JK-BMS: all settings and menus explained. How to program and set parameters.
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- Опубликовано: 21 авг 2024
- In this very detailed video, I explain all the settings and menu options of the JK-BMS. If you're new to the JK-BMS or just want to understand BMS settings in general, this is the video for you. I also give a lot of context and explanations about why I have chosen these settings and why they make sense.
If I forget anything or you want to add some more information, please leave your comments down below. Thank you.
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![JK BMS B2A8S20P Detailed Settings [UPDATED]](http://i.ytimg.com/vi/pTveDIsosjQ/mqdefault.jpg)
I tend to catch up on your video's at night. My wife says your voice is very soothing, and she drifts off to sleep. She has no knowledge of anything battery related (not has learnt anything since hearing you) but is sleeping very well 😅
An example of how good this BMS really is. I installed 32 EVE 280 cells with no top balancing, hoping the JK BMS with active balancing would do it. The cells varied from 3.1 to 3.4 VDC. Three days later, the difference is 7 MV. Great product Andy, thanks for the recommendation.
Thanks for sharing. That's what I do as well, I don't bother putting all batteries in parallel any more, I just let the BMS handle it.
@@OffGridGarageAustralia true true I got my batteries around 10pm I just parreled it till 10 am and connected it to the BMS and a day later it's in balance with .2mv diff
I made the same experience.
I'm trying to find for 32 cells and I can't find it, please a link where you bought it I will be grateful thank you.
@@christosxenopanagos2737Most likly 16s 2p configuration
Thanks Andy.
I really appreciate all the time you put in making these videos. I learned allot from your videos so far.
I want to echo what someone here said, "As always, you are meticulous and thorough with everything you produce in you videos."
Thanks a lot, Philip. I appreciate your kind words and support. Thank you!
I switched to the jk bms from the daly, best decision ever.
It's the product a lot of us waited for: BMS, active balancer and a heating pad control in just 1 product.
I have the same product (with heating pad control) coming in the mail. Do you have any heating pad/element recommendations?
I think it's the best integrated BMS on the market. The easy setup and active balancer makes it outstanding.
My 4s-8s BMS has the heating option too but I don't have the connector to test it out. It's only 3A, I believe...
The video is pretty long but is very informative so was worth watching every minute of it. Thank you!
Another S.P.A.T from me to Andy. If you have used this good man’s content and haven’t gone to his web site and bought him a beer, you should do so ASAP. I used his recommended suppliers for 32 EVE 280 cells and a couple of these awesome BMS units. This video was “icing on the cake”
Thanks again Andy.
Great advertising, thanks for the S.P.A.T. 🍺
Thanks Andy, awesome stuff.
It’s always a good day when there’s another video from OGG!
The way I took it on the Vendor ID Name is. JK is the name of the company. The B2A stand for balance at 2 amps. 24S Stands for 24 in series. And the 20P stands for 20 in parallel that's the way I always took their ID name as. Thank you love your work on RUclips. I AM A BIG FAN!!!
15p is 150a, 20p is 200a. Not sure what the P is for.
Thanks, man. 20P for parallel... you can have as many in parallel as you want, I guess. One does not interfere with the other BMS's, does not know how many are in parallel.
My guess is the ‘P’ is for Parallel and they are using 10ah cells as a reference point, just guessing.
@@krg038 POWER maybe .. those chinese developers are unpredictable
Not parallel guys. It is from amps. 20P means 200Amp
Great walk-through of the JK BMS. Once again, you have done what nobody else has.
Thank you. I will continue this series with all the other equipment I have.
As most people have already said I thank you greatly for all the time and energy you've devoted to these video's. I just picked up the jkbms to replace two daly's that I've started to run into balancing issues with. These video's saved me so much time determining which bms to use as a replacement and with installation/setup. I truly wish I could afford to send you a super thanks at this time but some day when I can spare a few bucks I'll send them over for you to buy another cold one!!!
I used JK-bms for my e-bike battery build after watching this video. thank you . great job
Thank you for all the details explained. I am planning set my own DIY lifepo4 battery pack and was looking for a BMS brand that can trust. JK is a reputed brand in Sri Lanka as well. And you explaining all the features one by one was amazingly helpful.
