries or the maximum consume of my appliances? I am confuse :( my diy battery is 48v 50Ah - 54Ah and sometimes my appliances are going to consume a peak of 4000w a few seconds. I hope any bms can be use in parallel when I make a second battery in the future >.
I first soldered the P-, B-, C- onto the battery. I continued hooking up the balance wires in the correct slots but in random order, then i noticed little smokes were coming out of the bms, but the battery pack were fine. Is there a pattern to install the wires from the BMS to the battery? I’m trying to find out what I did wrong. Unless it was a defective bms.
Thanks for the video! Is there a version of this for a 400ah sinopopy bank with 2000w inverter and corresponding loads? I need low temp charge cutoff protection too! Trying to work with an existing setup that doesn’t currently have any BMS installed. Thanks!
I have wondered about the BMS, disconnecting from the controller, I thought about putting a resistor bypassing the BMS to controller, like 100watt, 10 ohm or something, just enough to keep some power on the controller, but in most cases, the controller is cheaper than the battery, and your house, if it is burned from over charged lithium batteries,
I have an outboard motor on a boat that needs 200-300 amps to crank for 3-5 seconds at a time. Start up several times in a day, then 30amps continuous for the rest of the day. What Daly BMS would be the best to buy?
I for now charge without bms, its kinda spooky starting out, I try to stay at 4v per cell, and looking in to a high voltage disconnect, for controller only, I also have a low volt disconnect in the works , just incase the BMS fails,
Hi there nice video but could u use a battery tester to see how many cold cranking amps , your battery delivers, I was just wondering like how much cranking amps can this battery deliver
Hi, Will. Have you experienced a BMS low voltage disconnect and then the BMS won't reconnect when cell voltages recover? I'm using the Delgreen 4S 100A PCM/PCB/BMS. Thank you.
been watching a lot of your vids, if i build 2 sets of 12 volt battery's using 4-3.2 volt cells, could i charge 2 of these with one 4s 60 amp bms or do i have to disconnect one pack and hook it up to the other pack, or can they be charged together some how as one large pack
MrWill, I have purchased a Dale 200 amp 16 S their English manual would probably be easier to understand in Chinese. My question is this I’m setting up my batteries I want to charge them in smaller configurations at first. Can I use a Daly 16 S on four LiFeP04 cells at a time, thanks for your Informative postings!
I see your channel's name is "DIY Solar Power with Will Prowse"...have you considered other Solar Power Energy Harnessing Applications? Such as Solar Ovens ? Solar Water Heaters, etc. and also maybe some Physics behind Solar Power for those that are interested in the Science behind Solar Energy. Lastly maybe some predictions as to your thoughts on the future and where Solar Power / Batteries are headed. like in Graphene Batteries etc.... no Doubt Solar Energy Harnessing is our future, the path that we take going down that road is yet another matter entirely...thnxx for the info, you are quickly becoming the Solar Energy Source on TH-cam....
Hello, Great videos I have watched most of them. I actually was looking for a new BMS and found this one online and thought about it. I have just bought some Miady 36ah batteries and was thinking the BMS needs an upgrade. Currently, they just have a tiny little non-heatsinked one that sells for about $4. Would be great to see maybe a video taking the cheap Miady cells and replacing the BMS or combining them in a new box with a new BMS.
So the Miady batteries really overheat during load to the point they melted and weren't safe. I think the cells are okay but thinking of making a better battery from them with a new BMS and some cooling. I need to be able to drawn 35amps continuously peek but generally 5-20amp.
Very useful video, thank you. If you’re building a battery with new cells and a bms like this one. Do you need to bottom balance the cells like you would on used cells or just let the bms do the job?
i have 8 of those batteries in this video i want to wire them 12v with max amperage could do you have a video on how to wire 3,2v cells in series and parralel to do this cheers from Australia
Hi, I have a question regarding BMS and MPPT SCC, the issue about the BMS high voltage disconnect which could damage the SCC while charging, what was your thoughts on this?
So I'm looking to build a LiFePo4 battery for a dual Battery setup in my 4wd, just a quick question if I was to charge a battery set up like this with a DC DC charger how would I stop it from going into an over voltage situation? Would the dcdc charger disconnect it's self before the BMS trips?
Hi Will! Excellent videos! I would like to use 2p8s installation with one BMS, but what you say about using only 1 BMS? Could you recommend what kind of setup I could use to build roughly 400ah system? Problem is that I could not find any 400ah cells and 320ah is little bit too small for my application. Thank you!
