Practice test of the new JK-BMS. All new functions tested. You won't believe it!
ฝัง
- เผยแพร่เมื่อ 11 ธ.ค. 2023
- So, here is the first full charge cycle test with the new JK-BMS controlling my Victron Venus OS system. Absorption, timer, float, re-bulk... impressive! What data is showing int he Victron system and is it correct? Do the timer work? How do they work? When and how does the BMS reset to 100%? Float Mode on/off, what does it do?
And the programmable relay functions. Do they work? How to set them up?
Almost too many questions for one video, but... I got it done. here is all you need to know.
The new JK Inverter BMS, all details, specs, price and the discount codes:
off-grid-garage.com/battery-m...
All new JK Inverter BMS features explained:
• New JK-BMS with full c...
The Frankenstein Battery series:
• The Frankenstein Batte...
The amazing Peter Board (JK-BMS Interface board):
• Perfect charging solut...
Aiper Seagull Pro Lite, wireless automatic pool cleaner. Do you want to see a full review and test? Leave your comments below.
shrsl.com/4cct0
Please subscribe and join me on my journey of the Off-Grid Garage!
For more information, please check out my website with links to all the batteries, materials, devices and products I have used in my videos: off-grid-garage.com
The 'Buy me a Beer🍻'-link is here (on the website, scroll all the way down):
off-grid-garage.com Thank you for your support!
You can also click on the Thanks button under the video to support the channel. Thank you, if you have already!
T-Shirts, caps, mugs and more in our merch-shop:
off-grid-garage.com/merch
**** These are the batteries you are looking for ****
🔋➡EVE LF280/304 LiFePO4 cells 3.2V/280+304Ah: off-grid-garage.com/batteries/
🌞➡Solar charge Controllers, Inverters and accessories: off-grid-garage.com/solar-cha...
🔧➡Tools, Analysers and Testers: off-grid-garage.com/equipment/
📈➡ Battery Tests and Results: off-grid-garage.com/battery-d...
🔌➡Batteries, charger and accessories: off-grid-garage.com/batteries-3/
⚡➡Cables, Inverters and Electronics: off-grid-garage.com/electronics/
The Sunfunkit DIY battery. Great product to build your own 12V battery. Use OGGA at checkout to get 6% off. More info here: off-grid-garage.com/diy-kits/
Video review: • The Sun Fun Kit Experi...
Best prices for Victron gear in Australia: Auto Parts Co has you covered.
www.autopartsco.com.au/?pd_pr...
(they have 4WD parts and accessories too)
Take a live sneak peek at the Off-Grid-Garage in the Victron VRM World (link at top of the page):
off-grid-garage.com/victron-c...
Here is my Tesla referral link, if you want to buy any Tesla accessories or even order a vehicle. This is a great way to support my channel. Thanks a lot to everyone who have used it so far 🙏 www.tesla.com/en_au/referral/...
My other (German) TH-cam channels:
/ offgridgarageaustralia
Please don't leave any links in your reply. TH-cam will not publish your comment in this case.
If you decide to send me an email, I really appreciate your time and effort for doing this. However, please consider leaving a comment under my videos instead as I may not be able to reply to your email due to the sheer number of messages I'm receiving. - วิทยาศาสตร์และเทคโนโลยี
This company owes you big time not only for your research and development but for sales. You actually show us and answer the questions we are going to have.... When you look at how many people "listen:" to you ...100 per hour at this point.... you make the best professor at the best university look like he has no influence as you touch so many more people that are actually listening.... you have changed my life and many others. I live RURAL Canada... Starlink and Lithium batteries have changed my world entirly. thanks for sharing
Thank YOU for sharing and you kind words and comment.
That is the main goal of this channel, to trigger people to start their own projects. And TH-cam is perfect for that. Honestly, I would do all these tests anyway just for my own sake but am so happy that other people get inspired.
Thank you.
agreed..! at the least, new products for testing from JK (of course for free in exchange )😉
@@OffGridGarageAustralia Andy Is it possible that the BMS cannot set the voltage to which the battery should be discharged? is there only protection voltage?
@@Lertem444 not sure what exactly you mean. The BMS has an under voltage protection but this is not how far the battery normally should be discharged.
@@OffGridGarageAustralia Yes, this is a problem, the inverter does not know to what voltage it can discharge, it is only based on the soc. It's a pity that it doesn't limit the discharge current to 0 if one cell has a lower voltage.
If there would be a Nobel-prize for solar, Andy would be a serious candidate…
Thank you for your amazing work !
👏👏👏
Thanks a lot for your kind words!
I never ever thought that everything major would work - this is really amazing!!!
