The JK BMS with integrated active balancer. This is the one!

This is one of the most exciting delivers I got for a long time. It has finally arrived: the JK BMS with integrated active balancer. The all-in-one solution, the Jack of all Trades under the BMS'.
After some initial problems to get it started (the manual was in Chinese), I am very impressed with the first few tests I'm running: over voltage, over temperature, over current... all disconnects the charger and automatically reconnects after the fault has cleared. Even the app for Android looks very mature and is working without any glitches.
Is this the BMS we have waited for? It really looks like it!
All information, specs and links for the JK BMS are here:
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[@creamshop]

Thank you So Much Andy for testing all these BMS's, making all the same mistakes we would have done and doing all the research , FREE for all of us to learn and enjoy, you are are the mother Theresa of the solar world, ok maybe not, Ghandy is better suited for you ! 😇🙏

[@OffGridGarageAustralia]

Thanks a lot Gilles! Appreciate your kind words.

[@oneman29]

You have made sourcing and comprehending this topic so much easier. Hats off to you Good Sir! 🎩

[@duncans4489]

I bought the150A version based on your movie. It arrived quickly and your work made it really easy to set up. Thank you so much.

[@alwoolhouse6255]

Thank you Andy. I have finally received not one but two from China (the first one was lost then miraculously found). Just about to connect it all up and your videos have been a tremendous help. Cheers from Spain.

[@wideawaketotruth5301]

Would be unable to setup without Andy's help!

[@rocketfuel-]

After watching many videos of your chanel, i eventually decided to buy this BMS for my 80ah 7s li-ion battery that i've got from an electric stacker (the BMS was dead so they gave me the battery). Thank you for sharing your experience.

[@OffGridGarageAustralia]

Thanks. I've just installed this one permanently in my battery shelf. It works great.

[@evil17]

I really like how the active balancer was still working 2A in one cell when you did some bms shutdown limit tests too. Good info n vid. I have Iphone, so I hope the App is as good as this one of urs. Thanks for all this great info Andy.

[@OffGridGarageAustralia]

Thanks Evan. I believe the app is the same for iOS and for Android.

[@microbiologycory10]

So this BMS is completely configurable through BY from iOS or Android…mo PC with Termite required?!? If so, take my money! Could you provide link to ENG user manual?

[@wideawaketotruth5301]

Supper Nice BMS! Couldn't setup without your help!

[@joselito7776]

It is through this invaluable video that I found out how to turn on the BMS without that dratted switch which has to be bought separately here in the Philippines. Thanks for this.

[@davidswiggum]

So I bought one. Came 2 days ago. Installed no problems. Started with 6v battery. Worked fine. Balanced my battery on first charge cycle. Excellent product. No more Daly. Thanks for the video.

[@OffGridGarageAustralia]

Hey, that's great feedback. The internal balancer is amazing, right? I really like the functionality and ease of setup.

[@jcreedy20]

Hey bud, just curious, I'm looking at both the Daly and JK bms to replace my ANT BMS on my ebike due to the inadequate balancing force and the fact it is passive on the ANT. What is better about the JK over the Daly? I am looking to run 250 amp peaks. Nominal will probably be around 100 amps at cruise velocity. Will the 200a JK do 250 amp peaks??

[@upnorthandpersonal]

I've been running two of those for the past year without issues. Probably the best BMS in this price range one can get.

[@mrzed6597]

You helped me start my unit a long time ago :) Still running without problems. Thanks ;) I fear the price of this unit will go up like a Falcon rocket now :)

[@upnorthandpersonal]

@@mrzed6597 NP :) I vaguely remember. I've done so several times for other people as well on the forum - at least there appears to be a manual in English floating around now. There should be enough vendors out there to prevent too much of a price hike. That said, with component shortages worldwide as they are, that might impact pricing as well.

[@mrzed6597]

@@upnorthandpersonal I fear it will be like the cells. A year ago EVE 280Ah was $1800. Now it is $2300 (for EU). More demand, higher prices.

[@Sanwizard1]

I agree with up North and Personal. I have two of these running now perfectly for quite some time.

[@Sanwizard1]

@@upnorthandpersonal is there a direct link to EVE?