What happens if you don't use a Bms? in a similar system (I understand that the problem is that the cells don't load the same) But is there any other complication? I want to use a high consumption system for an automotive audio system about 1200 amps and there is no such a large BMS for this
Hi Will, Great video 👍 Do you think it's possible to build batteries with these BMS on each battery and then parallel these batteries together to increase capacity?
I have a 12V 4 cell 200Ahr LiFePo4 Prismatic battery I got from BLS. And the BMS is the DALY 200A. I got it all hooked up then tested it out and it ran the 12V fan only a few minutes and it stopped. I checked the battery, all the connections and balance leads and everything is just fine, but the BMS won't complete the connection. What do I need to check? Cell Voltages: 1 - 3.284 2 - 3.274 3 - 3.275 4 - 3.273
I have a question sort of related to this. My Liitkala 150ah battery showed 0 v when doing maintenance charging. I couldn’t get any of the boost procedures to work so I took the battery apart and found that it had 12.9v in the battery pack. I bought a new Liitokala BMS and now it has 6.4 v at the terminals and my lithium charger still won’t charge it(still has 12.9v from the battery pack to the BMS). Bad BMS or other problem? The new BMS was a mirror image of the old one but I noticed that and wired accordingly. Thank you After reading many internet sites I finally decided to test the b1 b2 b3 b4 voltages and found that they were descending from b1 12.8v to b4 3.2v. I thought that the bms worked by reading the voltage of each battery then adjusting the charge. This is not the case. It analyzes the total voltage starting at 3.2v at b1 and growing to the 12.8v at b4, adjusting the charge of each cell by the variance of each from the expected accumulation of the cells. Since the replacement bms was a mirror image of the original, I had the cells wired backwards in order.
I bought a daly BMS and 4 lifepo4 cells from China, if i connect the BMS to the cells, is it necessary to bottom balance the cells or will the BMS take care of balancing the cells? If i set my mppt to only (de)charge between 20-80% do i have to worry that i didnt bottom balance the cells?
Hi.i bought a similar like this- with a 30A discharge current, and 15A charge current.. my question is what does 15A charge current mean? I checked mmpt charging current exceeds at 21A at noontime.. what does 15A BMS charging Current mean then, does it mean- it limits 15A only?
I'd love to see your most cost effective solution to incorporate a solar MPPT controller with a li-ion battery and then a DC-DC charger in one system. I know you don't like it, but it's something I'm designing in my RAV4 hybrid build as the 90W panel on the roof rack won't have enough juice to charge my lithium house battery...so car charging will be a necessity and I don't want to have to charge off solar, then manually disconnect it and connect the DC-DC charger. Something automated would be wonderful!
hello.. i need to ask...if the inverter overcurrent, will the BMS also stop the current between battery and MPPT charger ? then, if the battery fully charged, will the BMS also stop the current to inverter ? because i'm afraid if BMS stop all the current, it will damage the MPPT charger or solar panel. if so, i plan to bypass from MPPT directly to battery
Hi. Thanks for the videos. If I want to connect that bms battery pack in parallel with another identical bms battery pack to get 80 amps. Do I need an extra BMS that manage these 2 ones? Or the BMS are only for series systems?
0:16 - 1:45 How to Build it
1:46 60 amp Load Test
3:41 Over Current Test
4:45 Over Voltage Test
6:56 Over Discharge Test
8:44 Conclusion and Things to think about when choosing a BMS for your system
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Nice video ... the BMS is meant to get hot ...don't worry about it ..... Balancing only starts when fully charged , the BMS slightly discharges the cell which is full first so the others can catch up ... but this current is very small about 30mA , cells don't get out of step much ... so they must all be at the same level before you connect the BMS , so they start off balanced ... They often don't come from the factory at same charge level ... leave the cells in parallel for a day , then put in series and connect BMS
Hey man you seem to be pretty smart when it comes down to BMS can you help me out with trying to get mine hooked up my setup is a little bit different than the one I saw on your video
Hi, I have the Daly 12v 100amh bluetooth bms, can I use it for a 12v 200amh lifepo4 8 cell battery
@@TimShedsworld I believe you can if it is an 8s BMS. My understanding is that you will be limited to 100c rate….Which is probably good because you do not want to charge any battery at full C rate.
