Reset the old JK-BMS to 100% SOC when fully charged with no OVP. Here is how.

[@olavolu]

Andy, your channel deserves millions of subscribers, you are fun, educational and very intelligent, congratulations.

[@OffGridGarageAustralia]

Thanks a lot for your kind words!

[@BradCagle]

Thanks Andy, and thanks to the commenter that found this trick. I've been trying to figure out how to get 100% SOC on one of my batteries with JK BMS :) Congrats on 80k!

[@OffGridGarageAustralia]

Thanks a lot!

[@krg038]

A great reminder. The reset was the trick a long time ago. I've used the coulomb meter and a volt meter for my batteries over 2 years now. I dont rely on the JK for much but to control shutoff OVP charging @3.5v for my 80/20%. Still 10 batteries all JK and not a single failed or degegraded cell (3 years). Good days in Australia. So. California has been very poor for sun. Unusual weather. Keep up the great work.

[@OffGridGarageAustralia]

Thank you. Interesting you are doing this 20-80% thingy. Is this with LFP cells as well or Li-ion?

[@krg038]

@@OffGridGarageAustralia LFP. It makes little difference to run them further up or down but in the 80/20. I take full advantage of 90% capacity. Hopefully also extending battery life. As you may recall I do the nerdy thing and routinely take a battery offline and capacity test some cells. My spread sheet shows no degregation (might be a bit early in the cell life.) I have enough batteries/solar to run my So California house for several days off grid on rainy weeks (I am grid-tie). My system cabinet is temperature controlled as needed. Assembling it over time was minimal cost and all diy(learning as you did.) All the batteries balance each other. I do monitor the JK's for a cell that may be the one that is always balancing since many of the cells are possibly not new (early purchase scams)

[@rhp20001]

Uncle Andy, you're marvelous. We've learnt a lot from your videos and enjoyed the every bit of knowledge and humor in it. Thought to write this comment at this wonderful milestone of your journey. With much Love from Sri Lanka.

[@OffGridGarageAustralia]

Thank you so much, my friend from Sri Lanka!

[@noxikid]

As other comment states, beware change batery Ah resets cycle count, which will be very sad for somebody. You should be able do do that without changing this parameter and it's olny one time reset, it will drift away over time. Congrats on 80k Andy and thanks for everything you doing for us!

[@OffGridGarageAustralia]

How do I do that without changing this parameter. Not sure what you mean...

[@baygon12]

After many unsuccessful attempts, I had got used to no longer taking into account the SOC indication on my BMS! I use a sheet of paper with the Volts/SOC correspondence. As soon as the sun appears again, I'll follow your advice and come back here to leave a comment. Anyway, thanks for your videos and bravo for the 80k+.

[@OffGridGarageAustralia]

A piece of paper........😯

[@lukas181118]

I must have the ,,good one ,, here . Not the same version but. , I’ve got 2 jk-B2A8S20P and when you set certain voltage on 100% soc it works like champ. Soon will be 100k Andy ! Keep it going .🎉

[@OffGridGarageAustralia]

Thank you. Yeah, you got a good one then...

[@obelix2xl]

Hallo Andy, ich bin total begeistert von alle den Informationen und hilfreichen Tipps. Danke, das ich so viel lernen durfte. Meine kleine PV-Anlage habe ich jetzt viel, viel besser im Griff und die Einstellungen deutlich verbessert. Liebe Grüße aus dem fernen Rheinland :)

[@OffGridGarageAustralia]

Thanks a lot and all the best!

[@OffGridGarageAustralia]

Thanks a lot and all the best!

[@cainweber1978]

Will Prowse, Roland W and now you. My DIY solar garage journey continues. I have 6kWh panels and 30kWh storage through Megarevo 6KL1. Thanks for sharing your knowledge and experience. Very fun videos that make complex ideas easy to understand.

[@OffGridGarageAustralia]

Thank you so much for your kind words. 6kWh for 30kWh... wow, that is a rather uncommon ratio.

[@cainweber1978]

@@OffGridGarageAustralia I decided on huge carry over factor as 1) uk has few sunshine days and 2) it serves a koi pond that draws 6kWh per day. The project will later incorporate a 16metre section of south facing roof to will become a 12kWh array.

[@keyem4504]

I remember well when you put up the 16k subscribers. Congratulations to that incredible growth.