[@offgrid2010]

Wow. You actually show all the features working instead of most posters assuming all the features work. Very much appreciated!

[@upnorthandpersonal]

Power off voltage is the voltage at which the BMS itself turns off to prevent slowly draining the battery.

[@mrzed6597]

Funny side note: the very expensive LG RESU 10h does not have it (or set too low). A unit's battery was completely drained when it was 1,5+ years in a storage. Lithium batteries loose max 3% SoC/month.

[@OffGridGarageAustralia]

Ah, right.. that's a good tip, thank you. Makes perfectly sense. So turn off voltage will turn of the BMS once one cell hits this voltage?

[@upnorthandpersonal]

@@OffGridGarageAustralia Yes, exactly.

[@brettwilliams6728]

I immediately bought one the other night after you posted this video. Just have shipping confirmation today. Thanks for the recommendation. I look forward to another video about what you learn about this.

[@OffGridGarageAustralia]

Coming soon. Don't be scared by the next video though 😌

[@jwsolarusa]

Please share the link with us

[@OffGridGarageAustralia]

@@jwsolarusa it's in the video description...

[@excillisbank2611]

Ce BMS est étonnant et incroyable ! je ne savais pas qu'il existait c'est vraiment un BMS HYBRID et très complet.

[@sergea1138]

Pas si complet, Il est bien mais il manque la gestion de la résistance de pré-chargement et impossible de gérer plusieurs bms sur la même interface rs485.

[@hugodeandres1497]

Dont forget Daly BMS’s are widely used. It is all i can ask for to use in my 14s e-scooter. Its 12Ah and peak output of 18A. It doesnt need anything too fancy

[@tomtebloss89]

Had really hard to find a good BMS, i needed minimum 120a x3 and overkillsolars is only 100a. So I just ordered 3pcs 150A of this BMS to my first off-grid planning (even stocked in Poland :) . Thank you for reviewing different BMS! /Greetings from Sweden

[@markmorris6357]

Andy, I've learned more from your videos than from any other source. Carry on!

[@OffGridGarageAustralia]

Thanks a lot Mark!

[@rudisoft]

Based on your review, I bought two of the JK-B2A20S20PHC (maybe I'm destroying one, yet better to have two than needing one). Thanks for your work!

[@The2000redrocket]

Hi there I just got the new jk 200a with the display. It only has a red and black wire on the cable not hooked to anything. You connect these momentarily to start it. That was nice. The cable going to the display does not have the 12vdc power to power the display. I'm using alligator clamps across 4 cells to power it. And it is mostly in Chinese so I asked if you can change language somehow on it. It was 29 bucks. With the app I think it is not really a got to have item. The app wouldn't see the bms. So I had to go in my phone app settings and give it permissions. Then it worked. This is the 2a 24cell 200a I'm using on 8cell batteries so I had to get a 24 to 48v boost to power it. All in all I think this is a great device. I'm glad I got it. Nowi have to fully charge and draw it down to get the meter calibrated.

[@timburk6097]

This seems to be the one! 8s available now also! Awesome! Thank you.

[@fionnhovawart9594]

8S, I can't find it on their site. BMS starts with 14S LFO..

[@MiguelSilva-mb6mb]

Yes, Finaly a great BMS - Just like mine. You will love this!!!

[@OffGridGarageAustralia]

I already do!

[@victorrizalfilosofi]

Just recieve the item today Thanks for the detail video Sir!

[@trevornelmes9331]

Just in case, like me, you have a BMS already and simply want the equivalent Active Balancer, JK also sell the same thing but as an active balancer only. If you already have your battery assembled and taped up, they also have an adapter board that you can plug your existing BMS wiring into from the battery, the adapter goes in to the active balancer, and has ports to cable to your old BMS.

[@OffGridGarageAustralia]

Ah, great information Trevor. Thank you. That's very good to know. Such an adapter makes a lot of sense.