I'm a 56 year old grandmother and find your videos and book on solar the easiest to understand I'm getting ready for my first build going to use it in my day tripper van.
I'm 51 next month and agree.
Will should be teaching at a Tech college.
I'm 78.
If I had to pick out a favorite video, it'd be this one. I think it's because you did your usual teaching and also included a little experiment.. That was interesting.
I’ve watched your videos so many times, every solar forum I read I end up reading in your voice 😂 thanks for explaining things so well you’re now the default battery/solar voice in my brain
He was doing these types of vids in a RV and killing it. Now he's in a house, doing the same, rolling a Tesla, tearing open batteries and solar geneators.
He just needed more room.
That's building a business for ya!
You have a great channel and website. No BS, straight to the point with a wealth of info, and a great personality backing it all up.
I'm stil hoping for a vid on adapting van/rv system to charge at a tesla and ev station. :)
You are SO interesting to watch! You are an incredible teacher...very talented at explaining complex systems. Thanks for your videos.
I mean i dont get it fully yet either but a complex system is Something different...
I was recently looking for a 50A 4s LifePO4 BMS and I saw these on Amazon, if I remember correctly. I never buy into waterproofing claims when it comes to PCBs. I steered away from these BMS because it made no sense to waterproof the BMS as all it does is cover it up and remove the BMS from the heat sink (in this case the ambient air). The case will cause the BMS to heat up abnormally high as the heat can't be adequately dissipated by into the air. Another item to clarify for the audience is that not all BMS have a balancing function. There is no point in balancing during discharge (with a non-regenerative balancer) and especially with LiFePO4 cells (as the cells will remain within a narrow range between 3.2V and 3.4V for a large portion of charge-discharge cycle) as all it does is reduce the useable energy of the battery; that is why most cheap BMS that have balancing function begin top balancing only when the individual cell voltage reaches 3.6V.
Positronium good info.
You have become my primary source for updating my knowledge of PV systems. In the 80s I ran a solar thermal research and manufacturing company. Question. What was the monitor you attached in parallel with the BMS. Simpler than app and bluetooth connection for a quick look. Keep up the good work. I think you've found your calling.
I learned a lot from this video; a well done hands-on practical demonstration of what you have been teaching us.
I imagine you get a ton of questions from people delving into this area but hoped you could enlighten me if you have time. I created a 3S24P 18650 battery to be used as a driveway wall lamp. I used a Daly 20A BMS but did not realize it was either that small nor using a non-standard BMS cable. As a result and in line with one of your other videos where you stated no negative repercussions exist for hooking multiple BMSs to a battery, I added a second 3S BMS cable. Attaching the first to the B0 (most negative) and on the positive side of each series set each subsequent cable (B1-B3 , Matching the Daly only ensuring I used separate a separate location on the nickel plated fuse sheets). Once complete I tested voltages reflecting a 4v jump per connection telling me it was connected properly. I then attempted to use the BG-8S attached to the newly created battery but it never powers on the unit. I assumed maybe the device was faulty and tested a prefab 3S commercial battery and it powered on properly and showed the state of each cell. What else could I be missing as I have run out of options. Sorry for the lengthy post but I wanted to be as concise as possible. Thank you for your time and your videos I find them very helpful.
You Are Getting Good At Teaching Us Your Craft! Nice Video! Keep Up The Good Work! Lithium Ion And Solar Are The Wave Of The Future For Prepping And Camping. Next Step Is Like Hybrid Solar For Northern Residential! I Think That Is The Next Step For A Viable Hybrid Solar/Inverter Propane Gas Generator System, You Know For Cloudy Rainy Northwest Climits. And Long Winter Nights! Again Great Video!
Bingo!
Always love your videos. Your are my go to guy for anything solar and I really appreciate you unbiased testing of everything. I learn something new everytime.... keep em coming....
Will, I am using these on 40 Toshiba LTO SCIB batteries using 24S because I don't have to worry about low temperatures. I initially started with 15 batteries and Daly BMS'S I purchased direct from Daly and they were shipped to me in 8 days. Very fast shipping from China. I just ordered 25 more a month ago and got them in 7 days. The initial 15 have worked flawlessly in keeping the cells balanced. I can see no reason to use any other brand for LTO batteries.
I actually like all of your videos before I even watch them at this point. Thanks Will! I know I can count on you to accurately test hardware!