It might take few months for the batteries to ship but now I know where to start. As I read in comments Top balancing is no longer an essential task as the BMS does take care of it.
So thanks for the great information. Take Care ❤
Thanks Andy. I bought the JK BMS after watching your videos, actually. 😅.
Thank you. As an inexperienced user, I could not immediately figure out all the parameters. Now everything is clear. However, I had to learn English for this.
Hey Andy! Ich wollte nochmal DANKE für deinen Rat sagen. Mein System läuft jetzt seit knapp einem Monat und es schaut alles super aus. Viele Grüße aus dem Sauerland!
Danke Dir! Sorry, konnte nicht mehr per email antworten, es sind einfach zu viele.
Installed mine today with a Victron mppt 75/15, 100ah lifepo4 and a 100w solar panel for camping. Perfect and thanks for the detailed reviews and setup guide.
Thank you Andy. I’ve successfully fitted a 4-8s JK BMS following the video that ended in magic smoke, I had to check ahead so I knew it wasn’t a fitting instruction issue 😂. Now I’m getting the settings tuned 👍
Hi Andy,
in my opinion the Con.Wire Res. ist the resistance of your cell wiring. The BMS is able to calculate the "real" voltage of the battery because there is a voltage drop that becomes more important on higher currents e.g. 50A and higher. The voltage drop may be some mV but it is important, because the polarity will change while charging or discharging. so it must be added or subtracted from the cell voltage!
greetings from Germany!!
The cell wiring (bus bars) is in the order of 1 mOhm. It is probably even less than the internal resistance of the cell, which is around 0.25 mOhm. The Con Wire Res values on the screen look like around 150 mOhm, so they can't be the bus bars, they must be the balancing wires.
Thanks for this great explanation.
Just finished my ESS this evening.
Loved the video. As always, you are meticulous and thorough with everything you produce in your videos. I've been a long time fan and look forward to every video! Would love for you to someday install a Batrium BMS system on one of your batteries. Please consider this at some point in the future. Take care and hope that someday soon you have the sunny hot Australia back so you can charge charge charge! Take care my friend.
Thank you Andy for a great movie and another great lesson.
I just receive 2 JK BMS, yesterday.
There was a Power switch on this model, so I believe that the time where we had to jumpstart the BMS with a battery voltage.
Thanks for the video, now I don't have to use a lot of time to examine all the settings 👍
Mine had a switch power button too. Good idea.
Yes, all new JKs are having a display with power button.
Honestly I have jump started mine exactly once since I installed in the battery shelf. It will never disconnect unless I take the battery apart.
Oh I jumped straight into tech head and neglected to say...thanks Andy for your excellent work... Cheers 🍻
Thank you!
Hi, for me as a German your English is very clear and good to understand! Thanks for all your testing, it helps me very good to understand the Technics overall. Now I will look your Victron Smart Shunt Video ;-)
Thanks, Uwe.
Thanks for this video. I couldve guessed the functions of 80% of these parameters, but it's very valuable to know exactly what I have control over, as well as within what range they should be set to. I find it very interesting that the balance trigger voltage on mine was set to 3.0V by default. That's 10%!
Great video Andy, I have been waiting for it from long time. In just a month (August) finally I will install the first 304Ah batteries and JK, so I will copy your settings in mine. Thank you !
Thanks! It was very useful. Constructing a power bank to survive next winter with the powersupply for several hours a day here in Ukraine.
Another great video. Completed my battery about 6 months ago and wanted a JK BMS but at that time they didn't have one for 4s. I went with the Overkill (JBD) and so far it is working well and the cells are staying well balanced so far.
Someday I might need that increased balance amperage but, fortunately, right now everything is running smoothly.
I am going to try the JK BMS on my next battery.
Thanks for what you do.
Thanks John, the JBD is certainly a good BMS and I would use them as well. The Overkill I have (rebranded JBD) works well without problems.
@@OffGridGarageAustralia Hi Andy! Which one do you prefer for a 4S battery pack, the JBD or the JK BMS??
Congrats for all your videos and your channel. Amanzing work!