[@Dutch_off_grid_homesteading]

Heya, oke oke that looks like a very good bms can't wait for the next vlog with testing this bms I still need 2 bms's

[@DanBurgaud]

27:07 "... the only i have not seen here is a pack overvoltage..." You are correct that to get to that pack overvoltage, it needs to reach cell overvoltage first. What I am interested is an overvoltage from the "source" wherein BMS disconnects itself from the SCC if incoming voltage is too high

[@reversemyopia]

I can't thank you enough for making this useful video! My hesitation to build my own battery have been solved

[@OffGridGarageAustralia]

Thank you very much. Good luck with your battery build.

[@NounXXX]

​@@OffGridGarageAustralia📌 *Есть мысли, чтобы при отключении городского 220в, автоматически включалась JK BMS* ❓🤔 В Щитке стоит АВР

[@user-ty9lt4ck6c]

Dear Andy, for LiFePo4 this particular BMS (and as far as I can see all from this line) in fact CAN be used for 8S setup. LiFePo4 - from 8S, Li-Ion - like from 7S and LTO - yes, from 12S onwards). This is taken from specs page on Ali.

[@AlexanderBurgers]

It even works with even lesser cell counts but then you need to supply it with an external 12v supply to the B+ pin on the balance connector.

[@kondalaruthala3624]

Andy, Nice to see your channel. Very good

[@OffGridGarageAustralia]

Hey, thanks

[@wizzie2k]

Of course we want more testing and we love the looong videos!! Keep it up Andy and don't forget to calibrate in between ;-)

[@OffGridGarageAustralia]

Thank you. I tried to keep the video shorted but it's just toooooo much to show 🍻

[@mrzed6597]

Also known as JK Heltec BMS. As we said half a year ago it is the best product for these cells. You did a big detour, but at the end everyone comes to the same conclusion :) There is a big thread about this BMS on Will's forum. With the description how to start it with 5V using a lab power supply. Also RS485 communication with RasPi.

[@CROSpunkie]

Do you know of any US resellers that stock these?

[@mrzed6597]

@@CROSpunkie Sorry, I am from EU. So I do not have a clue :) I ordered directly from China.

[@arhitektche]

link please

[@SuperRoytaylor]

Where is wills forum

[@OffGridGarageAustralia]

I knew about these BMS' for a long time already but I also wanted to explore other options, like the Daly and the QUCC with relay, the active balancers and smart balancers. All this all in one unit makes totally sense.

[@chevaliercognac8757]

Thank you for your very useful videos!

[@kyba74]

The only possible issue is that all mosfet based BMS, if they fail (IE due to high voltage spike from broken solar charge converter), will fail with a short. Thereby allowing full access into the battery. For that reason I'd be more inclined to use a BMS with a separate contactor

[@OffGridGarageAustralia]

Yeah, OK, fair enough. The BMS should be the safety device for the SCC. If the SCC fails, the BMS should turn off. So you mean we would need a third instance of safety. Something like SCC->BMS->contactor?

[@mrzed6597]

@@OffGridGarageAustralia There was a case on the forum where a 24V SCC got into short allowing the PV 100V 10A directly to Daly 24V BMS (FET's shorted too) and to the LFP cells. Cells bloating, magic smoke released. Since then we are searching for a cheap preventive solution to this possible battery killer error.

[@stevenbraun3115]

I am using the LTT version of the QUUC. It has the black internal relay. The application is a 48V golf cart. I have LiNMC batteries in a 14s configuration with 135A. I also have 300W of roof top solar feeding a Victron 100 20 MPPT, a Victron BMV 712, and a built-in 15A battery charger. The BMS has been an absolute nightmare. I think it's defective. I cannot figure out how or when the relay works. I have ordered the JK BMS.

[@GREGGRCO]

No !! A real metal case ?! Crazy talk !😂 Our great grand children will have no idea what we're talking about ! My first good laugh of the day ! Thanks !!

[@OffGridGarageAustralia]

I know, it sounds, crazy, right?! 😂

[@SolvoltDkwebshop]

You talked well about these jk-bms and I bought 3 pcs. I ordered jk-b2a24210p and got sent version with rs485 plug in. I assembled them correctly with the balance wires which are all measured through. Put bms on negative. And put laboratory power supply with negative on bms-out wires and positive on battery plus, and with more than 5V difference, bms does not start. What am I missing in my understanding of how this works? Is there a difference between the versions of jk-bms?