THX for all your effort on this Andy! 🐸
I have 3x PB2A16S20P with firmware V14.13 and all of them loose their settings when they are switched off with the button! With the previous firmware (V14.03) they all kept their settings, so this is definitely a bug in the new firmware. SOC calculation is also wrong, because it shouldn´t change when you change the overall capacity.
At least all the other functions seem to work (as long as you don´t push the button and the BMS goes back to LiPo settings!!!). Nice work!
Andy you're doing such a great work testing and explaining this stuff. It is really nice to watch your videos!
Genialllll J'attendais ça avec impatience ❤️ Parfait !!! 🎉 Vivement la fin du test dans la prochaine vidéo.
-------------
Genialllll I've been looking forward to this ❤️ Nice work 🙏😄 Perfect!!!! 🎉 Can't wait for the end of the test in the next video. 😊
Great work on this Andy!! Thanks for all you have done for the DIY community. I would love to see a review on the pool cleaner. I have seen your pool cleaner and cordless tools in the background for over a year now and I always wondered what products you would recommend or not recommend. I look forward to what you come up with for 2024. Happy holidays!
Andy, is my Sunshine! Thank you Off Grid Garage for all your hard work.
Thank you. Happy to shar the good news.
Thanks for your tireless lobbying of JKBMS to make a better product for us all Andy :)
Not currently in the market for a BMS but when I do need a new one I now know which one to get :)
Thanks a lot for your support! Sorry, just saw this right now.
Vielen Dank Andy! Hatte mit dem Kauf noch gewartet aber nun kann ich beruhigt ordern^^
AS ALWAYS, Thanks Andy. Awesome as usual. Stay cool! Your work is priceless for lots of people around the world, and so much appreciated.
(We’re really into a heat wave now, however A/C is keeping us cool thankfully! 😅 Even the pool is no longer refreshing- more like warm soup.)
Thanks a lot, Dave. Same here, everything you touch is hot!
Hello Andy,
a truly great job. You have tested so many BM systems and have always encountered the same problems. I can still remember when you started with the Seplos BM systems because someone told you that it would control your inverter. I would never have thought it possible that JK would do this now. You also played a part in this through your work. JK probably wouldn't be talking to you like this if you didn't have this range. Congratulations on the 75,000 subscribers. You've really earned it. All the best for you in the future and I look forward to the next instalment on JK BMS. If only it had been 1.5 years earlier. Many thanks and best wishes to Australia from Germany.
P.s. Send some sunshine over. It's just sad here.
Thanks a lot for all your great comments and support, my friend. I appreciate you kind words.
It took us quite a while to get to this point, but a firm stand, and a great community have finally led to this success.
Very informative video. Thank you very much Andy. They fix the firmware, I'm knew it. Whatever I'm ordered the third JK BMS. Because of you Andy :) Because you always making the good knowledge for us. Thank you Andy!!
Hello Andy I understand the 75k.
You are a genius, an amazing knowledge.
I'm from Castelnaudary, the town of the Cassoulet.
I understand why peoples are watching ypur videos and why manufacturers are looking for you. You are professor who teaches us.
Thank you for all your help and work to let us just buy and use without testing.
Thanks a lot
William
Hi Andy, And thank you again for this video and the previous one about the JK BMS.
Well apparently it succeeded!
We can say JK team we work really well, it's very good!
For all this time, multiple BMS on the market still have defects in their program?
Hopefully others will follow this way.
In any case, thank you again Andy, your videos are always great and with very good explanations.😉👍
WELL DONE!!
One commemt; The 'old' jk (I'm using an 8s in a 12v config) shows amps too low at low current and to high at high current.. I'm just following my 500A Victron shunt as 'true'.
But in this inverter style JK bms you rely on the jk shunt. Hopefully it's giving an okay value when calibrated. Something to test there Andy😎
Opening an icecold S.P.A.T in the even colder Netherlands. Closing in to our shortest day, your longest and we cycle again.
Cheers!!🍻🍻🍻
Great review Andy, I have a JK Bms on the way + a Peter for our 100ah Jaki looking forward to your results 👌🇦🇺
Wow. The balancer on that BMS rocks. You managed to capture the magical balance zone on video where the voltages diverge, and the current starts to drop. You can even see a bit of the franken cell behavior, where the highest cell switches as we approach the balance zone:
The just before balance zone:
@9:47/53.44V/11.2A cell4 = 3.332V and cell 16=3.346V (-14mV)
Enter the zone (note the franken switch of high cell- a grade A cell would not do that I assume):
@11:57/55.06V/11.2A cell4=3.489V cell16=3.417V (+72mV)
Well done top, job can’t wait to build my new cases now.