THANK YOU! Just what I needed. A detailed, methodical, non-rushed explanation of the settings. Legend. 👍
Thanks a lot, hence a 40min video. It takes that time 😁
Your channel is a treasure. Can't stop watching the videos. I am not sure if it is the deep knowledge you provide, your accent or your moustache.
Are you planning to do any video about JK setup for parallel cells? For instance 16 cells setup as 8 pairs in series for 24V battery bank? Will this setup work? Wonder of your expert opinion and test of course. Thanks.
vielen Dank für die Videos, die für den deutschsprachigen Bürger sehr gut verständlich sind!
Thanks Andy! My JK BMS 4S arrived a few days ago. I was wondering how to program all the settings. This video was super helpful! Have a S.P.A.T. on me.
Thanks a lot Joe, much appreciated! Enjoy the JK.
Hi Andy, Thanks for your very informative videos and reviews. I did a conversion from lead acid to 16 x EVE 304Ah cells in my G-Wiz EV using the JKBMS 20S - I did this about a year ago, and watched your videos to help me decide which kit to buy. Since winter time, I'm having issues with some of my cells, probably due to stress and low temperatures affecting performance. The "SOC" on the display is basically correct, but on my vehicle when I go below 40% soc, one of the cells starts to underperform, usually when the heater is on, I'm accellerating hard and going uphill... momentarily dropping below the cut-off voltage of 2.45 and the cut-off engages, stopping the car, a few seconds later, the voltage increases and it works again, I obviously turn off the heating and acellerate more gently. The other cells are obviously all ok, being over 3v. I was wondering if its possible to change the "SOC" so 0% is at the real level of 40% where my cell starts to play up. How could I do this? perhaps change the cell capacity value lower? I've ordered a replacement cell ... but I'm also mulling over adding another cell so its 17 in series to help.
Andy, congratulations on exceeding 34,000 subs! I think word is getting out about your channel. Good news travels fast! All the best!
Oh, yes, damn, I missed this again. Thanks a a lot!
Thanks Andy I’m still catching up on all the videos. I think the German accent added with Aussie slang is great. Actually laughed out loud this morning from another video when you said “it sh1t itself”. Keep up the great work.
Helpful and thorough information, as always. Thanks Andy!
My pleasure!
Thank you for this and also the video about the charge controller settings!
It would be really really interesting with a video about the settings for the Victron shunt as well.
That’s so true. I like the accent and the rumble off “fully discharged and fully charged, really good results and…hmm the “further to due”!. Makes me wake up in the morning and gets me sleeping at night. But I will say that for me personally the most important aspect is Andy’s educational performance. :)
Thanks a lot, appreciate your feedback and kind words!
Thanks for your vids, I've ordered new JK BMS 300A from ali express for 80 pounds. I'll use it with my 620AH 12v bank I am going to build for my camper.
Thanks Andy! And perhaps it's not just the accent, but more the movie set.
Thanks Jack. I try to mix things up a bit. As you can tell, I'm not a tripod fan 😂
@@OffGridGarageAustralia And all for the better...
what a beautiful garage, sir. it's literally a dream of every decent man. 👍
Excellent. Thank you. Saves me a lot of time reviewing data sheets. Greetings from Gemany.
Thanks, Bernhard.
I am been very much blessed and educated by your videos. Thanks a lot for your wonderfull work. Receive our warm gratitude. Russell from Rio de Janeiro Brazil
Thanks for the lesson Andy, will help when my JK arrives. Cheers
Thank you for the great explanation . Your videos helped me a lot to setup my own off-grid system !!
Thanks for your feedback!
I cut the sense wires to different lengths, to neaten up the mess on top of my battery and of course it does show differentiated resistance values on the status tab. There was a bit of a debate on the forum regarding the wisdom of cutting the sense wires of BMS's, however it seems to be functioning perfectly. (WHEW! this first time builder thought id made a mistake...) However, the question of the settable resistance values on the settings tab is one i'd sure like to have answered... thanks Andy!
Thanks Kelly, perfectly fine to shorten or extend the balance cables. There is no downside to that. The BMS is either measuring cell voltage or balancing but never at the same time, so cable length is not an issue.
