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 ! 😇🙏
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.
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.
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.
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?
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.
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.
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 :)
@@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.
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.
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??
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.
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.
Have u attempted the cascading feature to use 1 device for a 14s 7 p, configuration? multiple strings in parallel??? 1 device! i am having difficulty understanding the wiring schematic in the manual. Have been looking for a couple of years now; on youtube, and no one else has shown how they do it!!!!!
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
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?
@@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.
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.
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
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.
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.
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.
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.
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.
🎉🎉🎉🎉🎉🎉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 💪🏼💪🏼💪🏼💪🏼
Thanks for the video! I ordered this BMS after viewing your video a couple of years ago. My batteryproject has been delayed until now. So today I will start installing my JK BMS (JK-B2A24S15P). AND you helped alot so I will not get stuck with a BMS that would not start ;) Thanks to you I do now know the +5V start-trick :) My battery is a 20S33P li-ion battery that I have built for my electric moped.
Hi Andi, which BMS is now the best you ever got hands on and tested for a 16S large capacity battery ? and which active balancer is the best you ever got hands on and tested for a 16s large capacity battery ? as there are 12A active balancers popping up on the stores now, did you also have a chance to test one of those ? Grüsse aus München (und ich denke ich darf dir auch Grüsse von Christian (der Kanal) ausrichten) 😜
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 !!
Yes, me too. Seems like I have to do this test at some stage with my the battery banks. But not connecting it to an inverter but the Victron system for monitoring purposes. Inverter connection makes makes no sense in my eyes...
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
Yes, they do. Brad is working on this at the moment and I will announce it her on the channel if he gets this sorted. He's working on solutions for other equipment as well, DALY, QUCC BMS' and other than Victron gear.
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.
Yeah I had a totally different brand and type too where you needed to use a multimeter on diode tester and connected across the b- and p- to get the BMS to turn on after you first connected the balance leads
I've seen some where you just short b- and p-, and others that have a separate trigger wire to touch 5v to turn them on. I suspect this one can be triggered on by doing what they said at 12:55 (touching 5v across b- and p- then connecting the battery) which would usually fry a BMS but this one seems to be made for it.
For this JK-BMS app, is there only one balance circuit at a time as indicated by the red and blue illuminated cell voltages? How many simultaneous balancing circuits does this active balancer have?
I noticed two more things: 1. At 4:34 you show that it has a Coulomb Counter! So, no more need for a shunt? 2. At 20:14 you show that you can enter the wire resistance for the sensor leads. DMI INC (in another thread) suggested that the resistance of wires (and terminals) could contribute to shunt "drift". If you're pushing 2A though long skinny sensor wires, I could see how that would be possible, and it's awesome that there's now a way to compensate for it!
I have to see how good the shunt is. The Victron smart shunt integrates nicely with the Victron gear. To integrate this BMS, it needs a bit more tweaking. Brad is working on a solution...
From my understanding, when voltage drops below 2.6V, it turns off the discharging MOSFET, but it is possible to automatically recover by charging to 3.0 V. When voltage drops below 2.5V, the BMS shuts itself down to minimize battery drain. It will need the Vbat+5V power supply trick to restart.
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
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 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
Does using a BMS with active balancing negate the need for top balancing when building a new battery pack. Wouldn't the BMS top balance the cells when plugged into a charger?
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
Could you open it up and check the quality of cable connections to the BMS and what kind of cooling they have those MOSFET's? Thanks. I have older versions of active balancer and they work great.
I will open it and check that. The cooling is not too important as the internal resistance of the FETs is only 0.3mOhm. At 200A, that's only 12W of heat generated.
@@OffGridGarageAustralia True. However, one has to take into the account quality of solder job on those wires (which is wrong execution of how to attach wires to begin with) and fact that we are dealing with lowest cost china made FET's. Love the thinking behind this product and have been looking at these BMS/Balancers since last December but 7AWG wire and its attachment to the board has me bit worried. Looking forward to your next video. Thanks
@@DMIINC2013 I wouldn't be surprised if this has Infineon or International Rectifier MOSFETS in it. Low RDSon MOSFETS are not that common, and even my low cost inverter had these in them. I remember opening the BMS as well, I just don't remember the FET they used...