Thank you. Yeah, it looks really good and seems to work without issues so far.
great job Andy
Aaandyyyyy!!! You got it... You had them working their buts off and deliver almost everything they promised.
It has been sometime since one episode got me this excited. These are great news!
Finally they start to understand, and beteeeer... Listening, and reacted really fast actually.
Let's see the communication part with several bms's, and how you controll them and the master/slave etc ..
Greeeeaaat work from JK and our guru working together!
Best regards from cold Madrid - Spain
And it would be nice to explain the pinout of the RJ45 RS485 / CAN and which cable you use in the next video.
That BMS is looking great? Sounds like they thought of everything!
Cool pool cleaner too!
Thanks for the hard work Andy. Just contributed another $20 us to your beer fund. Thanks again.
RS485 setup for firmware update - cat 5 pinout jk uses wires 7 and 8 - can only set uart to jk protocol if dips are set to 0 - communication only works if dips are set to 1 - thanks Andy for your time and effort!
I'm about to check this.... wish luck - I'm at wits end.
I bought 3 of them !!! 😊 last week !
It looks good. Hope to have my pack built over xmas and the new BMS configured. Firmware update required. With that many options now available in the settings Im going to have to keep referring back to this video for the base settings config. You better do a write up as well Andy. I'll be suffering from memory loss every three minutes.
Great video, great test, great results. What a great Andy. We were waiting for these results from weeks, jk are up to Andy's challenge. What else can we ask jk to modify or add? Thank you for the efforts you are making Andy. 🙏🌹❤️
Andy you are by far THE BEST ONE. An other impressive presentation...
You did it ... congratulations. 👍 Now make them add some Home Assistant integration.
🐸🐸🐸🐸 I think I will have to order one in after Xmas Andy .This might be the way to go for my setup.
Hi Andy, as usual a great video i would like very much also to see a comparison/review on features on old jk and new jk bms with Peter board dbus serial driver (L.v.d.Walt )as these features are very much the same . Kinda keen to see the comparisons Anyways Great work
Excellent. Excellent, Thank You
It's professional explanation, useful to me
Thanks for the feedback.
Great video again. Suggestion - Compare features of new Jk with old JK and Peter board as well as old JK with dBus serial driver ( Louis vd Walt ), These three option are all very similar in features offered. Would be interesting to see a review of all three.
Regarding the slow charge at the end of the charge cycle: you DO need such a feature, since if you’re charging to 57.6V (which is the typical setting for most 48V nominal LFPs), then the highest cells will shoot up too suddenly and the BMS will trigger an OVP, even while the charging is ramping down.
Then, there is something wrong with your pack or too balancing.
A good, balanced pack should have no trouble charging to over 3.6V without triggering anything.
@@OffGridGarageAustraliathe same thing happened to you Andy, when you raised the voltage of your batteries. No passive-balancer BMS can cope with a full current charge, no matter how good the cells. And you know that very well.
now this is the of the best inverter BMS, the programable dry contact finally is here and it is without the need of trigger by alarm, that's just amazing, i always want that function. JK just need to brush up their LCD graphic design (JBD doing very good in LCD graphic design)
Hey Andy, you said at minute 18:22 I don't want to spend.... Huh! Every time I watch one of your videos I see you in the Garage.
That was great Andy! Thanks for the considered testing. On another note: I'm going to have to turn you in to the SPCRL (Society for the Prevention of Cruelty to Robotic Lawnmowers) as we all know that's what that poor thing really was..
Just a quick comment on the 100% SOC reset function: The method deployed here resets to 100% when a voltage is hit. That is so much better than the HV disconnect reset I found on lots of BMS’s. You have your own improvements on this but one improvement would be to also check the current: only reset if the current is less than some threshold -say 1A would do and cover 99% of the cases. A further improvement would be a current less than some threshold for a given time: say 1 minute.
Voltage > 3.45V
With current < 1A
For at least 1 minute
That would be on my wish list for any of my BMS’s…..
And then if they could release an FW update to their older BMS's everyone would be happy.
I seem to have an issue with 100% reset triggered at really low SOC. Its caused by a sudden peak in amps by sun coming out. Is there any way to work around that?
Thank you andy my eve batteries are about to arrive.. and ill just order the JK after you do the parallel testing .. so please do it in the next video.
Coz i need to parallel 16S 280 with another 16S 280ah batteries .. so would need two sets of batteries woth 2 bms that needs to communicate.. else my installation will get delayed.
I cant thank you enough. You saved my bucks where i was going to opt for Neey balancer separately with seplos.. but this one has now xhanged my mind to.99 % i will be 100% sure after you have the parallel comms. In between two batteies
Great stuff. This is the real deal!