@@OffGridGarageAustralia So, just to be clear, i cut the sense cables to various lengths. Individual wires are NOT equal lengths. Conversation on the forum regarding the wisdom of doing that revolved around other brand BMS's and group thought it a no no... Andy, your work has helped me tremendously and i thank you.
Nice and informative video. Thank you very much.
Connection wire resistance may be important when the balance happens. Balance current goes through those small wires and there will be a voltage drop when ~2 amps goes through them. And if we set up a correct resistance of them, then BMS can calulate the individual battery voltage by adding them to the messuring voltage of a cell.
Brilliant video, could not find a manual and you explained everything
Can confirm. I probably would not watch this content if someone else hosted this video
Hi Andi,
i think SHORT Circuit is at 350 A (max Amps the BMS can handle)
..in the datasheet is written 200A Continuouse and 350A max
Yes, it is
Would make sense. Thanks. I shall try, ey? 😁
@@OffGridGarageAustralia yes. Please.... Maybe not... 😁👍
That would make sense.
Go enjoy that beer Mr.Andy thank you for this tutorial.
Thanks, will do!
As always great content. I only run a 4s 280ah setup using Daly( for a higher amp draw,as there is nothing much else out there) but I find your videos very interesting and informative. Would love my own off grid setup but I rent and can't justify building something portable.
Keep the content coming.
Absolutely nothing wrong with daly. Good at what they do. Csnt fault mine after a year.
@@LambySRI If you look around you will find a few complaints . ruclips.net/video/JbnFyU79Nf0/видео.html
What's the max amp draw on that? I have a 4s JBD that is rated 200A with 0.5A balance, haven't tested it extensively yet but seems good so far.
The Daly's are good for this exact purpose and can handle up to 500A continuously. As you said, nothing else out there (unless you go QUCC with a relay function). The balancing totally sucks though so an active balancer may be needed.
There is a 500A jkbms but it needs external relays. JK-B2A25S60P
I was surprised to see, that my Manuf. Date showed 2022-07-08. It looks like the BMS saves the date of first operation! ;)
Thanks Andy, this is very informational. Good stuff.
Forgot what I was gonna ask! Thumbs up and still subscribed!
Ah, great thanks a million times 😆
Well described Andy, I always found these batteries daunting but you have described this to a tee👌
You are TOP GUN BMS teacher for DUMMIES...me😅 can't thank you enough!!!
Thanks for your feedback!
Can confirm the short circuit protection works well in the jk bms, my inverter blew a mosfet while i was at work thankfully the bms was there to disconnect.
The only thing that makes sense with the connector resistance-table is to compensate the voltage-drop caused by the resistance of the power-connectors between the battery-cells/blocks. In my job i am specialist for UPS and have to take care of about 3000 battery-buffered systems in a big chemical factory. We do a lot of capacity probes with single block measurements and to evaluate the results it is nescessary to know which batteries are connected with longer connectors than others (e.g. to pass over to another level in the battery-rack). For there is only one sense-wire for measuring the plus-pole of one and minus-pole of the next battery, you always measure the voltage of one block/cell plus the voltage-drop of one power-connector.
And this voltage-drop is not negligible... e.g. one connector only 40cm longer than the others in a system with 70mm² connectors will already cause about 5mV higher voltage drop at 50A resulting in 5mV less cell-voltage measured and - if not compensated - falsifies the state of health-judgement.
I figured out what the cell wire resistance is. It's the resistance placed on the wires so the bms can remember the cells out of balance difference. When you have cells of un equal WH duringg initial top balance those values get tuned so next time you charge up you don't get cell run away..
Brilliant walkthrough settings! Thank you Andy!
Great video, it helps me a lot to tune my JK BMS
Great it helps. Thanks.
Thanks Andy, great video. JK BMS coming in the mail in a month or two.
Hi Andy,
many many thanks for the really detailed info about these settings.!
will use them when setting up my JK 16S System roughly the next month.
Best Regards, Jörg from nearby cologne, Germany
Hi Andy. I've been watching your videos. Lots of info and learned how to assemble my own 280ah 16s lifepo4 battery. I'm having some issues with my JK smart bms. I bought an inexpensive dc charger from Amazon, but I didn't have much luck. So I assembled the battery and wired in the bms. I attached my Lithium battery charger to get a top balance. It won't charge past 3.34v/cell the AH rating sits at 198ah. The voltage is 53.56, which is 97% charged.