[@arrongrist868]

I like the opening few seconds of the video, very funny. I think a lot of people will not get it unless they or their offspring have played the game. 😊

[@camperman759]

This calls for a few more beers on me. I like where this is going. Keep up the good work my friend.

[@OffGridGarageAustralia]

Thanks a lot for donation, Ron. Much appreciated!

[@jamesattwood6809]

Great Video Andy! Appreciate detail - and if a video runs long it means more detail, more learning and more knowledge shared. Just bought this BMS on your recommendation. I would really like to see a video on simplified starting procedure (using a 9v battery for example). I have visions of a tiny 9v battery just exploding with the wrong hook up lol!

[@arturkarwowski1163]

Andy you make great videos, can you tell me if it is possible to connect this BMS via RS485 connector or some other way to Victron inverter or other inverter it is about JK BMS communication with inverter ?

[@Beyondreality76]

An important point for the JKBMS setup is the voltage calibration. Measure the voltage exactly at the battery connectors and set this voltage in the BMS-Setup. The BMS works well in total but the SOC finding is a mess. Why the did not make an entry to setup the SOC in the setup menue manually? Daly BMS has this option and it is more favourable to enter or correct SOC from time to time.

[@ahlidap]

I own a JK Smart BMS and I'm super happy with it so far... Highly configurable, no need for extra messy wires for balancing... I just think that, for big packs, they could allow fir up to 5A balancing and, of course, thicker cell wiring. Just hope they keep updating and supporting!

[@tukorcan]

thanks for help .

[@basspig]

Mitechguy at Treeline power system says to hook a 9-volt battery momentarily between the B- and the black lead to turn on the b m s.

[@longdistancerider691]

hi, could it be that the energy dump intermediates, just happen to charge capacitors and then discharge into the lowest cell ?

[@MrSebastjan1973]

Hi, one question. Do you think you can connect this JK BMS to the Victron GX device via CANBUS?

[@fabienlabricole1774]

hello, should we put a discharge circuit before switching the BMS on the inverters? Thank you

[@PRASTRO]

🎉🎉🎉🎉🎉🎉yesssss now you are in shape, I was waiting for this video since you started, I have 4 years working with this BMS and not a problem at all there are the best for your needs, congratulations 🎈🍾🎉🎊 you finally find the one 💪🏼💪🏼💪🏼💪🏼

[@charlesrichards5389]

4 years? Jeez, now I feel like I've been living under a rock.

[@OffGridGarageAustralia]

Thank you. They are on the market for quite a while. Good to hear they last a long time.

[@dave3005]

The B2A24S20P specifications now state that it will work from 8S-24S for Lifepo4 batteries.

[@OffGridGarageAustralia]

And it should also work for 4s/12V systems with a small booster installed. I'll test this soon...

[@dave3005]

@@OffGridGarageAustralia I just placed an order for this based on your tests. Should arrive sometime around the first week in November. Thanks!

[@basspig]

I'm guessing that this is a bi-directional be Ms. In that there are separate charge and discharge on off selectors. If I turn on the discharge I get voltage at the output of the DMs I'm assuming if I turn on the charge that they will accept a charge from the solar panels. Anyway I think I'm going to like this PMS I have three of them and I have 3 16 cell 280 amp power banks that I'm wiring up right now.

[@glenb1356]

I just got my JK BMS with 1A active balancing. I charged the pack and the status display is great. The charging shut off like it should at 4.2V (NMC 140Ah pack). But, I have one cell at 3.65V. It seems to me that a 1 amp balancing capability is going to take a very long time to fix my half volt imbalance! ???

[@willgeorge5644]

I want to do a test like this on the BMS from a Nissan leaf, many available from scrapped battery backs. they are set up for li ion of course, but maybe that can be changed? I am interested in the operation principle. I think it may not be just a shunt one. I do have the circuit and there are some unexplained inductors and other components on each cell.

[@traviswansai2784]

The itching question concerning lifepo4 battery banks. What Balance current should really be required for a battery pack using brand new 100, or 200 amp hour batteries. And, What balance current, or cell voltage spread would be considered to be too much during charging/discharging that would indicate a bad cell. I looked at the EVE 105Ah specs yet no recommendations were found. Andy you have a great deal of experience in this area, so any recommendations would be helpful... Thanks.