Thanks man!! :D
"this Is when science is fun" legend
Thanks...just picked up one of these to use on an old 16S ebike Headway pack, to be repurposed as a 4S4P trolling motor battery. Should be straightforward.
Hooked it up and top balanced my Headways nicely over night. This works...
Great video (a year later), do you know what BMS could enable a lithium battery pack to work as a Lead Acid drop-in replacement?
I am running two 24 volt LiFePo4 battery banks with two 320amp BMS’. We have it up and running. The only thing of concern is on the Ant BMS app one bank shows different SOC than the other. Like 93% and other bank might show like 26% or 37% SOC. Both banks showing around same voltage. I’m running solar charging. System seems to operating ok.
Don
Thank you for your review Will. I purchased a battery box built to hold a trolling motor battery and have been looking for a the proper device for battery protection. (4s 100a LiFePo4 Winston) Thanks to your video, I have found it. Already purchased and delivered. Can't wait to hook it up and test.
Worked well on my 4s4p headway pack..
Got a tempeture gun to point at the wires and connections more scientific and thermal imaging is fun stuff
watched some videos and recognized sometimes some errors, for example in this video: @ 3:24
The wires are getting warmer => resistance increases => that doesnt mean that also the current increases.
The current decreases with an increasing resistor!
The current is increasing because voltage is decreasing and we are pulling same wattage. So current goes up
Thanks for the test, I have Winston LiFePo4 batteries, charged at -18 ° celsius in winter, no problem for 6 years!
That's impossible
@@WillProwse Ciao Will !
I have been there for 6 years in a fiberglass cabinet for electrical systems, they are at 2980 meters above sea level in a mountain bivouac with 2 x 200W panels, even the temperature has fallen below -28 ° C during some nights of January, do not give up, those who sold them guaranteed up to -25 ° C, put them in the freezer up to -32 ° C and still went with reduced capacity but loaded, the Winston itself gives it for -45 ° C
if I am not wrong, I guess it work fine without the charge controller. using the solar PV panel connected to one dc-dc regulator CC CV and feed the battery (to charge it). and the load discharge direct from the battery.
What happens after over current protection kicks in? Does it take a few seconds and then turn back on??
Whats the difference between common version or separate version BMS
I just purchased two 80 A and it comes equipped with fan and BT temperature sensor.
Hi, i have a question for you. i have 2 identical li-ion battery back, each one have it's own bms that can handle 40A. Can i connect the 2 pack in parallel to have a 80A total output? Will it work or i will have problems?
I have been looking at that particular BMS for a portable battery for use with ham radio equipment. The biggest concern is RFI some of these devices produce. Do you have any guidance? Are these quiet?
You might want to add a RFI test to your repertoire. You could set up a $150 spectrum analyzer with an antenna and just do a quick scan. This would expand your audience to the ham community.
LOL....I was born and raised in San Diego. Never say never about the cold friend. I remember back in 87 when we got 3 inches of snow in the Santee/Lakeside area. I remember Ice floating by the OB Pier in 83. North Island Bridge Frosting over in 86. Also, remember that California actually gets more annual snowfall than Colorado ;)
Better to be safe than sorry, for a just a few dollars more the system can be protected from cold/heat (You teach this) and it may well be an unexpected benefit from time to time :D
Great info...would be curious how it performs 6 months to a year from now.
Wow that's crazy! I can't imagine that haha
@@WillProwse It is rare and spectacular :D
The weather has been fishy in SoCal for well over a decade now, but it will return, or so I believe ;)
Better to be prepared, because I also recall 90+ degrees back in the late 70's on Christmas Day in the Clairemont area with the Santana winds. that was the start of the draught that lasted into the early 80's :P
The Sarge knows.
Thank You love to watch and learn from you.
Will, you need an infrared thermometer so you can show us how warm the components get.
Hi Will!
Would you consider doing a video (or including in your solar book) a minimal solar setup where someone can run a window air conditioner for a short period of time (like an hour or two)? I have a pet and if I am away and the power goes out, I need an emergency setup where an air conditioner will run long enough for me to get back to the RV and rescue my pet to a cooler environment. The Kodiak is an excellent setup, but it is just under the Amp allowance for a small window unit so I am having to go a homemade route. I am sure there are many people who live in RVs who would benefit from this information. The big issue for me is finding/matching the proper soft start a/c with proper amps for the battery size/type. I wish for between a 10,000 and 13,000 BTU window unit, but perhaps an 8,000 is the max? Not sure. I do not think one would need 1,000 watts to charge a battery for rare emergency use - perhaps as low as 200 watts? I understand an additional setup of a notification system and a digital thermometer 120v plug is in order, but I do not request that part unless you wish (it would be nice if you did, at least in your book).