I know this is my future BMS purchase all in one , currently using JK ACTIVE balancer and XiaoxiangBMS ✌️
How is this JK Balancer? They are not cheap either, right?
First of all, your videos are amazing Andy! SO SO helpful that you test all these BMS's so we don't have to! And you explain so much. So many of the tricks and traps around battery charging and balancing. Great stuff, thank you!
I'm getting confused though. You have a video demonstrating how active balancing can actually unbalance your cells because it is always on. Then we have the JBD Muller Edition BMS which turns off its active balancer when it's not needed, supplanting the JK BMS at the top of the BMS pile. Problem solved. Now I see this video for the JK BMS settings, which let you set the balance start voltage to 3.45v.... why is the turn off feature on the Muller BMS any different from this ability on the JK?
Does this mean the main difference between the muller BMS and this one is just the maximum discharge current (250 vs 200(ish)) and the active balancing current (5A vs 2A)?? Many thanks from the UK!
I am French and I think you have an accent too. But strangely an accent that makes English easier to understand for me. All people speaking English should speak with this accent lol.
Hahaha, great. Merci beaucoup!
who else is here for the content and bonus accent?
Andy, you are a hoot. 🤣
I appreciate the info that you provide. Thanks.
Amazing video Andy, finally I have got my battery ready to calibrate the BMS, all due to your instructions. I got a JK BMS for 24v which was the only one at the time, I did want 12v, but I have used the buck converter to get the 24v. Did the 7v short trick (thank you) to get it started. Using the software on my iPhone on the status screen, I can only see half the screen, the other half disappears under the settings screen, might be due to the version of iPhone. The only other thing is that it will not let me change the Charge UTP setting and it defaults to -20 degrees! It will never get that cold here in WA but it does get down to freezing especially outside and early morning. I can change most settings which I did not think I would be able to on the iPhone, I thought I had to pay for that. Oh well am now a little bit further down the road on the journey. Thanks so much for all your nerdyness😎
Thanks a lot for your kind comment and words, Jackie. That is great to read and I'm always pleased if I can inspire people following their own projects.
Version 4.7.4 is the newest one I believe. Not sure why it does not let you change that parameter. Do you get frost in winter near the battery, is this really a concern?
@@OffGridGarageAustralia I have now obtained a disused Samsung phone and this is what I will be using as I get the full page of info and can see all the parameters when scrolling. I downloaded the latest version V4.8.2 - woopee it now changes the UTP, we are in the hills outside of Perth and it is always 1 deg cooler up here...lol - probably do get the odd frost, YES you do inspire me, I am a bit of a chronic DIYer but it is great to be able to collaborate with other likeminded people. There is always stuff to learn and it is what makes the world go around! All I need now is to be able to see what my battery is doing over the internet, when I am away. But I do not have any Victron stuff, my battery is basically providing off grid power to my aquaponic setup, idea being power outages will not kill my fish! Thanks Andy.
@@jackiedines5229 thanks a lot for the update. Great to hear it's now all working.
37:57 "User Private Data"
This is a ONE-TIME user changeable data. You can enter a string and it will be made PERMANENT!
What use for? Use as a signature like "Andy's JK BMS" such that if stolen you know it is yours.
Or Battery name like "JK BMS Bank #1". So when you have multiple JK BMSs around and you want to know which JK you are viewing, just go over here.
I repeat, this can only be changed ONCE.
in app version 4.9.3 it can be changed over and over
@@ajnsan NICE INFO! Thanks!
@@ajnsan I tried it today: version 4.9.3 and all the other higher versions, no dice.
"User Private Data" is field that can be set in the JKBMS App to identify the BMS in a multi battery environment.
Vieles war mir klar aber alles wusste ich auch nicht. Danke für deine Erklärungen !
Thanks for reminding us changing BMS password!
Besser kann man es nicht erklären! Vielen Dank!!
Beste Grüße aus good old Germany. :-)
This is an amazing video, thank you!