Yeah, looks really good!
Thanks Andy
This is extremely encouraging and shoes how quick progress can be when working in with the right end-user for engineering input and testing. But beyond this model, has there been any indication about JK flowing all this progress back into the lower voltage/lower current BMSs in their range,to suit boats etc?
Thanks!
As always another great Video. So I bought two back in October when you first spoke of them, I have installed onto my battery, and after this video decided to give the CAN bus a go....have waisted a lot of time attempting and I am starting to think I have broken unit. Just want to confirm the connections. Cerbo End, Pin3 GND, P7 CAN H, P8 CAN L, at the JK BMS END, P7 GND, P5 CAN H and Pin 4 CAN L. if this is correct then my BMS has coms issues. I Upgraded firmware to 14.13 after watching your video and also noticed if you power cycle the BMS, it looses all settings, another poster here made the same comment. Cheers Andy great work.
All working, Turns out the JK-BMS manual with the wiring diagram is wrong. Used the Jakiper Battery CAN cable and it worked immediately. Cerbo could only see one battery with dip sw set to Add 1 & 2 respectively. Found one Dip needs to be set to 0. the second battery is then 1. The PC software cant directly connect to a battery with Add 0, however connects to the battery add 1, then under the parallel tool you can select a battery with address 0. So all in all working, both JKBMSsss reporting to Victron via a single Can Bus lead, just using the battery to battery RS485 link as would expect. Perfect. Thanks Andy for pushing JK to make the perfect BMS...Next I might try getting the Jakiper to talk to the JK using pylon tech instead of Victron proticol. Victron reads Pylon natively I believe. That would be good to have 2 diff brand BMS all talking and reporting through single CAN cable...job for tomorrow
24hrs has elapsed and there is a glitch in the matrix. Any Hints or others experienced this. After being connected and working in parallel for a while, the slave stops reporting to the master. As such the Victron Cerbo only showes half the charge current going into the battery, the rest is unaccounted for. Doesnt seem to effect the system as the master slave naturally balance out anyway. The way I have fixed it is to go into the PC software and select parallel tab and talk to both through the master and it resets the coms. On the App status screen there is a "PCL Module: OFF" status, I have been talking to Helen at JKBMS and she says this needs to be on. But cant tell me as yet (last 30 min) how to do this. Any one else found out what to do here?
As always, awesome informative video!
Andy, have you checked the CAN bus connection of the Raspberry Pi + CAN HAT with the new JKBMS? As far as I can see, you have tested it here with the Cerbo GX only.
Many thanks for your support for such a large community!
Thanks for the great content Andy! I have a suggestion for future offgrid garage content: i cannot seem to get the victron ev charger to throttle down the charge amperage. It keeps charging at full power. Would it be possivle to explain your setup? Would be very interesting.
well Done!😊
Thank you.
I know you will love this Andy. Daly has a new design, not sure if the circuity and programming was updated.
I've got this new BMS here for a while but no further instructions🤷♂️ It is still red, at least the one I have here...
Apparently, it also has cloud connectivity and comes with a Wifi dongle now, instead of BT.
Still unsure what is new...
In a world of such negativity
It's so good to find a positive entity!
Good stuff!
Hello Andy! Thanks for your very informative video's! I have ordered two of the new inverter BMS'es for my DIY battery build. Do you have any information on the voltage that is supplied by the dry contacts / Relay? Could I power a 12V fan with it for instance?
Nice ! Own jk and im love it . What’s the current limit of this dry contact relay ?
Like# 9 - Yasssssssssss, can't wait for the follow up vid
Looks like some great upgrades! Getting into the Batrium Range of BMS!!
Function wise, yes... just not with the high price tag.
@@OffGridGarageAustralia Very True!😆
Another awesome video and it's clear now that the new JK BMS or an older JK BMS+Peter board really are a one stop solution for DIYers in an affordable price range. One question I still have is. Has anyone worked out a way to access and be able to change BMS parameters via a remote platform using Wifi or is it still just bluetooth for changing the settings?
Mulțumim!
Thanks a lot for your support.
JK if your reading this, How about a cut down version of this product that only retains the cell balance/monitoring functions and the dry contacts to control Inverter / Mppt. No need to run the load/charge through the BMS.
I would love to see two things:
1. Have the option to inverse the relays. So it will open on action so we can hook up a battery protect to disconnect loads when the battery soc gets too low.
2. For the float, set it so that if it drops below a certain voltage, rebulk (this may be an option).
Well, the relays will have only limited current they can switch, so you will have to connect another larger contactor and can reverse that if you need to.
Yep, float voltage off-set will work as well. That's what Victron does...