[@juancazorla3746]

Hi Andy, are you sure a 2* 7AWG or 10-16mm wires can stand 200A charging or discharging continuously?, Would it be possible to replace those 2 wiring for 1*50mm or 2*35mm?, Victron is recommending thicker wires for that current than Chinese Manufacturers :S. Good video review btw :)

[@mandimandi2523]

Hi Juan! I did not use the short pieces. i replaced them by 2 times 16mm² equal to about 35mm² and continued after 15cm with the 35mm². i agree that the 200 A is very optimistic. 35mm² single cable can be charged with 160A according to german standards. I am also not sure whether the bms can withstand 200A/350A... and honestly i would not do .... i would limit the input/output to 150A... Compared to the DALY 200A BMS the JK is tiny ....

[@Refertech101]

As some one who does power systems and off road equipment I can tell you, all ways crimp and solder! then double wall heat shrink!

[@gyulakun7346]

Hi Andy, I really like your videos, congratulations. I have a question, do you think the JK BMS with integrated active balancer can be configured for a lead acid forklift battery? 48V 775Ah. Between what values can the cell voltages be set? The main thing would be the monitoring, but if the active balancer also worked, that would be very good. I wish you good health from Hungary. Regards: Gyula

[@honeykethan]

Sir Nice video ! What happends if both Charge and Discharge is on simuntaiously, As I can see both turned on in the app @30.05 Can we connect it to one power source and Load at Same Time

[@francispomares8786]

hello. More than a year ago I had the bms of the video JK b1a24s-20p but I changed the keys and now I don't remember what it is. Do you have any information on how to recover it or some way to reset the BMS ... thank you very much

[@Earlonics]

Hi Andy I've been using what looks like the same BMS (JK BMS) for over a year now, works a treat, the only pain is having to have 3 volts above battery voltage to switch the BMS on. Once its on it does stay on, the reason I got this one is for the 2A balancing, my other one was balancing too lower amperage.

[@OffGridGarageAustralia]

I'll have to figure something out in regards to the start voltage. It's not ideal having that but manageable. The BMS seems ideal as it combines a great BMS with an active balancer.

[@rocketentertainment7403]

Yup, im running into that issue consistently :( today, i just cant get either bms to turn on at all

[@bstaab2590]

@@OffGridGarageAustralia Was this topic followed up here! Or are there updates on the part of JK that enable switching on through another function?

[@OffGridGarageAustralia]

@@bstaab2590 That has been sorted with an upgrade on the BMS. It now comes with a start button and a display. I tested the 4S version with display here on the channel: kzbin.info/www/bejne/gnXEnaF5ZZaAkKc

[@microbiologycory10]

Is the new version with start button and display only available as 4S version (that’s the only link on website). If not, can you please provide link or part number for 12S+ with start button?

[@sreekumarUSA]

092521/1608h PST 🇺🇸 092621/0908h Brisbane 🇦🇺 Good day to you, Andy. Thanks much for exhibiting relentless quest for perfection. But for me, my CNS got hay wired and I’m in total confusion. Don’t worry, it’s my intelligence or the lack of it. I do really appreciate the mirth and the technology mixed together from Brisbane. Take care, Sir; please continue your quest, research and results for the public. Errr.. I saw a glimpse of Oettinger ! Have a nice weekend and 73s…

[@uddemannen]

Is it possible to adjust max amp out? Bought a Daly but ordered wrong and now I'm going to buy something else and ran over this. I'm building a off-grid solar wind power in my cabin and I'm away at work every other week and that would be perfekt for active balancing

[@amagro9495]

Hello Andy. What's your suggestion about this: I'm top balancing 8 272Ah cells. The typical method is, first put them in series with a bms and charge to 3.5v; second connect them in parallel and charge till 3.65v. Since I have a JK BMS with 2A active balance, should I leave them in series and wait for bms to balance them, or should I connect them in parallel and let them reach 3.65v?? Tks

[@ianpope7061]

Just a qery, is the Cell/Wire Ressiatnce could be measuring the internal resistance of the various cells??