[@OffGridGarageAustralia]

Thank you. Yeah, it's been a journey. UNBELIEVABLE!

[@pr5991]

Hi Andy, I have solis hybrid inverter, and I'm using it with 16 EVE 304 cells and a JK inverter BMS with an active balancer. I've been running this setup for the past five months. The JK BMS communicates the state of charge (SOC) to the inverter, but the SOC keeps drifting over time. Here's the issue: even when the BMS indicates a 100% SOC, the voltages drift slightly lower with each cycle. Over the weeks, the SOC gradually drifts, so while it shows 100%, each cell and the overall pack voltage are slightly lower than the previous cycle. If I adjust the battery capacity settings, the BMS resets to 70% SOC, and the inverter charges another 3 or 4 kWh. This SOC drift is frustrating because on cloudy days, my 16 kWh battery effectively only have 11 or 12 kWh capacity. The remaining 4 kWh stays uncharged because the BMS incorrectly reports 100% SOC to the inverter. To fully charge the battery, I have to keep changing the capacity settings in the BMS back and forth, where JK BMS readjust its SOC below 80% and doing so it also changes the cycles to Zero. Is there a way to use this inverter without CAN communication or by setting it as a generic battery? If anyone else has the same issue or knows a solution, please comment and suggest how to fix this problem. Thanks!

[@SkypowerwithKarl]

This trick has been working since last September on all of them, so I think it’s a permanent fix. Why hasn’t JK published this, I’ve got no clue. Congrats on the 80k!🎉

[@OffGridGarageAustralia]

Thanks for sharing, Karl. Good to know it works for a few months at least. Some are saying, it will drift over time, but I haven't seen it drifting. Still works for me after 8 weeks.

[@philippbeisteiner683]

Thanks for all the great videos.

[@OffGridGarageAustralia]

Thanks a lot Philipp!

[@jackoneil3933]

Congratulations Andy on the big 80!

[@OffGridGarageAustralia]

Thank you.

[@markmcm]

Congrats on 80k. ! Really enjoy the videos. Very helpful

[@OffGridGarageAustralia]

Thanks so much!

[@danielardelian2]

When OVP is set back to 3.65V, it looks like the 100%-reset is not based on voltage but on history of amps going into the battery. It doesn't really RESET to 100% at a defined voltage, but it gets to 100% by counting the Ah charged into the battery. This may be problematic because counting the Ah will drift over time due to measurement errors.

[@OffGridGarageAustralia]

Yes, I think that is true. It coulomb counts from there, hence we see the voltage over and under that previously used voltage.

[@FutureSystem738]

Fantastic Andy - really well done and well deserved! I’ll have to try that now! Cheers.

[@OffGridGarageAustralia]

Thank, Dave!

[@harrymuurling2742]

great solution, i did it already a few month ago, after this i only have to lower the capacity and put it again to the old data. My bms shows first 94 % and then goes to 100 %, it means my capacity actual is 94 %, correct andy ? And up to 1 million subscribers

[@OffGridGarageAustralia]

Never seen it jumping in my both JKs. It gradually goes up to 100% A million... pfff, don't have enough door space for that😄

[@artypete]

Actually had the opposite problem here - 99% SOC, but only about 50% in voltage, so wouldn't charge. This tip tricked it back into 50% SOC, so would then take a charge. Cheers Andy :)

[@garys-half-baked-offgrid-dream]

Congratulations Andy well done, your channel is an unstoppable force! Who was subscriber No1??? I was 1500 and some odd. It has been great watching you grow. I need a Peter board, my latest inverter won't talk to my Jks. (Umungst other issues lol) Luv ya Gaz

[@OffGridGarageAustralia]

Subcriber No1 was Luke, a friend for a long time. I told him about the channel before it went public so he subscribed! You have a lot of issues with your inverter. You have to slow down and make a drawing so we can help you.

[@garys-half-baked-offgrid-dream]

I have slowed it down, one thing at a time, I think I have 1 duff CT clamp on the grid feed and the firmware is a few versions old but I can't get it to connect to a divice, I have lost count of attempts. I have sent emais to LUX for tech support and next is some phone calls. I will do a clear drawing and put out an SOS. Cheers buddy.

[@gruetoo1]

Work's a treat..... hahah Your the Work's a treat. Grats on hitting 80k!!

[@OffGridGarageAustralia]

Yes! Thank you!