Excellent guide, thanx Andy 👍
Thank you.
Good job. A hug from Brazil 🇧🇷
Hey Andy,
I think the wire resistance is not the sense wires as this makes really no sense.
I am very sure that the BMS is sensing the resistance of the the bridge wires between the cells !
This would also make sense to have the limits for that in the settings.
Also, the measured values seems to fit into the expectation.
This is also a security feature to find loose or faulty battery bar connectors. Loose battery terminal can lead to burning.
Update:
No, it is really the line resistance of the balance leads.
They use it to detect false connections
Thanks Christian. I have to try and take one balance cable off the battery or add a resistor to se what the BMS does when it detects a higher resistance.
@@OffGridGarageAustralia yes Andy, YES, test it 🤓
I like your accent. Damn, it's soothing.
Watch all the videos again, there is more accent in every of them😂
A big reason for the for the cell wire resistance is due to the high balance current. I have mine set to balance to within 0.008 volts (8 millivolts). When it detects a high cell more than 0.008 above, it will start pulling 2 amps from that cell. With a wire resistance of 0.147 ohms, 2 amps of current draw will cause the reading to drop 0.294 volts. 294 / 8 = 36.75 That is an induced measurement error of 36 times as much as the voltage difference we are trying to measure. And the revers happens on the low cell. When it tries to push 2 amps, the voltage will jump up that 0.294 volts. That is not the real cell voltage, it is only voltage drop through the balancer wires. When you first power up the balancer, it cycles balance current in and out of each cell to measure those values. It then calculates a correction factor when it is pulling or pushing balance current. It is actually a very smart way of being able to monitor the cells while balancing.
Thanks Luke. But the BMS will only ever measure the voltage of a single cell OR balance this cell but never does both at the same time. It may show the cell voltage during balancing but I doubt it takes this into account as a real measurement as this would make no sense.
seguito video passo passo mi hai convinto, ora acquisto jk bms😁 grazie
Exactly, we just come here because we want to see and here you! Battery learning is just a plausible excuse...
Like always! Great video! Thank you for that!
A remark to the calibration of the current value. In the beginning I had the same issue. But the reason for that was the load I used... An inverter... And this pulls not a constant current from the battery. The current has high high ripple with twice the grid frequency. At the end I used a large pure DC load with high current and repeat the calibration. Than it works perfectly and I get a good accuracy for the current measurement.
Another point I did not understand is the over current protection of the BMS: I can understand that if I draw only a little bit over the defined limit the time until the BMS switches of takes for example 30s (when set to this value). But what happens if I draw for example twice the defined over current limit? Takes it the same time for switching off? This could be dangerous. What is needed here is a fuse characteristic: The higher the over current is the shorter the switch off time should be. Maybe anybody knows something about this? Or this would be an interesting test for Andy 😉?
But again, thanks for your interesting videos!
Thanks Andi, that is absolutely correct and the ripple effect can be the cause for the calibration issue of the JK-BMS. Usually you just don't have any other loads you could connect to a 48V battery.
The second point of your question is what I was asking for in my video as well. In case of a short for example, how does the JK determine that? In other BMS's (the QUCC or JBD), I can define a current threshold for a 'short' and a reaction time for the BMS to shut off.
Totally agree with you here, that is a very missing setting in the BMS. I'll take this back to Hankzor and see what they say...
Good points Andi, and Andy did refer to this “What is a short circuit current” issue with the JK, it needs to be addressed.
Formidable vidéo explicative ! merci ANDY pour cette experience de configuration du JK-BMS.👍
Ask and receive! Thank you for this video! 👍
Rule #1: Always listen to your audience! 😉
Awesome conclusion of the jk hmso settings! Sadly I'm still missing the heating function part... Looking forward to getting any further information on that, since I'm building my battery within the next few weeks. Greetings!
The 4s one I had in my hand has the heater function but I don't have the cable for it to connect anything. I will have a look in the BMS settings to spot the difference.
@@OffGridGarageAustralia Anything new here? i will start building in the next weeks and want to add the heating function from the beginning - i have no clue how to use it or which pin is what. any idea where to get the correct cable?
cheers from sunny hot germany :-)
Oh juhu 42 min!