[@_JustBeingCasual]

@Off-Grid Garage what size did you use to mount those ring terminal on the JK BMS cables, would that be a SC10 or SC16?

[@jkbms9549]

谢谢你选择JKBMS你讲解的很好

[@stelucostache5827]

Hello I watched your videos with BMS settings for 48v 280A batteries. I would like if you could tell me what the working voltages of the battery would be at a percentage of 20% and 80% respectively. Thank you

[@GerryMitchell-sg3dd]

I have watched many of your videos concern the BMS and active balancing. I am building a 230ah battery pack for a Polaris EV. I started with a Daly 500a BMS and it fried internally. I ordered another and it works but it doesn't read the cell voltage correctly which causes the charger to turn of prematurely. I have been in contact with Daly and they tell me it needs a firmware update. I cannot get my computer to communicate with the BMS. This is very frustrating and Daly is little to no help. I have wondered if adding an active balancer like NEEY could help with this problem. I'm really tired of wasting money with Daly. What BMS do you recommend to be the best all around?

[@diysolaradventures7894]

Andy JK BMS have 4-8S versions of that same bms for around a $100 bucks on eBay I believe

[@briannoakes1789]

Hi Andy, great channel. Slowly making my way through your EVE cell/JK BMS videos. I was wondering if you have made any progress with enabling the CAN/485 interface to control Victron CCs and Multiplus IIs? I know you have the Rasp Pi, but like many others I have a Cerbo GX. Do you think the Cerbo will work with the JK at some point? Keep up the good work!

[@bonnetalexandre2085]

Hello 👋 Good video i wonder 1 thing, why don't you balance under 3.4 v ? Thank you sir

[@scotthenderson4376]

I will be building my 1st pack using this BMS and have a 24v 16 amp power supply with a ISDT Q8 Battery Charger/Discharger, Balance Charger Discharger 20A 500W DC 2-8S , I also ordered a 0-12v 60 amp power supply (that's supposed to go up to 60v but not hopeful) question is do you think I will be able to wake up the BMS or should I get a 60v 5 amp power supply like yours? The pack will be hooked to 4k of solar when all said and done.

[@samornprapruet5300]

Hi Andy , From Thailand here. I have a question about JK bms on the screen had been show up Protection was “Cell Over Voltage)(OS)”. Also Bms had many time cut off then make Inveter isn’t working. How can I fix this problem? Please,Can you help?

[@BrianCook-dc8pz]

Hey Andy, will this JK bms work with my 12kw inverter that does not have communication protocol? Is it necessary to communicate with the inverter with this bms. Thanks for your videos. I am learning a lot and I'm in the process of building two 48v batteries very soon.

[@jetspeed81]

Great Video, one question, in Version 10 of this 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

[@philippesteindl3356]

Silly question: If oyu use the display of the JK BMS (which needs 12V I think) .. how do you get those 12Vs off the whole solar setup ideally? From the Battery Busbar with some 48V->12V converter?

[@OffGridGarageAustralia]

Isn't the power for the display not coming from the BMS directly?

[@ianpope7061]

I notice JK now supply 5A and also 10A balancers. When would you consider such substantially more capable balancers?

[@mathewemy]

Thanks

[@frankseidinger2112]

I liked the part where the Oettinger Pils is the solution of the day :-)

[@boringsoftware2093]

THANKS GERMAN AUSSIE MAN 😎👍🏻🍺☕☀ IT ACTUALLY HELPED ME A LOT :D AS THE MANUAL IS CRAP! AND THEY KEEP CHANGING EVERYTHING! HINT: APP ONLY WORKS IF U SEND YOUR GPS LOCATION TO CHINA! (it will not find the JK BMS via Bluetooth unless LOCATION SERVICE (GPS) IS ON AND IT U ALLOW THE APP TO USE IT)

[@diysolaradventures7894]

Do they make other models of the JK bms for 8 cells in 24v ? I've seen so many different ones I just want to make sure I get the right one

[@KoiAquaponics]

What's a good monitoring LCD screen for this? Need to know how much battery is left at time without bt app

[@stoptheirlies]