One thing to know about active balancing that is often missed if it’s not done correctly it can cause extensive wear and damage to cells. I would stay away from it unless you know it’s done properly and purchase a separate unit
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.
Hey Andy, that BMS is very similar to the BMS on my electric bicycle setup. The resistance is really nice, because my bike battery is made from used 18650 cells, so I was able to learn about a high resistance and it protects the bank before it causes further damage. Also It needs start voltage to turn on also, but it turns on during the bulk charge cycle or in my case with the bank is low or dead, i am dumping as muck voltage as the 48v laptop charger can pump into it and because the charge voltage goes more than 5v over the bank voltage, it triggers it on.. and it starts doing its thing. The BMS on my bike turns off if you dont charge it after a few weeks, like something internally is ran off capacitor voltage or something.. but it turns on as soon as i plug it into the charger. The only time this bothers me is when the bank is 100% charged aand i have not charged or used the bike battery for a while, when i plug it into the bike, the BMS is not actively working at that point until i plug the charger into it again to charge it. Mine is like 30ish days it lasts before turns off..
Thanks for sharing, William. Yeah, I wonder how I can do it when I have the battery in place. Not that the battery or BMS will turn off often but the occasional disconnect can happen and I don't want to connect a power supply all the time to trigger it again. Maybe the external e-bike charger is enough though... needs more testing...
@@williamhustonrn6160 Hi, I received this BMS based on this video. So I have no clue about making batteries or connecting this stuff, and learning as I go along. My understanding is that I plug in the BMS and hook it up to the terminal where the charger terminal connects, when it's connected to the charger the extra voltage above 48v will activate the BMS? I also will be using my battery bank and this BMS in a DIY scooter. So I just need to make sure it works right. Thanks.
This is to start up the BMS the first time. Once it is running, it does not need that start voltage anymore until you disconnect the BMS again. The new versions of the JK-BMS now have a switch to turn them on. Link is here on my website: off-grid-garage.com/battery-management-systems-bms/
Has anyone here figured out a good way to jump start the JK BMS without an external power supply? I was hoping to avoid buying one since I only expect that it would be useful one time...
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?
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.
@@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.
@@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 😂
@@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.
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.
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
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! ???
Hello, Yesterday I put my battery pack into operation with jkbms. The temp. sensors are plugged in and enabled in the app. Unfortunately, no temperature (T1;T2;Mos) is displayed (display: NA). What could be the problem?
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?
Is there a device like this, but for two 12v batteries (24v system = 2x 12v)? Use cases: my UPS has two 12v 9AH SLA batteries in series and I'd like to balance them for longer life, passive balancing is ok. Use case #2 - I would like to balance the two 12V SLA series-connected batteries in a motorhome (24v system). I am aware of the Victron Energy battery balancer, but am looking for a much more economical solution. Just need a passive balancer that works when charging, not a BMS. SLA (sealed lead-acid) is what I'd like, but you can point me to an AGM too if there's a difference (pardon my ignorance).
The BMS can be connected to up to 24 cells in series. A 12V battery consists of 4 cells 3.2V each. You put them in series and reach the 12V nominal voltage. That's a 4s system, 4 cells in series.