@@OffGridGarageAustralia Example would be a Victron Battery Protect with the relay for DC loads in an RV. It draws milliamps so I would think the relay would be able to hand. However the Battery Protect requires the relay to be closed in order to operate. I could wire up another relay to do the inverting of the logic, but would be nice if they could build it into their software.
Shunts are usually a lot more accurate than clip-on amp-meters for DC measurement. The clip-on has to use a hall-effect sensor to actually figure out DC amps because there is no AC waveform to induce a current in the clip-on's inductor. That said, as long as you zero the clip-on and don't have too many other wires nearby, it should be more accurate than the difference you saw with that many amps going through it.
thats true ,but this bms has got bad out of the box calibration voltage and current.
Yes indeed, the old jk (I'm using an 8s in a 12v config) is too low at low current and to high at high current.. I'm just following my 500A Victron shunt as 'true'.
But in this inverter style JK bms you rely on the jk shunt. Hopefully it's giving an okay value when calibrated. Something to test there Andy😎
Thank you very much for all these fantastic videos! I have a Jakiper JK48V100PRO 48V 100Ah battery, and due to space constraints, I need to position it vertically (with the display facing upward and not forward). Do you think there could be any issues? Thanks.
Hi Andy. Great Vlog. Any chance you can test the relay contacts in a bit more depth? It would be great to see how they work for voltage alarms and current alarms as well as the temperature you tested. Can multiple triggers for the same relay be set or is it just one for each contact? If multiple per relay contact then this would be great for turning off alternators in campers and boats to save them from BMS disconnects.
Each relay can have only one trigger, selected from the menu.
They basically work the same way. So choosing Over Current, you set the point where you want the relay to close and open. Each trigger option has always a value for on and off.
Andi awesome stuff! 😎
Quick question: if you're getting bored of those lifepo4 batteries, do you think you could do some experiments with Na Ion cells? Including some nice Versprecher calling Na Natrium ? 😬
I've got Natrium batteries here. Just need to find some time...
of course
Merci pour cette bonne nouvelle maintenant la perfection ce serait la communication de 2 bms jk sur le cerbo mais ça me semble beaucoup plus difficile, je croises les doigts.
lol, 35 degrees Andy. I wish 37 down here with humidity. Felt like Townsville weather. Morning thunder ⛈️ here right now.
Moisture is mostly gone and we're back to the dry heat we have during summer. Hot, but no sweating, love it.
@@OffGridGarageAustralia Good Times for a swim in the pool.
Hi Andy, thanks again for this video! Quick question: When connecting communication of JK BMS and Victron, I think you are connecting GND aswell? What does happen if the BMS interrupts B-/P-? Isn't then there a Minus-'loop' rsp. connection between Victron Minus and B- through the (very thin...) communication GND? Or is there anywhere anything optically isolated in the communication? Thanks & greetings!
Super
Thank you very much Andy you are the best!
One question please have you plugged your communications cables like you did in the last video ?
(it's to upgrade my firmware on the JK BMS)
I can't communicate with the BMS at this time..
USB-RJ45 adapter on the bms's communication board but i don't know what COM PORT Number to choose...
i tried many ports with no success
Thank you very much for your generous support.
I'm testing this parallel setup right now and am in contact with JK to solve some further 'challenges'. Unfortunately, there is no documentation about all that...
My battery is a 280 amp 48 V 16 cell EVE at 3.2, The BMS is a Daly 250 amp. I have a QUCC 10 amp active balancer. The build was back in May 2023 and it is now December. I have had to replace a cell. The cells were less than stellar when I got them so it came as no surprise they didn't match well. Over the months I observed the cells as they charged and noticing one always was the high cell and one was always the low cell. I discharge overnight and the next day recharge with the sun. So the process played out till one night the battery nose dived at 4 am. I also have a 120 amp 48 V battery in parallel which saved the system from going down but it went to the grid went it ran down as well. Turned out the BMS shut off the 280 unit due to the low cell hitting the 2.5 v limit. The battery was still at 50% so next time it did this I I replaced that cell and it ran for the rest of the night and ever since. The fact is charging the battery may well have damaged that cell. I think it was bad to begin with but now I am building a second 280 A battery with 16 new EVE 3.2 280aH and I am trying to find a charging solution to avoid possible damage. As the battery charges at about 40 aH it is below 10 to 20 % C rate, 280 plus 120 A = 400 aH would be charged at less than 40 X 2 = 80 aH. Also I do not let the voltage be excessive so I use 54 to 55 V. Which is 3.375 to 3.4375 per cell. Now the issue is that as the battery reaches 100 % the delta gets up to 250 mv. It is only 30 mv at 95 %. That means very little capacity is left between 95 and 100 percent. So I thought since the battery cells are on average 3.31 v at 95 % set the charge to 53 v. The next charge cycle stopped at 40% since the battery reached 53 volts within an hour. So I had to go back to 54.5 volts to get the charge back on. So it appears there is no correct voltage to charge the batteries. I will set it to 55 volts and when it reaches 95 % set it back to 53V . I do not have means to top balance the new batteries. They are all at 3.31 volts but the capacity is not known. A capacity check is one way to damage cells. It also takes a very long time and I am not equipped or experienced enough to do it confidently. I am in the Philippines so I am on my own with this.