If you are able to find an a/c that could run on the Kodiak for at least an hour, then problem solved super quick!
Thanks much.
p.s. I like how you and your channel have grown. You have become a helpful, nice guy. :-)
I also just purchased your book. Awesome. Thank you for you solar videos. I will be adding more to my RV
Hi Will,
Thanks big time for all your videos! You have truly given me an education on Lithium Ion Batteries. I recently tore apart a 12V 100AH battery to reconfigured the cells into a slim battery. I numbered all the wires of the BMS and reconnected them exactly the way they were.
When I measure the voltage at the battery terminals I get 13.5 volts. When I measure using the + battery terminal and the - BMS wire I get 2.4 volts. Could use some HELP !
Thanks!
Don
Will, you're an information beast! ty for the great videos and information.
In the first couple minutes of the video I had a question about the amp usage of the heat gun.
The heat gun uses about 12 amps how does your meter come up with 60 amps?
60 amps DC ?
Got one of these a few weeks ago and didn't know it did any sort of active balancing til the other day. Never charged it up to 3.6v per cell for any balancing to take place (my assumption), but a week later of monitoring the new battery pack I find that the cells are 0.004 max difference. These metallic red covered BMS/balancers are great. I just finished building a clone of that battery pack tonight but used an HX-4S-F100A, which I'm now totally regretting.
Brandon Kennedy
I am pondering this 3.6v on spec too. Do not know how it does that.
@@LFPSair Have you confirmed this personally as well? I fast charged the pack to confirm it worked (one cell group begins to go up rapidly at 13.9v) and it shut it off. I was using an ISDT hobby charger though, so I can't confirm what Will showed (not borking his solar charge controller). I'd like to run one on my big LIFEPO4 pack in the back of my truck but it's even more sensitive due to used cells. I'd rather not fry my charge controller, and with my ISDT charger it completely halts all charging. Will's experience was different, and I can't understand how.
I believed it does the top balancing at 3.6v only. I also noticed that it is very close to the cutoff voltage too. My charger will cycle between on and off once every a few minutes. Now I only do the bottom balancing manually, and shut off the charge at about 3.4v
Hey Brandon. I really want to buy one of these BMS’s. I however have a 15S battery, so my only option would be to use the 16S model. The one question I have though, is if it will work on a 15S battery if I leave the 16S balance lead off/loose.
@@Tranquilitarian No. Daly BMSs expect all cells to be present. If it doesn't detect voltage on a balance wire, it fail safes- ie doesn't work.
Re: BMS choices: QUESTION: Is that a common pole BMS, or A separate pole BMS. I like the idea of this way of protecting battery as I study more for my 1st ever DIY 24v LifePO4 project. I need to study my BMS options a little more before purchase that part. I think I will go with the Daly brand S8 ...8 connection to each 3.2v battery cell.
In short. What do you think is the future? Solar is great. Ultra capacitors are really cool. Very cool. Make a bit of money. You are the future. Thanks, man 😁
Lithium titanate batteries. Working on my first battery right now. 20,000 charge cycles. Should last longer than I will be alive. Video will be up in a month or so.
@@WillProwse .. Probably a stupid question. Did you pass the mensa test? I did in 89.
Hello Will
thanks a lot for your great videos. In this video at 11:13 you've mentioned that's possible to run more than 1 BMS in parallel for the same battery (even if the wiring will be more complex). My problem is that the new high capacity LiFePO4 with 304AH are able to deliver between 250-300A current to drive a 3000W inverter continually. But to find a BMS with 250-300A which is affordable is a big problem they cost e.g. between $180 (250A) and $280 (300A). So for a 4s 12V setup with these 304AH batteries it would increase the cost a lot. I think about using 3 of this cheap 4s 12V 100A BMS in parallel.
But I wonder what about running 3 balancer in parallel and even more what about the over/under current protection shut-off of 3 BMS in parallel if they are not synced? It would be great if you could comment about this question. I'm sure many other will have the same question with this new high capacity batteries.
Frank
Hi, I'm looking for a BMS with bluetooth with separate ports and I can't find it, can you recommend one? Thanks ..