Hi Andy long time since we spoke it was last year when I first talked to you about a few thinks iam the Kev from uk I still watch your videos and keep passing information on via my facebook pages that I have. I just wanted to ask if anyone else had same issues with the new jk bms 4to 8 2amp Bluetooth version you did a video about 5 months ago I think. Any way I ordered 2 from a Amazon seller very good service with delivery but had problems with information I have just received and just found some information on but not a lot on this version also having difficulty in finding the software to update to the latest version as I had same problem as you did when you started to use. The jk bms web site doesn’t have anything re software updates on have tried doing online search for this update not a thing. I have email via my phone ad ther website won’t send emails at this moment have reconnected the seller but I think it’s an agent. Dot know if you can help with a version of This software as I can’t get anything to work at the moment. Lol. I wanted 4 weeks for the 2 to arrive it did exactly on the day that they started but can’t build my two 8s 3.2v 304ah units until I can get this software. I was interested to see if others had same issues What I can see is a good build. But at this moment in time had to stop the build so frustrating. Lol Anyway Andy keep up the good work on your project. I watch your videos In batches. Usually when I can’t do anything Ch. from Kev in the uk
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!
@@bonnetalexandre2085 Yes, works fine without an additional external balancer. Try it first and if you cells are really that bad and won't balance, you can always add one later on.
Hi Andy, although this video is already 2 years old still very valuable. I'm currently setting up 2 48V batteries with these JK BMS's and found this video very helpfull. Thank you very much for this. But despite this I still have question left and that is regarding the size of endlug you mounted onto the black and blue cables. When I look at the diameter over the strings (5mm) the diameter of the lug should be more than 5mm. I would say 5.5mm which belongs to the size 16mm2 lugs. Do you agree on this? I would love to get your answer. Thank you for all the great work you are doing I learn a lot from your videos. Kind regards, René
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.
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.
@@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: ruclips.net/video/LDalnC01MZE/видео.html
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?
@@OffGridGarageAustralia Thanks. Would be interesting, and should be fairly easy to check :) I think it goes into some kind of deep sleep mode when there's no communication as well.
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
I contact JK about a bms and the told me a 500a bms was $180 but $140 shipping and a $30 wire fee. Do you buy from them directly and get this treatment?
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
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.
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
@@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.
Happy Easter from Canada Andy. With the Easter theme do you worry you will have all your eggs in one basket with the huge BMS. Could you not have two half banks with a switch to transfer either one in the case of a problem with the other.
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
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.
@@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 😀
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?
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/
I am looking at the aliexpress link you provided. In the title of the product it says 36V 48V 60V. But looking at the table data listing I can't find anything about the voltage. I want to build a 12volt 840ah battery with 12 280ah eve cells. I tried to send a message to the seller, but just got the same data that is all ready on the aliexpress site. Will this support this?
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 ?
Where it said maximum charge current 25 amps did u change that Andy to a higher charging current certainly ur charging with only 25 amps right I'm I missing something here ?
You have made sourcing and comprehending this topic so much easier.
Hats off to you Good Sir! 🎩
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 ! 😇🙏
Thanks a lot Gilles! Appreciate your kind words.
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.
Power off voltage is the voltage at which the BMS itself turns off to prevent slowly draining the battery.
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.
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?
@@OffGridGarageAustralia Yes, exactly.
Supper Nice BMS! Couldn't setup without your help!
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.
Would be unable to setup without Andy's help!
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.
Thanks Evan. I believe the app is the same for iOS and for Android.
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?
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.
Wow. You actually show all the features working instead of most posters assuming all the features work. Very much appreciated!
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.
Thanks. I've just installed this one permanently in my battery shelf. It works great.
Andy, I've learned more from your videos than from any other source. Carry on!
Thanks a lot Mark!
I've been running two of those for the past year without issues. Probably the best BMS in this price range one can get.
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 :)
@@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.
@@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.
I agree with up North and Personal. I have two of these running now perfectly for quite some time.
@@upnorthandpersonal is there a direct link to EVE?
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.
Hey, that's great feedback. The internal balancer is amazing, right? I really like the functionality and ease of setup.
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??
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.
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.
Ah, great information Trevor. Thank you. That's very good to know. Such an adapter makes a lot of sense.
Thanks
Nice 👍 thanks for sharing.This video is 2 years old now, why are thwy still selling separate BMS and activ balancer ?
Have u attempted the cascading feature to use 1 device for a 14s 7 p, configuration? multiple strings in parallel??? 1 device! i am having difficulty understanding the wiring schematic in the manual. Have been looking for a couple of years now; on youtube, and no one else has shown how they do it!!!!!