A normal top balance did not resolve the issues?
Hi Andy, These are obviously designed to go inside a server rack style battery case.
For those of us using D.I.Y battery shelves can you request they make one with its own IP rated protective case? Preferably heatsink Aluuuuminum but anything to keep dust and bugs out will do.
We could 3d print a case for the BMS but not everybody has such toys.
Thanks for your hard graft Andy.
Gaz 🏴
That will be very difficult. All batteries and electronics need to go into some sort of case or protection, either together or separately.
Even they would build such a case, how do you handle all the other connections outside of this BMS?
So, if you keep the BMS close to the battery and enclose the battery in a shelf for example, it should be safe enough.
And a case with aluminium heatsink will cost money again. People already complain about $100 for a Peter Board...
@@OffGridGarageAustralia Hi mate.
I think it is daft they have removed some of their market by selling a naked unprotected BMS. Just a simple case will do, yes there will be a premium but at least it will be protected from dust and bugs.
I would like 2 and I though the price would be alot higher than it is. But not unprotected. I have spent thousands of pounds so far I wouldn't complain about the extra price for a protective case..
My Daly wins this one lol, the thing is indestructible 🤣🤣🤣
@@OffGridGarageAustralia Just a follow on side note, my battery shelf will not be hermetically sealed. I will eventually be using louvered doors to allow cooling air flow.
Cheers buddy
@@garys-half-baked-offgrid-dream It does not need to be sealed but as long as nothing can be touched or you accidentally drop a tool on the connections, that is all good.
@@OffGridGarageAustralia But Wild Pygmy Haggis Puppies can get in there and then it will be game over lol
Shine on you Crazy Diamond.
Gaz
Let's see if JK will give us a nice Christmas /New Years discount!
Hi Andy, have you tried the home assistant add on called Batmon to monitor all your bms via Bluetooth no cables or special hardeware needed it reads the bms via ble Bluetooth and can even write some info back sorry if you have covered this before, Have 🎉 a SPAT on me bud and keep up the entertaining show it my favourite even the wife watches it with no interest in solar 😅
Hello Andy. I have been watching ur series on the micro inverters and i thought it was great. I was thinking of getting a wood boiler with an attached stirling engine that produces around 600-1000watts of power while the boiler heats my off grid home. Now i was thinking it should be possible to hook it up in the same way as an micro inverter , back feeding the micro grid so to say, this is just an idea i have at the moment but logically thinking it should be the same right... Anyways great content as always :)
Danke Andy. Where did you connect the Temp Sens? Are they part of the order?
Yes they are included in the balancer loom.
Andy, I use Midnite Classic charge controllers for charging my cells, they use an RS485 communications protocol. Do you know if there will be 3rd party support with these JK BMS software to control them or ones similar?
Incredible video. I learned a lot. Without your videos, I couldn't figure out the difference between the older BMS and this newer one called the 'inverter' BMS. I thought "does it have an inverter too?" I echo that JK owes you a ton.
In watching your video, I had originally thought that the 'inverter' BMS could actually float the battery, do absorption etc. but that appears to not be true - it only communicates with the charger to change the charge voltage. This brings about many problems because now you have to make N different chargers work with the BMS. Solar charger controllers, Grid/Wall chargers and Inverter/Chargers most of which won't work out of the box, or at all. (Like the EG4 chargeverter) Plus you have to have cables between all systems, coordinate them etc. Lot's of failure points and complexity.
Am I correct that 'floating' the battery means charging it up to it's final voltage (say 3.65V) then reducing voltage to 3.6V and letting it sit there for 6 minutes or so, then stop charging. Wouldn't it be possible, even easy to do this in the BMS itself? Given that all charge and discharge current already goes through the MOSFETs, why not just PWM the FETS to effectively decrease the voltage across the pack. The MOSFETs are like a variable resistance in series with the cells. This way the BMS could do its job managing the battery and would be even less dependent on how how the battery is being charged. Just program the charge source to output 3.65V/cell (or whatever) and cut off if it's higher. Then use the above technique to lower the voltage as needed for charging and floating. You could also implement a buck converter but I think using the existing MOSFETs would work, and it might only be a software change and possibly some capacitors. You might even use this technique to have a wider allowable input voltage range - have the BMS control that, since the MOSFETs are in series with the cells already. MOSFETs in inverters and motor drives are PWM'd all the time, that's how you get a sine wave output.