Could you please post a video testing a separate port bms
Graet video!
what voltage does the battery have after charging, i have lifepo4 4s, 3.2v 100ah, after charging the battery is 13.4v.
Thanks
What to do with extra solar energy after batteries are loaded? Do you ever consider a “ Grid tie inverter” to unload the excess into the home system?
I was trying to decide on whether or not to use a BMS. I assume any BMS will have a current drain on each cell to achieve balancing. My voltage regulator limits charging voltage to 14.5v. On a 12v 4 cell LIFEPO4 battery, I think I can get by with 4 x 330 OHM resistors as a voltage divider between cells, which will have a 10ma drain and passively balance each cell to the same voltage.
I have Deligreen BMS 10s 15 A and it not have balance curent. But writen on it "with balance".
For some reasons I can't see the video but the sound is clear. Other TH-cam videos are viewable.
Does Low temperature detection matter with other Lipo’ s or only LiFePO4 ?
Will, Are you charging through the BMS with the shore power or the solar?
Thanks for education. Enjoy all your videos.
I am going to install this BMS to 4S in 7 packages and then connect them together paralell for a 12V system. I dont see any worries about this exept for the safety issues of course. I have an Inverter 230/3000/12. I think that a discharge of 60A for each 4S will function. Any thing I should reconsider?
great explanation! You're an excellent teacher!
Have you considered adding a FLIR type infrared thermography camera to your test kit? I ask because while all of your electrical data are gathered precisely, but your thermal data is gathered by touching components. Even a cheap IOS or android thermography camera will give you and your audience a much more accurate data set than your fingers. You'll be able to analyze the entire system thermally all at once with an image / video that looks super cool (so to speak) Anyway, great channel and great reviews. Keep up the good work!
The problem with Daly is that when you order stuff from them it takes two months to get it
thanks for this great tutorial, i know there is a difference between chargers for Li-ion and LiFePo, so my question: is there a difference between bms for the Li-ion and LiFePo batteries ???
Will thanks for your efforts in getting all of us on board. Question I have set up a 4s12V Daly BMS on 4 -280Ah cells. BMS will not let the attached inverter function. Do I need to “jump start” the BMS with a short burst of charge current from a 12V charger?
IMPORTANT QUESTION: I like that BMS Daly you show. looks like heavy duty. So I used link and they said Common Port and Separate Port. Which one are you using and what is the different ? Thanks very much ! Looks forward to your answer so I can buy right one.
Question 2: Do you think the BMS 100 Amp Black and blue wire is bigger Than the 60-80 Amp BMS ? because I want to make 12v with that LifePo4 3.2v 50amp Blue batteries. Want to start the Honda Odyssey minivan v6 3.6L or Toyota Camry v6. Thanks
what is the brand name of that bms plssss...
where do you usually connect the negative side of the inventer? is it before bms or directly to the battery terminal?
I remember reading of someone that used a version of these designed for a Chevy volt battery that killed the battery after an overcharge. You really need to test this stuff and not rely on seller information or datasheets. 2.5V is also low for cut-off. The cells will form lithium needle microshorts and then dendrites doing that often, and can then overheat when recharging. You always want a BMS with battery temperature sensing for this reason, I'm pretty sure there's a version of that BMS that comes with a temp sensor.
The voltage specifications for this BMS are perfect for lithium iron phosphate and no other cell chemistry. I can't imagine somebody using the wrong BMS for the wrong chemistry. That would just be a horrible idea
@@WillProwse The person had these same BMS specifically programmed for Chevy volt batteries at the factory, and had no problems with most of them. Always test a BMS like you did before putting it into service. It may only take a poor or corroded connector to increase resistance for the BMS to get a false voltage reading and allow the batteries to overcharge.
So true. Good point
Legendary videos!
I checked the BMS and it says in the datasheet "over discharge detect voltage at 2.2V" - which I think is too low, isn't it?
Will's BMS cut off at 2.5V with an over discharge protection. I don't want to destroy my cells...
Excellent . always watching your videos .. hare learning much more then other links .
Base in LANGKAWI MALAYSIA
How to know how big needs to be the bms in A? The maximum output of my batteries or the maximum consume of my appliances? I am confuse :( my diy battery is 48v 50Ah - 54Ah and sometimes my appliances are going to consume a peak of 4000w a few seconds. I hope any bms can be use in parallel when I make a second battery in the future >.