[@giuseppevillella9445]

Dai Andy sei quasi a 100.000 💯🌻🔋 tutto il tuo lavoro ed impegno lo meriti 👏🍀

[@OffGridGarageAustralia]

Whatever that means, thank you!

[@SoluSolaire]

Congrats on the 80K🎉

[@OffGridGarageAustralia]

Thank you.

[@EllisBergman]

Thanks Andy, very helpful, just set up my first jk BMS and home made battery pack. Its fitted to Reva Gwiz electric car 😂, so i fitted 16 304ah batteries with the B2A20S20P BMS, connected everything up, charged the pack to 100%, it read 100% but wasn't at the full voltage, 🤔 Tried the car, great, it showed between 100 and 200amp discharge most of the time but did have some high spikes at upto 400 amp😳 for a few seconds. Then the soc disappeared , 0, I turned everything off and on a few times but no effect, so I reset the BMS and it came back at 68%. Much lower than i would have expected. I have charged it up again and it says 100% but they are not at fill voltage, any advice 🤔 thanks 👍 Ellis Update, I just resent the 100 soc by changing the capacity of the batteries and they now say 73%🤔

[@OffGridGarageAustralia]

Thank you very much! Fully charge your battery and then fully discharge until the BMS turns off. The BMS will determine the actual capacity of your battery. 400A spikes are not good.

[@edwardvanhazendonk]

Great to see 80k spectators and nice people watching Andy's videos! Congratulations to all!

[@OffGridGarageAustralia]

Thanks Edward!

[@christiangroever4729]

80k..fully deserved! Great news on the 100% "reset", which probably is more a calibration to 100%, which will likely need to be redone if you "disturb" the batterie again, but as long as we don't do that😅..all good. I was also really p... about never getting the right "full" status, but this solves it..well done🤪

[@OffGridGarageAustralia]

Well, it seems to 'reset' the charge cycles once we hit OVP. Ohh, don't you love JK's software🤣

[@Juergen_Miessmer]

​​​​​@@OffGridGarageAustralia No, not by hitting OVP. It resets the charge cycle counter, if you change the capacity setting, as you did before. Look at your video between 9:00 and 9:14

[@pcipri76]

Hello. I am a great fan and admirer of you. Everything you do is super constructive and we thank you for sharing these things with us. I would like to ask you if you could post the Home Assistant dashboard (min 03:10) and possibly tell us how you entered the Multiplus and JK BMS data into the vrm platform (min 02:53)

[@KevIsOffGrid]

I balanced my pack with an active balancer earlier - first time in 5 years not using the passive 50ma balancer on a 12kwh battery. Was 140mv @3.575 avg - heltec 5A + 2 hours and its 10mv @ 3.61v average/cell I think over 5GW has passed in/out of the battery. Did you ever see my video comparing your worst day in winter with one of my best in summer?

[@OffGridGarageAustralia]

Great cells, you have. Need almost no maintenance... Never saw this video. I'll have a look!

[@saschahorstkotte3331]

Moin Andy, thanks for all this interesting stuff, but have you ever measure the real cell voltages? I´ve build 2 Seplos/Mason boxes with EVE 280k cells last year. After 6 months I made an interesting measurement. I use a constant 25A charge current and measure the mV between the aluminium busbars and the cell screws. Wow, up to 35mV difference. I clean the contacts again wirh the green side of a "Küchenschwamm" and Aceton and then all measurements decrease to less than 5mV. Interesting I find cause all BMS/Balancers measure the voltages at the busbars, in your Video with more than 50A current. Best regards from cloudy North Sea

[@OffGridGarageAustralia]

No, never done such a test. The AL bus bars are usually great on these studded terminals. The contact area is tiny but the 4Nm of torque gives a very high force. I have tested this with over 230A with these terminals. Works great.

[@Allgaier-nr9hj]

Hi Andi, keine Kontaktprobleme mehr mit den Buzzbars -> Aluminiumoxid hat eine schlechtere Leitfähigkeit als Aluminium. Also habe ich mit einer rauhen Flanschmutter erst mal die Aluminiumoxidschicht der Pole entfernt. Dann die Pole und die Buzzbars mit Alkohol entfettet bzw. gereinigt und sofort mit dem entsprechenden Drehmoment angezogen. Super Kontakt - hatte bei allen 112 Zellen keine Probleme mit Erwärmung oder schlechtem Kontakt. Schöne Grüße...