Du solltest öfters lange Videos machen! :)
Schöne Grüße aus dem regnerischen NRW wir haben 0 Amps outside :P
Aber wenn wir die Blitze Einfangen könnten..... Hmmm...
Ich habs schon gekuerzt. es war ueber 50min lang... 😂
I’ve got to banks at 24 volts, 560 amp hours per bank. Two 280 cells parallel 8 cells in cerise. I have a jk bms on each bank. I’ve been running them now for over two months with no problems at all. If you have settings right then you should have no problems.
Thanks Alan. Does the balancing still work ok with two 280Ah cells in parallel?
@@OffGridGarageAustralia they stay within.03 milamps when close to the top. Can’t tell as they go down because they all stay about the same in the flat. But yes, very close.
@@OffGridGarageAustralia Using your method of balancing by starting at 3.45 seams to work well. They seem to drift a bit when lower, like 3.3 and it’s mostly under load then, but when they hit that 3.45 mark, they are really close together
"I don't know. What accent?" I had to stop and LOL there.
What? Why? 🤷♂️😊
One thing I miss on this BMS is a relay output you could program yourself .. for example let the BMS tell the charger that the cell voltage or charging current became too high, so the charger can act rather than the BMS.
Let the BMS tel the charger to stop charger on 3,6v and BMS cuts the charg on 3,65v...
Well, you could attach an Arduino at the RS485 port and you are almost done :-)
@@Poebbelmann Especially since it's actually a TTL port (with Rx/Tx lines) which you could directly connect to a UART on the Arduino, or use a USB converter to connect to a Pi. I use this to graph the data in Grafana, but also to make decisions on when to turn on the water heater, etc.
Seplos will talk to many different inverters, or you can do your own thing with mqtt etc
@@edc1569 Spelos?
Hi Andy, maybe this is not new for you, but while I was following this video to learn a bit more about the JK-BMS settings, I found that my version has a new setting called "Device ID", what can be very usefull if like me you are using the modbus driver for Venus OS.
Andy, WOW! What an incredible resource your videos are!! My clarity on LFP has been vastly improved because of your work here. I'm just now beginning to build a 16-cell 12-volt pack for our live-aboard sailboat. The JK BMS looks to be an incredible value. I wonder? I see it does 16 (to 24) cells, but my config is 4s3P of 160Ah batteries for a total of 13.80V @ 480Ah. (I have another 4 cells but that's stupid overkill for our needs on the boat. The extra four cells will get mounted in the battery box anyway at a storage 3.2V for redundancy (gotta store 'em somewhere, right? So I can keep an eye on them right there too). Can I use one JK BMS for all three of the 4S cells and put the -B -P of the BMS in the Negative side of the combined pack for a complete cutoff of the entire pack? Or...better; should I get 3 JK BMS only connecting each 4s group to a separate JK BMS? Although expensive I like the latter idea if one 12V battery cuts out there are still two in parallel supplying power. Your thoughts on this will be enormously appreciated! Cheers from the sv/Lucky Spin, Ventura Harbor, CA USA
Hello, sorry, just read your question here and nobody had replied so far...
Firstly, thank you for your kind words, great to hear you have followed along and learned a bit here and there...
Yes, you can use one BMS for your 4s3p setup. All cells in parallel will act as one cell for the BMS.
You've got the point, if you buy two more BMS you can have three individual batteries in parallel which gives you far better control over individual cells and also redundancy. That's probably what you want on a boat.
I also sail and RV. If you plan to stay at 12V, I recommend building 3-4, 4s batteries, each with its own 160 or 200 amp (adjusted to your actual capacity) BMS. This will allow the BMS's to monitor and control each individual cell, which is best for performance, balancing, longevity, and safety. I have a 12v 3000watt inverter on board which needs a bare minimum of 3 parallel 12V 100Ahr batteries to operate effectively. This means that a single 200A BMS alone cannot supply enough power to handle the full load and will disconnect. With 3 batteries/BMS's, each will supply 1/3 the total load. Estimating your continuous and peek loads is required in order to design and fit the best battery configuration for your boat.