I first soldered the P-, B-, C- onto the battery. I continued hooking up the balance wires in the correct slots but in random order, then i noticed little smokes were coming out of the bms, but the battery pack were fine. Is there a pattern to install the wires from the BMS to the battery? I’m trying to find out what I did wrong. Unless it was a defective bms.
Thanks for the video! Is there a version of this for a 400ah sinopopy bank with 2000w inverter and corresponding loads? I need low temp charge cutoff protection too!
Trying to work with an existing setup that doesn’t currently have any BMS installed. Thanks!
I have wondered about the BMS, disconnecting from the controller, I thought about putting a resistor bypassing the BMS to controller, like 100watt, 10 ohm or something, just enough to keep some power on the controller, but in most cases, the controller is cheaper than the battery, and your house, if it is burned from over charged lithium batteries,
I have an outboard motor on a boat that needs 200-300 amps to crank for 3-5 seconds at a time. Start up several times in a day, then 30amps continuous for the rest of the day. What Daly BMS would be the best to buy?
What is that blue "battery protect" you mentioned at around 5 min? You said it could disconnect in case of low voltage.
I for now charge without bms, its kinda spooky starting out, I try to stay at 4v per cell, and looking in to a high voltage disconnect, for controller only, I also have a low volt disconnect in the works , just incase the BMS fails,
I hope you are using LiIon... not LiPo4 batteries!
Hi there nice video but could u use a battery tester to see how many cold cranking amps , your battery delivers, I was just wondering like how much cranking amps can this battery deliver
Hi, Will. Have you experienced a BMS low voltage disconnect and then the BMS won't reconnect when cell voltages recover? I'm using the Delgreen
4S 100A PCM/PCB/BMS. Thank you.
been watching a lot of your vids, if i build 2 sets of 12 volt battery's using 4-3.2 volt cells, could i charge 2 of these with one 4s 60 amp bms or do i have to disconnect one pack and hook it up to the other pack, or can they be charged together some how as one large pack
Dear will I'm purchaseing a travel trailer that I'm building can I pay cash you to set up my electrical stuff when I'm done building? Thanks..
Please build a 48v 16s daly bms 120ah or higher with communication protocols for deye luxpower or branded inverters
MrWill, I have purchased a Dale 200 amp 16 S their English manual would probably be easier to understand in Chinese. My question is this I’m setting up my batteries I want to charge them in smaller configurations at first. Can I use a Daly 16 S on four LiFeP04 cells at a time, thanks for your Informative postings!
I see your channel's name is "DIY Solar Power with Will Prowse"...have you considered other Solar Power Energy Harnessing Applications? Such as Solar Ovens ? Solar Water Heaters, etc. and also maybe some Physics behind Solar Power for those that are interested in the Science behind Solar Energy. Lastly maybe some predictions as to your thoughts on the future and where Solar Power / Batteries are headed. like in Graphene Batteries etc.... no Doubt Solar Energy Harnessing is our future, the path that we take going down that road is yet another matter entirely...thnxx for the info, you are quickly becoming the Solar Energy Source on TH-cam....
Hello, Great videos I have watched most of them. I actually was looking for a new BMS and found this one online and thought about it. I have just bought some Miady 36ah batteries and was thinking the BMS needs an upgrade. Currently, they just have a tiny little non-heatsinked one that sells for about $4. Would be great to see maybe a video taking the cheap Miady cells and replacing the BMS or combining them in a new box with a new BMS.
So the Miady batteries really overheat during load to the point they melted and weren't safe. I think the cells are okay but thinking of making a better battery from them with a new BMS and some cooling. I need to be able to drawn 35amps continuously peek but generally 5-20amp.
Very useful video, thank you. If you’re building a battery with new cells and a bms like this one. Do you need to bottom balance the cells like you would on used cells or just let the bms do the job?
i have 8 of those batteries in this video i want to wire them 12v with max amperage could do you have a video on how to wire 3,2v cells in series and parralel to do this cheers from Australia
Hi,
I have a question regarding BMS and MPPT SCC,
the issue about the BMS high voltage disconnect which could damage the SCC while charging,
what was your thoughts on this?
Please can you expand on the connections for a common port BMS not sure how I would connect? T
So I'm looking to build a LiFePo4 battery for a dual Battery setup in my 4wd, just a quick question if I was to charge a battery set up like this with a DC DC charger how would I stop it from going into an over voltage situation? Would the dcdc charger disconnect it's self before the BMS trips?