No, I haven't done this. But a 14s1p is not different form a 14s7p form the BMS perspective. All parallel batteries are just one battery for the BMS.
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
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?
@@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.
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.
Coming soon. Don't be scared by the next video though 😌
Please share the link with us
@@jwsolarusa it's in the video description...
Considering that 2 x 7awg cables have a maximum amperage of 30A x 2 = 60A how can it hold 200A in charge/discharge?
I have the same question. This is very strange for me. Does anyone ever tried to run this BMS ant max load? What is going on with the cables?
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
Danke!
Danke dir für deine Spende und Support!
Ce BMS est étonnant et incroyable ! je ne savais pas qu'il existait c'est vraiment un BMS HYBRID et très complet.
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.
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.
The B2A24S20P specifications now state that it will work from 8S-24S for Lifepo4 batteries.
And it should also work for 4s/12V systems with a small booster installed. I'll test this soon...
@@OffGridGarageAustralia I just placed an order for this based on your tests. Should arrive sometime around the first week in November. Thanks!
I can't thank you enough for making this useful video!
My hesitation to build my own battery have been solved
Thank you very much. Good luck with your battery build.
@@OffGridGarageAustralia📌 *Есть мысли, чтобы при отключении городского 220в, автоматически включалась JK BMS* ❓🤔 В Щитке стоит АВР
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.
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.
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.
Do you know of any US resellers that stock these?
@@CROSpunkie Sorry, I am from EU. So I do not have a clue :) I ordered directly from China.
link please
Where is wills forum
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.
🎉🎉🎉🎉🎉🎉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 💪🏼💪🏼💪🏼💪🏼
4 years? Jeez, now I feel like I've been living under a rock.
Thank you. They are on the market for quite a while. Good to hear they last a long time.
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.
Thanks for the video! I ordered this BMS after viewing your video a couple of years ago. My batteryproject has been delayed until now. So today I will start installing my JK BMS (JK-B2A24S15P). AND you helped alot so I will not get stuck with a BMS that would not start ;) Thanks to you I do now know the +5V start-trick :)
My battery is a 20S33P li-ion battery that I have built for my electric moped.
Hi Andi,
which BMS is now the best you ever got hands on and tested for a 16S large capacity battery ?
and
which active balancer is the best you ever got hands on and tested for a 16s large capacity battery ?
as there are 12A active balancers popping up on the stores now, did you also have a chance to test one of those ?
Grüsse aus München (und ich denke ich darf dir auch Grüsse von Christian (der Kanal) ausrichten) 😜
What is really important with solar is that the charge current is as high as continuous discharge current. Great find.
Both 200A for this one. Far more than I need.
Andy,
Nice to see your channel. Very good
Hey, thanks
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!
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 !!
I know, it sounds, crazy, right?! 😂
I would like to see an actual test of this BMS connect to inverter RS 485/can bus with more than 2 same BMS.
Yes, me too. Seems like I have to do this test at some stage with my the battery banks. But not connecting it to an inverter but the Victron system for monitoring purposes. Inverter connection makes makes no sense in my eyes...
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
It will be interesting to see if the RS485 port can be interfaced with the Victron products. Do the talk the same protocols.
Yes, they do. Brad is working on this at the moment and I will announce it her on the channel if he gets this sorted. He's working on solutions for other equipment as well, DALY, QUCC BMS' and other than Victron gear.
Can you give it a try and a feedback if it works?
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.
Yeah I had a totally different brand and type too where you needed to use a multimeter on diode tester and connected across the b- and p- to get the BMS to turn on after you first connected the balance leads
I've seen some where you just short b- and p-, and others that have a separate trigger wire to touch 5v to turn them on. I suspect this one can be triggered on by doing what they said at 12:55 (touching 5v across b- and p- then connecting the battery) which would usually fry a BMS but this one seems to be made for it.