[@OffGridGarageAustralia]

I had only temporary success with paste. Best result over tie was nothing at all.

[@ChampionCCC]

Top class video. Perfectly and clearly explained Can the JK calculate the Capacity of a pack ? Or what is needed for it to be able to calculate the capacity ? Of how can we use the data to calculate or better estimate the capacity. I have a 16s4p pack which "should" be around 40kWh, but I know it's less, but I'm struggling to understand how to find out what it's real (or close to it) capacity is Keep up the fantastic educational videos

[@OffGridGarageAustralia]

Thanks a lot for your feedback. The JK is capable of measuring the overall capacity of your pack. Fully charge and discharge until you hit UVP. That should show the real capacity of your pack then.

[@DanBurgaud]

13:06 why it discharged that much when the whole system is still being charged by the SCC? Of did the SCC changed into FLOAT VOLTAGE (which is lower than the battery voltage)?

[@OffGridGarageAustralia]

One BMS hitting OVP it sets CCL to 0A for all batteries. It then discharged until the JK hit OVPR again as I explained.

[@jozefflak895]

Hi Andy I just now tested my new JK-BMS and 100% SoC setting works now without do this setup in video. Hw ver. V11.XW / Sw ver. V11.287 Its fixed :) Its looks like JK fixed this issue in new models. Only for info bye. Joe From Slovakia.

[@OffGridGarageAustralia]

Well, mine does not work. As I said in the video, some work, some don't.

[@jozefflak895]

@@OffGridGarageAustralia Yeah you have little older Sw version.

[@martinwragg8246]

Another great video Andy, i will give it a try. My problem is i have two batteries with two JK BMS connected on common bus and they charge and discharge unequally 60%/ 40% Amps. I have made all the cabling the same length etc. Do you have any faultfinding suggestions I could try. Thanks Martin.

[@brian1395]

you remind me of a Bald Santa Clause. Always happy and jolly. I wish the best. can't wait for 100k.

[@OffGridGarageAustralia]

Thanks a lot Brian! I'm always happy and jolly. Almost 🎅

[@andrew81632]

Andy I'm using a JK_B2A8S20P. Looks like we are using the same hardware version 11.XW, but my software version is a bit newer, 11.288. My first full test charge it reset to 100% at my SOC-100% value when one cell hit the desired voltage. Oddly I had configured the settings the way JK suggested when I saw you mention it in an earlier video. Not sure if this is fixed or is just a random BMS that works. Thought it was worth mentioning. Too bad they don't have release notes for the firmware version.

[@OffGridGarageAustralia]

Can you give an example with the settings. I don't quite understand what you mean...

[@andrew81632]

@@OffGridGarageAustralia Hi, I was just referring to the descending order. My test settings were OVP: 3.625 / SOC-100%: 3.500 / OVPR: 3.499. You had mentioned the order previously and I happened to set it like that for my charge test.

[@andrew81632]

@@OffGridGarageAustralia I finally had time to charge my battery again today. What was interesting this time was it reset to 100% when the 'remain capacity' matched the total battery capacity. This was unexpected because none of my cells were close to the 100% voltage setting and the battery continued to charge for another hour. The bms continued to display 100% for the remainder of the charge cycle.

[@soundskribble]

Yet another great video Andy! Thank you so much! How are you getting the BMS data in Home Assistant, and especially the Charge Current control sliders?

[@OffGridGarageAustralia]

I'm using the Peter boards for that: kzbin.info/aero/PLPomydD54sgAEMzjpqhdk8Xu3zNth41Vw&si=X9j6q6tBfwAzEQ5e

[@lotsad1234]

Great, i did that a few weeks ago and it worked, but i didn't knew why started to work haha

[@OffGridGarageAustralia]

Now you know!

[@lotsad1234]

In the 2 or 3 weeks that have passed since this reset, the bms drifted to about to showing 76% with max charge... i just have 2 identicall bms but one is 1 month newer and it resets to 100% with the parameter as it should v11.287, the older one drifts like crazy (that one doesnt have the reset voltage V11.261)

[@AddielHernández-x6e]

Hello, I have one powmr sunsmart sp5k. I would like to know if the jk bms works for this hybrid inverter. Does it comunícate through rs485 port?