Hi Will! Excellent videos! I would like to use 2p8s installation with one BMS, but what you say about using only 1 BMS? Could you recommend what kind of setup I could use to build roughly 400ah system? Problem is that I could not find any 400ah cells and 320ah is little bit too small for my application. Thank you!
What happens if you don't use a Bms?
in a similar system
(I understand that the problem is that the cells don't load the same)
But is there any other complication?
I want to use a high consumption system for an automotive audio system
about 1200 amps
and there is no such a large BMS for this
LiFePo4 60A/H Yes.👍
Вы русскоязычный ? Нужна помощ.
Hi Will,
Great video 👍
Do you think it's possible to build batteries with these BMS on each battery and then parallel these batteries together to increase capacity?
I wonder if you could get by Charging a lithium battery With a lead acid charge controller as long as you have a bms?
Hi, do you think if I make 12v blocks of li-ion cells and use one BMS to each 12v block, i can connect the blocks (+bms) in series, it would work?
Nice vid's but what amperage can it charge at? Looking to be able to charge a lith bat at 50 amps
I have a 12V 4 cell 200Ahr LiFePo4 Prismatic battery I got from BLS. And the BMS is the DALY 200A. I got it all hooked up then tested it out and it ran the 12V fan only a few minutes and it stopped. I checked the battery, all the connections and balance leads and everything is just fine, but the BMS won't complete the connection. What do I need to check?
Cell Voltages:
1 - 3.284
2 - 3.274
3 - 3.275
4 - 3.273
I have a question sort of related to this. My Liitkala 150ah battery showed 0 v when doing maintenance charging. I couldn’t get any of the boost procedures to work so I took the battery apart and found that it had 12.9v in the battery pack. I bought a new Liitokala BMS and now it has 6.4 v at the terminals and my lithium charger still won’t charge it(still has 12.9v from the battery pack to the BMS). Bad BMS or other problem? The new BMS was a mirror image of the old one but I noticed that and wired accordingly. Thank you
After reading many internet sites I finally decided to test the b1 b2 b3 b4 voltages and found that they were descending from b1 12.8v to b4 3.2v. I thought that the bms worked by reading the voltage of each battery then adjusting the charge. This is not the case. It analyzes the total voltage starting at 3.2v at b1 and growing to the 12.8v at b4, adjusting the charge of each cell by the variance of each from the expected accumulation of the cells. Since the replacement bms was a mirror image of the original, I had the cells wired backwards in order.
I bought a daly BMS and 4 lifepo4 cells from China, if i connect the BMS to the cells, is it necessary to bottom balance the cells or will the BMS take care of balancing the cells?
If i set my mppt to only (de)charge between 20-80% do i have to worry that i didnt bottom balance the cells?
Have you got any vid on how to wire to 2 battery banks with bms
Hi.i bought a similar like this- with a 30A discharge current, and 15A charge current.. my question is what does 15A charge current mean? I checked mmpt charging current exceeds at 21A at noontime.. what does 15A BMS charging Current mean then, does it mean- it limits 15A only?
Great videos my friend. I just purchased 4 cells 200ah from ali express. I'm a litlle confused with what bms to get. Please advice
I'd love to see your most cost effective solution to incorporate a solar MPPT controller with a li-ion battery and then a DC-DC charger in one system. I know you don't like it, but it's something I'm designing in my RAV4 hybrid build as the 90W panel on the roof rack won't have enough juice to charge my lithium house battery...so car charging will be a necessity and I don't want to have to charge off solar, then manually disconnect it and connect the DC-DC charger. Something automated would be wonderful!
Just do it. You can connect multiple charging sources to your battery. Nothing special
Can positive negative terminal directly be added to inverter
hello.. i need to ask...if the inverter overcurrent, will the BMS also stop the current between battery and MPPT charger ?
then, if the battery fully charged, will the BMS also stop the current to inverter ?
because i'm afraid if BMS stop all the current, it will damage the MPPT charger or solar panel. if so, i plan to bypass from MPPT directly to battery
Where did you get the little meter that monitors the voltages at is charges up?
Hi. Thanks for the videos. If I want to connect that bms battery pack in parallel with another identical bms battery pack to get 80 amps. Do I need an extra BMS that manage these 2 ones? Or the BMS are only for series systems?