Of course we want more testing and we love the looong videos!! Keep it up Andy and don't forget to calibrate in between ;-)
Thank you. I tried to keep the video shorted but it's just toooooo much to show 🍻
For this JK-BMS app, is there only one balance circuit at a time as indicated by the red and blue illuminated cell voltages? How many simultaneous balancing circuits does this active balancer have?
I noticed two more things:
1. At 4:34 you show that it has a Coulomb Counter! So, no more need for a shunt?
2. At 20:14 you show that you can enter the wire resistance for the sensor leads. DMI INC (in another thread) suggested that the resistance of wires (and terminals) could contribute to shunt "drift". If you're pushing 2A though long skinny sensor wires, I could see how that would be possible, and it's awesome that there's now a way to compensate for it!
I have to see how good the shunt is. The Victron smart shunt integrates nicely with the Victron gear. To integrate this BMS, it needs a bit more tweaking. Brad is working on a solution...
Does JK have any of their new BMS supporting 4S setup? What would you recommend for a 4S Setup otherwise?
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.
From my understanding, when voltage drops below 2.6V, it turns off the discharging MOSFET, but it is possible to automatically recover by charging to 3.0 V.
When voltage drops below 2.5V, the BMS shuts itself down to minimize battery drain. It will need the Vbat+5V power supply trick to restart.
Does it shut down if one cell goes below 2.5V? Is that a feature? Have you tested that? I'm curious...
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
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)
Yes, the JK is very good. Most people use them these days for batteries from 4s-16s and beyond.
@@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
Does using a BMS with active balancing negate the need for top balancing when building a new battery pack. Wouldn't the BMS top balance the cells when plugged into a charger?
Hmm, 200 A Dauerlast mit zwei parallele AWG7 käbelchen am BMS.....Ob das gut geht? 🤔
I have the same question!!!
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
Could you open it up and check the quality of cable connections to the BMS and what kind of cooling they have those MOSFET's? Thanks. I have older versions of active balancer and they work great.
I will open it and check that. The cooling is not too important as the internal resistance of the FETs is only 0.3mOhm. At 200A, that's only 12W of heat generated.
@@OffGridGarageAustralia True. However, one has to take into the account quality of solder job on those wires (which is wrong execution of how to attach wires to begin with) and fact that we are dealing with lowest cost china made FET's.
Love the thinking behind this product and have been looking at these BMS/Balancers since last December but 7AWG wire and its attachment to the board has me bit worried. Looking forward to your next video. Thanks
@@DMIINC2013 I wouldn't be surprised if this has Infineon or International Rectifier MOSFETS in it. Low RDSon MOSFETS are not that common, and even my low cost inverter had these in them. I remember opening the BMS as well, I just don't remember the FET they used...
One thing to know about active balancing that is often missed if it’s not done correctly it can cause extensive wear and damage to cells. I would stay away from it unless you know it’s done properly and purchase a separate unit
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.
Andy JK BMS have 4-8S versions of that same bms for around a $100 bucks on eBay I believe
can I connect in parallel two JK BMS (8s 100A)? I have two battery packs, 24v each with JK BMS. One battery pack contains 8pcs cells (3.2v).
Yes, you can parallel as many batteries as you like as long as they have the same amount of cells, chemistry and each battery has its own BMS.
Hey Andy, that BMS is very similar to the BMS on my electric bicycle setup. The resistance is really nice, because my bike battery is made from used 18650 cells, so I was able to learn about a high resistance and it protects the bank before it causes further damage. Also It needs start voltage to turn on also, but it turns on during the bulk charge cycle or in my case with the bank is low or dead, i am dumping as muck voltage as the 48v laptop charger can pump into it and because the charge voltage goes more than 5v over the bank voltage, it triggers it on.. and it starts doing its thing. The BMS on my bike turns off if you dont charge it after a few weeks, like something internally is ran off capacitor voltage or something.. but it turns on as soon as i plug it into the charger. The only time this bothers me is when the bank is 100% charged aand i have not charged or used the bike battery for a while, when i plug it into the bike, the BMS is not actively working at that point until i plug the charger into it again to charge it. Mine is like 30ish days it lasts before turns off..