Thoughts?
Great video.
What about the issue with communication and the related protocols and ports? As mentioned in former videos. I am for the last days on 14.07, but as far as my brief test went I couldn't change the protocols back (they were locked) and beside RS232 I got basically no com at all. Hope the new FW fixes that.
Do you have you working RS232(RJ11) port on new JK-BMS?
Can you provide more details and screenshots?
Heya, alwrite here we go. oke I'm gone order 1 of these battery bms
👏👏👏
Great Video, one question, in Version 10 of the JK-B2A24S20P BMS when you turn on Balance at the top status area it shows Balance On all the time. But in the newer model HW/SW v11.xx even if Balance is toggled on it shows OFF. I believe it only shows Balance on when it is balancing. Can you please confirm. Thanks
Hi Andy, I was looking at buying the JK you show in this video. I clicked your link and it takes me ato a bunch of options. What is the best one for a home battery setup? I am looking to use a Victron MPii 5k, at first and then adding in a second one down the road for split phase. My assumption is to just order a 200amp BMS, but is it needed?
Thumbs up for this great research and that you keep pushing Jikong! But how do you install new firmware? I have the PC software and a USB-RS485 Adaptor. Fully disconnected the BMS first, then use the inverter port and tried device address 0 and 1, but cannot connect. Same with the other ports. Maybe wrong pinout on the RJ45 connector?
Fixed it. Just built an adaptor to get the correct pinout and then I could update the firmware. BUT: There are still many problems with the actual V14.13 firmware!
- the BMS looses all it´s settings when you switch it off and it goes to LiPo settings. So you have to set all the settings again and can never switch the BMS off!
- SOC reading is wrong. With 3.275V the BMS shows 33% remaining capacity when the capacity is 40Ah. When I set the capacity to 304Ah, suddenly the BMS shows 64% remaining capacity. Shouldn´t it just look at the cell voltage?
The rest seems to work, but loosing it´s settings and putting wrong values in, is an absolute no-go! Just imagine charging your LiFePo4 to 4.2V!!! And I have 3 of those BMSs and a total of 48 Eve304 cells.
@@stephanklasen2928How do I make this adapter?
Do you have a link to an image or video?
I'd be interested as well. I have multiple rs485 cables, rj45 to usb, and no dice.
Tried several different baud rates on the port too.
Holy shit!
Good afternoon. Is there a video on your channel about the process of pairing or connecting two JKBMS JK_PB2A16S20P boards?
Brilliant work Andy. I have 2x old JKs. Am I better to up grade to new JKs or go with the Peter boards?
I would use the Peter. That is cheaper than buying two of the new BMS. The Peter has additional features and full remote access but you miss out on the relay function of the new BMS.
@@OffGridGarageAustralia @eocallaghan Don't think that is correct, two new BMS are cheaper than 2 peter boards and better.
This is how the original video - Part 2 about new JK Inverter BMS should have looked like if JK had created good and tested BMS software at the beginning. Hopefully JK has learned lesson.
But personally, I think this is how this BMS turned out and will be even better than if JK had somehow made a functional OKEY BMS where the user adapts to the BMS, this way the JK Inverter BMS adapts to the user, which is exactly what we all want.
So JK Inverter BMS already has a history - character with improving curve and it's only been in the market for a little while, thanks to Andy's efforts and perseverance.
Let's see how the communication between multiple batteries works and when the promised 48 inverter support will be ready? ( and who will ever test those many inverters? ... )
Thank you. It has really been a team effort between all of us and JK to get this right.
As you correctly said, they should have been in this exact position from the beginning. They had all the support, the info, the ideas with the relays but decided against it.
Maybe they needed this wake-up call.
Hey Andy, is there a video on how to make the rs485 cable for applying this FW update? Or got any docs other than the one on your website, it doesn't say what pins connect to where on the rj45 port of the inverter
Pin1 A, Pin2 B, Pin3 is GND on the communication board. My USB Adapter has Pin1 GND, Pin3 A and Pin5 B, so I just made an adapter. You need to know the pinout of your adapter. I can connect on all 3 RS485 ports.
Hi Andy - I just browsed through the comments, but found no feedback on this point - so let me give it 😊:
I would highly appreciate if you tested the new JK-BMS with the Gobel Power Battery - in our Solar Community over here that is the most favoured one and I'm currently thinking about setting up a system with 2x Gobel Power Battery and JK-BMS as well - learning from you has been very beneficial ever since 🎉
Hey Andy, Does that pool cleaner get out of the pool before it goes flat? Or do you have to get in to collect it?