[@alanblyde8502]

congrats of your 80.4k Andy will you be testing Clarkes bbms in the future?

[@OffGridGarageAustralia]

Thank you. No, I won't. He got in contact with me very early days but I don't like to promote paralleling different chemistries. It is not working well and causes issues. It's not great.

[@WintedTindows1]

can I ask why we should NOT charge to 3.65v? I'm new, thank you for the help your chan provides

[@jawata58]

great! I had since a longtime this problem! Is there somewhere a good tutorial or video how to get the JK BMS in Home Assistant? thanks!

[@OffGridGarageAustralia]

Depends how you connect the JK and to what. It works quite easy with Victron Venus OS and HASS Victron Modbus integration

[@jawata58]

No Victron here, I'm trying to get data out of JKbms with a RS232 to USB adapter but no succes@@OffGridGarageAustralia

[@mflo1970]

Andy un saludo desde España por aquí eres the King

[@ken-w]

God bless you 8:48

[@clarencewiles963]

JK needs to call Andy to get updates 😂

[@OffGridGarageAustralia]

Hahaha, they do sometimes...😄

[@alexsimmons1803]

Instead of mucking about with the BMS on my PACE units (which I don't have ready access to), I just occasionally increase the charge voltage setting on a nice sunny day (which I can do via Home Assistant). In the same manner it then resets the SOC to 100% when it hits cell OVP and then I put the charge voltage setting back down again. An occasional charge to 3.65 V is no big deal. Indeed I may even automate it in Home Assistant.

[@OffGridGarageAustralia]

Yeah, that is the brute force method. Like causing the main circuit breaker in your house to trip just to see if it still works.

[@Datvi]

Which parameter on JKBMS is the charge voltage setting? OVP? OVPR?

[@camelbakbfm]

how to limit charging cell (in pack with BMS) to 3.38V when I use socket charger? Changing BMS setting OR maximum voltage of charger(small potentiometer inside charger)?????

[@nicolaskahn3996]

Hi, Do you have a electrical diagram of your main installation, I am in the process of resizing for Victron and JK BMS? I searched the old videos but there are way too many. Thank's

[@OffGridGarageAustralia]

Maybe this here helps: kzbin.info/www/bejne/iKOrXqB5qa-NhZo

[@cnc_mill]

Danke andy für deine videos. Ich hab das problem in die andere richtung. Bei 3v zellspannung zeigte das B2A noch immer 29%SOC an. So hab ich die CUVP auf 3V gesetzt und die CUVPR auf 3.01v hat wunderbar funktioniert. Nur der inverter hat gespuckt weil die Batterie aufgeschaltet hat. Ich werd mir nurn eine automatisierung machen die das automatisch setzt einmal die woche. Schöne Grüsse von Down🇦🇹 over 2 Down under

[@FredLarssen]

Hi Andy. Great videos! I came across your channel while searching for info about BMS'es, and ended up with JK. My JK_BD4A17S4P did reset to 100% when highest cell reached my SOC-100% Volt setting (3,60V). Cell OVP was 3,70V. Hw version is V11.XW, sw version is V11.287. IMO this should trigger on average cell voltage and not a single cell voltage. My app (V4.17.0) shows a switch labeled "Special Charger On". I have never seen this elsewhere, and have no clue what it means, but setting it to ON turns off the charging mosfets. There is also a related entry on the status page "Special Charg. Sta: Not Plugged". Any idea what this is?

[@chanrio1308]

Andy, there has been a reported bug on setting up capacity of JK Inverter BMS setting it using bluetooth app. It will show but it doesnt actually replaced the setting when checking via PC. For example you chabged to 300ah via blue tooth it will show 300 on bluetooth but when you check using PC it will still be 50ah resulting for battery to get premature full charge. Probably you can test on your next video

[@OffGridGarageAustralia]

How can you check this BMS via PC?

[@tujuprojects]

2:50 why your AC Input has Down Under graph?

[@OffGridGarageAustralia]

I don't have AC Input as such. Victron uses that to display my tilt system power generation.

[@upper_deck]

Hi Andy, I would have given you even more 👍👍👍…👍 above, if it would be possible. Excellent video. I have also asked JK for a solution at their aliexpress store, but did not get an answer. Finally I will get my both batteries to the same state of charge. I am using the model B2A8S200P (most likely also the first generation). These BMS’s are working fine beside the SOC. Until now! - Do you have ever asked JK if it would be possible to update the software for the older devices?