Thanks for sharing, William. Yeah, I wonder how I can do it when I have the battery in place. Not that the battery or BMS will turn off often but the occasional disconnect can happen and I don't want to connect a power supply all the time to trigger it again. Maybe the external e-bike charger is enough though... needs more testing...
@@OffGridGarageAustralia if that bms is like my bike bms, as soon as solar starts to charge the battery it should trigger it during the bulking stage.
@@williamhustonrn6160 Hi,
I received this BMS based on this video. So I have no clue about making batteries or connecting this stuff, and learning as I go along. My understanding is that I plug in the BMS and hook it up to the terminal where the charger terminal connects, when it's connected to the charger the extra voltage above 48v will activate the BMS?
I also will be using my battery bank and this BMS in a DIY scooter. So I just need to make sure it works right. Thanks.
Everytime do we have to give 4 extra volts or is it only once at start?
This is to start up the BMS the first time. Once it is running, it does not need that start voltage anymore until you disconnect the BMS again. The new versions of the JK-BMS now have a switch to turn them on. Link is here on my website: off-grid-garage.com/battery-management-systems-bms/
Just a qery, is the Cell/Wire Ressiatnce could be measuring the internal resistance of the various cells??
Hello 👋
Good video i wonder 1 thing, why don't you balance under 3.4 v ?
Thank you sir
Has anyone here figured out a good way to jump start the JK BMS without an external power supply? I was hoping to avoid buying one since I only expect that it would be useful one time...
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?
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.
@@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.
@@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 😂
@@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.
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.
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
Hi, one question. Do you think you can connect this JK BMS to the Victron GX device via CANBUS?
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! ???
Hello, Yesterday I put my battery pack into operation with jkbms. The temp. sensors are plugged in and enabled in the app. Unfortunately, no temperature (T1;T2;Mos) is displayed (display: NA). What could be the problem?
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?
Is there a device like this, but for two 12v batteries (24v system = 2x 12v)? Use cases: my UPS has two 12v 9AH SLA batteries in series and I'd like to balance them for longer life, passive balancing is ok. Use case #2 - I would like to balance the two 12V SLA series-connected batteries in a motorhome (24v system). I am aware of the Victron Energy battery balancer, but am looking for a much more economical solution. Just need a passive balancer that works when charging, not a BMS. SLA (sealed lead-acid) is what I'd like, but you can point me to an AGM too if there's a difference (pardon my ignorance).
Ive always used my multimeter in diode mode for starting jkbms :)
Andy, sorry but something you don’t tell us amateurs; what does the 24S mean in the BMS title?
The BMS can be connected to up to 24 cells in series.
A 12V battery consists of 4 cells 3.2V each. You put them in series and reach the 12V nominal voltage. That's a 4s system, 4 cells in series.
@@OffGridGarageAustralia makes sense however I presume that the 24S means you can put any number of cells up to 24 but doesn’t have to be 24?
Is there any similar version of this bms for 4 picks battery 12v ??!
Yes, there is now a 12V version. Link is under the video.
Hi Andy long time since we spoke it was last year when I first talked to you about a few thinks iam the Kev from uk I still watch your videos and keep passing information on via my facebook pages that I have. I just wanted to ask if anyone else had same issues with the new jk bms 4to 8 2amp Bluetooth version you did a video about 5 months ago I think. Any way I ordered 2 from a Amazon seller very good service with delivery but had problems with information I have just received and just found some information on but not a lot on this version also having difficulty in finding the software to update to the latest version as I had same problem as you did when you started to use. The jk bms web site doesn’t have anything re software updates on have tried doing online search for this update not a thing. I have email via my phone ad ther website won’t send emails at this moment have reconnected the seller but I think it’s an agent. Dot know if you can help with a version of This software as I can’t get anything to work at the moment. Lol. I wanted 4 weeks for the 2 to arrive it did exactly on the day that they started but can’t build my two 8s 3.2v 304ah units until I can get this software. I was interested to see if others had same issues What I can see is a good build. But at this moment in time had to stop the build so frustrating. Lol Anyway Andy keep up the good work on your project. I watch your videos In batches. Usually when I can’t do anything Ch. from Kev in the uk
Hello. A link to the application you're using? Thanks
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!
hello thnks for your vid ! do you think it will need an active balancer to work with ?