Once the battery gets to 10%, it parks itself at a sidewall and I get it out. Takes 5s...
15:49 At this point, Battery (55.2v) has higher voltage than SCC (53.6V). Once the inverter draws current, it will draw from the battery for a few seconds. Then BMS will instruct SCC to bring up the charging voltage to 55.2v. This causes SOC to rapidly fluctuates between 100% and 99%.
Personally I'd use float only on UPS where the battery is mostly on standby, but not on ESS where it goes from charge and discharge in minutes.
It won't do that. It will charge to 55.2V and keep the voltage there for the time you have set in the timer. Then, the BMS will instruct to lower the voltage to 53.6V and stay there for the time you have set. This last timer (Time RFV) usually sits on 6, 8 or 10h). There is no recharge to 55.2V for that day.
@@OffGridGarageAustralia Assume real world install: Battery with this JK bms, 5KW solar panels and SCC (that is compatible with this JK) and Inverter (Victron, Deye) with 1KW constant load all running on a sunny day.
Circa 12PM, Battery reached 55.2V; by 1PM JK sent float voltage (53.6v) request to SCC (as intended). Where will Inverter draw power from?
a) Battery, because at this exact instance Battery is 55.2V while SCC is sending 53.6V
b) SCC, because somehow 53.6V is higher than 55.2V (you know this is not possible)
In my experience, Inverter will draw from Battery, causing battery SOC to drop below 100% for a few seconds, triggering SCC to charge back to 55.2V rinse repeat every few minutes.
So Andy, whats next after finding, or better creating, the holy grail bms for lifepo4 batteries?
We're not done yet, still need to explore and test the parallel setup.
Got like 10 years worth of projects and videos coming 😄
Nice!
Just wondering. The BMS will change the voltage to the RCV or RFV values in your inverter (charger) as indicated. What if you have more than one BMS? Or do you just set it up in one of your BMS's? apologies if you already covered this and I missed it.
The first (master) bms is the master. Only this bms send the data to inverter/mppt (CVL and CCL/DCL)
Donesnt matter what voltage is set on other bms’s.
(CCL/DCL limit is sum. for all set of limits
- 1st bms 100A, 2nd bms 100A >> to inverter send 200A.
If the master is lost connection from other bms’s, its goes down to 100A.)
So, the master bms adjust the voltage limits (bulk/float).
Correct, the master will be sending all aggregated info to the inverter. It will be in one of the next videos.
Hey Andy, I am in the market for a BMS for a battery to connect to a Mutiplus II 48/5000 this one seems ideal. But why can't this logic be built into Venus and have it tell the Multiplus what to do? As long as the BMS reports the individual cell voltage to Venus I can't see why not.
Question, with just a normal JBD BMS, can’t you have your inverter or CC simply do what this JK BMS is doing outside of balancing?
As you see, CCL from the bms for charging the battery are the same, and it don’t drop it down, it is necessary for Invertor like SOLIS
As other way, it will give you all the way to 100% 95A 🤦🏻♂️
So with a couple of DIY 280 batteries, which is the way to go? Old JK BMS with the Peter, or new style JK?
That is up to you. I like the Peter because of the remote access and controls I have down to a cell level. I also like the HA integration and data it stores there for long term monitoring and data collection.
If communication and battery data this is not important for you, get the new one as it will be cheaper than the old one + a Peter.
Andy great video went to your website, but it doesn't give the model number. I'm assuming it is the JkPB2A1620P, correct me if im wrong
Well, they have 4 different models. When you click on the AliExpress link, you can choose which one you want to buy.
Hi, was auch noch interessant wäre stimmt der Strom und die Berechnung. Bis zu welchem Wert misst er überhaupt? Bei seplos sind es ja 0,5A und im Winter steht das BMS auf 20% und hat auf einmal unterspannungsalarm.
Yes, testing is underway...
I think I have just found my BMS! - However, discount code does not seem valid and they are not releasing until Jan 31? (Scored a LEAF 24KW that had degraded to 60% (15KW) for less than the BMS.) Would like to see an episode that ponders the best battery size for a particular set of panels.
Seems to be out of stock? Wow, they sold out fast. You can pre-order. I'll get the discount code extended...
The battery and solar panel size need to match in some aspect. I'll put the video suggestion on my list. Thank you.
Ok. I will let them know.
I just realised that you aren't using both screw terminals on the BMS for the battery cables. I always thought we had to connect to both terminals on both sides?