Andy, good video, mine arrived and has two extra sockets but I can't find information as to what they are? Also there is a RS485 module it has the plug to connect to the BMS but the other lead has no plug on it, what plug should be connected, there is zero information, if this module a RS485 to USB? if so why did they not put a USB plug on it? can you help please. Bob

[@GavinWallace18]

These Videos are FANTASTIC and made me start to design my own system. I have a question from Scotland though; Will the JK BMS work with the Multiplus 2 directly without a shunt? If so, how does the MP2 know the state of charge of the battery? Many thanks Gavin

[@OffGridGarageAustralia]

Thanks Gavin and welcome to the channel. Yes, you can just operate a battery, a BMS and the Multiplus II without a shunt. The Multiplus II will measure the battery voltage itself and disconnect if the battery is empty. No problem with that.

[@GavinWallace18]

@@OffGridGarageAustralia This is good! however we still would like to know whether it will display the battery charge percentage when connected to the raspi Venus OS using a mk3-USB interface? We are keen to know the State of Charge at all times. Thanks for your time 😀

[@GavinWallace18]

Any thoughts on the above Andy?

[@OffGridGarageAustralia]

@@GavinWallace18 I don't think it will display any SOC or battery state without a Victron battery monitor or shunt.

[@supernovatiger8913]

Thank you man , i wonder if it provides historical consumption data ?!

[@cotandiet6096]

Hi Andy, does it hurt if you add another 5A active balancer on top of JK-BMS?

[@ai4px]

Does this bms do a soft start when first turning on?

[@williamriley3125]

i was laughing so hard when you pulled up that diagram with the 5v battery..like what?? lol

[@deanrowles3665]

Hi again Andy, Have been googling but cant find anything. Do you by any chance know a link to a wiring diagram, having trouble working out the 2 black wires on each battery connection plug. Thanks

[@simonguest1890]

Hi Andy. Has it a cold temperature protect like -20 degrees? Or just overheat protection?

[@OffGridGarageAustralia]

It has both, you can set limits for high and low temperature

[@simonguest1890]

@@OffGridGarageAustralia thank you very much!

[@markkeane4094]

When it comes to automation like charging from grid at night, is this BMS ok or helpful?

[@legominimovieproductions]

I'm planning to buy the 200A/2A jk bms with rs485 for my battery pack, just waiting for a couple videos/reports on how they perform (are they really as perfect as they sound)

[@OffGridGarageAustralia]

Yes, the JK is very good. Most people use them these days for batteries from 4s-16s and beyond.

[@legominimovieproductions]

@@OffGridGarageAustralia I will buy 16 Eve 280Ah cells. I am just unsure about the whole Minus-disconnecting problem with victron, I already blew 2 cerbos because I managed to create a rare special condition

[@eduardoperez891]

Dear Andy. I'm ready to star my JK BMS, how could I find your instruction video for parameters settings and values. I will like to follow your instructions.

[@kajakmannen1666]

Very interesting! Im a bit confused with this active balancing thing. Isn't that the whole point with using a BMS to make sure the batteries always are balanced? Or is this a special feature for this BMS? If so, do you really need to top/bottom balance the batteris prior to use? Im planning to build a 24V 8S system for my cabin. The idea is to build two 12V 4S batteries (with individual BMSs) and then serial connect them with a battery balancer in addition. The reason for this is that I want to use one of the 12V 4S battery for my camper van while on the road and the whole 24V 8S system while back in the cabin. Anyone out there with this setup, or would you recommend to use just one BMS that can handle 4S and 8S configurations, like this BMS?

[@OffGridGarageAustralia]

Yes, the active balancer is a special feature of just this JK-BMS. It makes it outstanding and it works great. A top balancing is not really necessary but it could take a while until it's fully balanced. So, I would recommend to do at least a rough top balancing, say charge each battery to 3.6Vonce before putting them together i series. If you add 2x 12V batteries in series, make sure the BMS for each 12V battery are designed for a series connection. That's an interesting setup you have planned there. Not sure if you get a large enough balancer to balance these 12V batteries against each other when you come back from a trip. One could be empty and one full. I think it better to build one 24V battery for the cabin and one 12V battery for the van. There is no BMS which can handle that unless you change all the parameters constantly.