No, the JK has already a built-in active balancer. Works a treat!
@@OffGridGarageAustralia for charge and discharge ?
@@bonnetalexandre2085 Yes, works fine without an additional external balancer. Try it first and if you cells are really that bad and won't balance, you can always add one later on.
Hi Andy, although this video is already 2 years old still very valuable. I'm currently setting up 2 48V batteries with these JK BMS's and found this video very helpfull. Thank you very much for this. But despite this I still have question left and that is regarding the size of endlug you mounted onto the black and blue cables. When I look at the diameter over the strings (5mm) the diameter of the lug should be more than 5mm. I would say 5.5mm which belongs to the size 16mm2 lugs. Do you agree on this? I would love to get your answer. Thank you for all the great work you are doing I learn a lot from your videos. Kind regards, René
With the latest issues/resolutions of the JK BMS firmware, would you still recommend this unit?
Can you help? I have a jk bms 150 amp. 2 amp, I have 16 batteries of 280 ah, how do I set all the settings correctly
Have a look on my website for the settings. There is also a video on how to set it up: off-grid-garage.com/my-settings/
Is it possible to read the BMS (with gps) from other locations..?
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.
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.
Yup, im running into that issue consistently :( today, i just cant get either bms to turn on at all
@@OffGridGarageAustralia Was this topic followed up here! Or are there updates on the part of JK that enable switching on through another function?
@@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: ruclips.net/video/LDalnC01MZE/видео.html
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?
What's the "standby current" of the JK BMS?
Good question, it does not say in the specs. I would imaging not more than 5mA.
@@OffGridGarageAustralia Thanks. Would be interesting, and should be fairly easy to check :)
I think it goes into some kind of deep sleep mode when there's no communication as well.
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
I contact JK about a bms and the told me a 500a bms was $180 but $140 shipping and a $30 wire fee. Do you buy from them directly and get this treatment?
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
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.
Hi Andy! Greetings from Germany! Can you tell me what USB interface you are using to connect the BMS to the Raspberry Pi?
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
@@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.
Hey Andy, is it safe to start the BMS with the multimeter on continuity or the on the diode setting?
What are you trying to do with a multimeter?
The new JK-BMS have a start button now so don't need the start up procedure any more.
Great video. I ordered one from your link. Where can I download the app for Android phone?
Thank you!
There is a link on my website to download the app for Android and iOS as well:
off-grid-garage.com/battery-management-systems-bms/
you just scan the QR-Code printet on the BMS........
Happy Easter from Canada Andy. With the Easter theme do you worry you will have all your eggs in one basket with the huge BMS. Could you not have two half banks with a switch to transfer either one in the case of a problem with the other.
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
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.
@@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 😀
Any thoughts on the above Andy?
@@GavinWallace18 I don't think it will display any SOC or battery state without a Victron battery monitor or shunt.
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
Thank you man , i wonder if it provides historical consumption data ?!
They do have an 8S now
I think you can make them work with even a 4s with a small buck converter. I'll show this in a video soon.
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?
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/
I am looking at the aliexpress link you provided. In the title of the product it says 36V 48V 60V. But looking at the table data listing I can't find anything about the voltage. I want to build a 12volt 840ah battery with 12 280ah eve cells. I tried to send a message to the seller, but just got the same data that is all ready on the aliexpress site. Will this support this?
How is this bms and battery working now
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 ?
Where it said maximum charge current 25 amps did u change that Andy to a higher charging current certainly ur charging with only 25 amps right I'm I missing something here ?