The configurable sense wire resistance settings may be for mobile applications (boats, RVs etc) where some batteries are in one location and others are much further away in another. This gives different resistance and voltage drops for the packs' sense wires
Cable length will not make a difference when measuring voltages.
Hi Andy, love your videos !
On the subject of voltage drops and cable restistance, TEST IT 🤓
@@OffGridGarageAustralia sense cable wire resistances will make a difference while they carry a balance current. If the BMS unknowingly copes with high wire resistances while balancing, it will affect balancing performance (balance current will add negative tolerance to the cell which is being discharged, and positive tolerance to the measured cell voltage of the cell which is being charged, resulting in an earlier than necessary completion of the current balancing step. As soon as the balancing stops and the measured cell voltages represent the real cell voltages again, it will continue balancing the same two cells)
I'm still testing, this value is to calibrate the voltage on load. If you stop charging or discharging and you measure a cell the BMS give you the correct voltage but on charge it will give a different voltage since there is a potential differential, if we don't calibrate we will have some cells starting to run away. I had one cell that had 0,1 overvoltage on top charge, this lower the capacity in 9Ah in 3 months, after changing cell position on the battery I notice that the voltage of that cell was normal. I had the same problem in another battery and changed the value to 1 milli ohm and it lower the voltage and it stop being the one with highest voltage. Test your cells independently and record the values, if BMS give a different one adjust this value, this is only for balance but since the worst cell will have the highest voltage on charge it will stop charging when reach balance voltage and start discharge to equalize the voltage, so balance will discharge the weakest cell. Using Andy 3.45V will reduce the problem but won prevent this.
@@OffGridGarageAustralia
What about cable length when you’re balancing? Then you are drawing or pulling current from the individual cells … relative small amps… I know
And what if sensor cables are not of equal lengths due to setup of the battery bank ?
Thx
Since your are du hyped about these BMS I ordered a second one. A 2A24S15P (2A balancer current, 150A). This is also printed on the casing and reported in the firmware. However, when I opened it the PCB had a label 1A24S15P, indicating only 1A balancing current.
Seems I paid 20€ more just for a different firmware. I hope the hardware is really capable of 2A balancing current...
Oh, so what now? Did you get a discount or are they sending a new BMS with the right specs and you can keep this one?
Well explained Andy, Thanks Andy
Thanks Ross!
My eve280s come today. Plan to set them up just like yours. Had no idea what to set the inverter (Sol-Ark 8K) to before watching your video. I have a 14s100p 18650s battery and currently run them 54 volts and 45amp limit (very conservative settings). Plan to replace them with the lifeP04s, but since the voltage is nearly identical, might try parallel at some point.
We just love you!
Love you all too! ❤
Thanks Andy. As you know I have 4 batteries going on my 5th. All jkbms. I had a bad cell and the jkbms shut off the pack so further damage was prevented. The settings are personal so I like 80/20% balance 3.3, ovp 3.4v, uvp 3.1v. The ocp to 10s saved my battery pack when there was a problem. My discharge current is .5C of my AH.
I have successfully operated the bms at 46C. Great video. You have an accent? I'm always looking at the beer foam in your mustache.
Uh, oh, very conservative settings for your battery. OVP at 3.4V? Does that work at all or does the BMS shut off all the time. I think that's a bit low?
@@OffGridGarageAustralia never shuts off. 3.39 ovpr shuts off charging. It's a tight balance that I used my coulomb counter to obtain. In a year I will remove some cells for capacity testing.
@@OffGridGarageAustralia never shuts off. 3.39 ovpr shuts off charging. It's a tight balance that I used my coulomb counter to obtain. In a year I will remove some cells for capacity testing.
@@krg038 on, yeah it does not shut off, just charging... True.
I found charging to 3.4V only is very inconsistent though and could be anything from 70-90%.
What do you SCC do when you turn off charging on the BMS?
@@OffGridGarageAustraliamy scc doesn't ever reach 700000 coulombs for my bms or 240ah battery (230ah rated). Basically the bms doesn't ever get to shut off charging. Its always discharging either to load or charging other batteries. Typically I run at about 65%. Im guessing the scc would fry with no battery (bms cutoff)