[@kajakmannen1666]

@@OffGridGarageAustralia Big thanks for your reply. I have reconsidered this and think I will go for one 4S-8S BMS instead, like the JK, and then use it in 4S config while in the van and 8S while in the cabin. I know, it sounds complicated and require some changes in settings each and every time but as long as I leave the batteries fully charge in the cabin and make sure the 12V is fully charged prior to combining them again it should be fine, right? :) Alternatively I'll use the JK 8S BMS in the cabin only and then another 4S BMS for the van. I just want to avoid buying 12 cells instead of 8. Lets see, if I find it too complicated I'll probably end up buying 4 more cells in addition:) By the way, I really like your channel.

[@OffGridGarageAustralia]

@@kajakmannen1666 Thanks, Ivan. That sounds indeed complicated what you're planning. Well, I guess, it depends on how often you need to change this over from 4S to 8S and back again. You may get sick of it very quickly or very good and quick in changing all these parameters over and over again 😂

[@kajakmannen1666]

@@OffGridGarageAustralia Complicated is the word! :) I'll probably buy two 4S-8S BMSs to avoid parameter setting hell. Then I always have one in spare as well.

[@tobiaskabisch6081]

Moin Andy, schöne Grüße aus Schleswig Holstein. Ich hätte mal eine Frage andich bezüglich des JK BMS. Meinst du dieses könnte man auch für einen Rasentraktor Elektroumbauprojekt benutzen? Du hast ja auch schon die beiden 7AWG Kabel als Nadelöhr empfunden, und bei meiner geplanten Anwendung wären 80A Dauerbelastung realistisch. Ganz am Rande, dein Kanal hat mich dazu bewegt auch ein Solarprojekt ins Auge zu fassen. Nulleinspeisung mit Speicher und dann über die Sun GridTie Inverter. Herzliche Grüße Tobi

[@450kman]

I've had 4 of the jk b2a24sp running with no issue, with Growatt and SolarAssistant for more than a year, but now one of the units refuses to communicate via rs485. Ideas?

[@KmanAust]

I have questions. You say it has RS485. What control do you have of the unit via RS485? Are all functions controllable. Does it report all values of batteries etc?

[@OffGridGarageAustralia]

I'm not sure yet. But I suspect it will report all values to a central unit which then can throttle charging through the solar charge controllers if the battery gets full. We will find out, Brad is working on it...

[@KmanAust]

@@OffGridGarageAustralia Oh OK. Im not sure who Brad is but I guess I'll find out. New to the channel :D

[@Rocky-52]

One question How do you mount it? No screw holes or frame. Using cable ties wouldn't be a very clean installation.

[@OffGridGarageAustralia]

That is a very good question... Thinking about it since I got it 2 months ago...

[@_layer8]

Hi Andy! Greetings from Germany! Can you tell me what USB interface you are using to connect the BMS to the Raspberry Pi?

[@OffGridGarageAustralia]

Hi Dominik, I haven't connected the BMS to my Pi yet. You can just us the Victron USB -> RS485 or Victron USB -> Ve.Direct cable. Have a look at Louis's project on Github: github.com/Louisvdw/dbus-serialbattery/wiki

[@_layer8]

@@OffGridGarageAustralia Thx Andy! Just made my order to "Dongguan Jiyuan E-Commerce Co., Ltd.". Ordered the 200A version with LCD and RS458 interface. Will post my experiences here.

[@blackterminal]

I am doing an electric car conversion and I am looking for a bms to handle two rows of li ion batteries in parallel. Each row is 3x 12s modules. The Orión BMS is very expensive. Is there any Chinese BMS you are aware of that would fit my needs?

[@OffGridGarageAustralia]

Maybe look at the QUC BMS with 4 relays. It can handle a lot of current and is also designed for mobile applications. Got a link here on my website: off-grid-garage.com/battery-management-systems-bms/

[@columbboss7530]

Hello. A link to the application you're using? Thanks

[@andreaswestling259]

Does JK have any of their new BMS supporting 4S setup? What would you recommend for a 4S Setup otherwise?

[@OffGridGarageAustralia]

No, the new inverter BMS is only 8s-16s. For 4s, go with the older JK-BMS. It's the best on the markt still.