[@OffGridGarageAustralia]

Thank you. The firmware in these BMS cannot be updated as the chip they have used is not re-programmable.

[@ivanvoronkin8258]

Hello Andy! It's Ivan from Ukraine, I love your channel, helps a lot to keep my house ON (really important now). I need advice, considering I have old JK BMS and SOC issue, I'm struggling to build automation which relies on SOC. I desperately tried to reset it when the battery charged. This hack with OVP works, but I'm wondering if I can set OVP to 3.45 and OVPR to 3.40 - permanently. So when my battery reaches 3.45 can I assume it is enough charged and stop charging by BMS. Will it hurt the invertor (Voltronic 5.6) or BMS? Thank you in advance!

[@AERODRONE-o5f]

Have you tried discharging the battery? Does the percentage drop? I haven't (

[@Juergen_Miessmer]

Hello Andy, nothing new. An OVP resets the SOC to 100% - at whatever voltage you set.... But the SOC counter will drift away by time, especially if the battery capacity is not set to the real capacity (not the nominal) of the pack, or the current is not calibrated.

[@OffGridGarageAustralia]

What is over time? Weeks, months, years? So far (8 weeks for me) I have not noticed a drift and the BMS goes to 100% every day. Maybe it drifts in winter when I don't fully charge for a few weeks any more...

[@Datvi]

How to calibrate current?

[@Juergen_Miessmer]

@@Datvi Take care for a constant current. Measure it. Set the current in the BMS to the measured value. For better results do this at diffrent currents.

[@L_O_M]

Phew! Andy finally updated the subscriber counter.. It's been disturbing to watch that wall in the last 10 (++) videos.

[@OffGridGarageAustralia]

Hahaha. I'll do my best😄

[@vonasi2]

I'm afraid it doesn't work me Andy. When I put the OVP back to 3.65V after seeing 100% with 3.451V OVP I never see the 100% ever again. I have two of the JK-BMS's versions that aren't in a black case. In reality the 99% is more correct as at 3.45V we are not 100% charged so why would I want the BMS to think we are anyway? I also notice that OVP isn't hit when one cell hits the voltage of 3.451. I can have several at or above that voltage and nothing happens. The average cell voltage seems to need to be at or above OVP rather than an individual cell. If that is the case then it is rubbish cell protection. I'd be interested in your thought and could you possibly test the version not in a black case to prove I'm not going mad?

[@OffGridGarageAustralia]

Well, it's up to everyone to define 100%. Do you charge always to 3.65V, that would be true 100%. As I explained, I define 3.45V as 100% and want the BMS to show me that. the average cell voltage cannot be above OVP. That would mean some cells will be much higher than OVP which is not posible. The BMS will cut off charging as soon as ONE cell hits OVP.

[@JAN_DB]

As some others also pointed out: this trick works only for a certain time when the %-age starts doing strange things again… I’ve have pulled this trick already a few times but I think now after the 3rd time in about 10 months of use, I kind of gave up to reset the 100% and rather live with it. Looking at the battery Voltage gives me a better idea of the real SOC. I know the Voltages and the charge levels of my 48V battery by hart right now… I really hope that JK starts to listen to us/you at some point. I also tried to get an answer from them regarding this issue and never got any reply. Pitty…

[@OffGridGarageAustralia]

What is this certain time though. 8 weeks in and it still works for me on both BMSes... Yeah, the voltage and current levels gives it away and we know our batteries.

[@JAN_DB]

@@OffGridGarageAustralia I noticed that the %-age go berserk again after my battery goes to 0%. 0% being at 2.8V in my settings. It happens now and then in winter time.

[@velka7a]

Hello, I have a question. I’m using jkbms - jk-pb1a16s10p. With every charge and diagmcharge I’m loosing some % of capacity. If I make the steps you explained will the problem be solved or I have to do this from time to time ?

[@Dutch_off_grid_homesteading]

Heya, I hope jk will come soon with a update for the 100% will work

[@diydsolar]

Andy, will the SOC 100% voltage be as the whole battery? I mean, you configure 3.45v per cell, but only when TOTAL BATTERY VOLTAGE reaches 16*3,45v the jkbms puts the soc up to 100% It makes me sense for me. Have you checked ? Thanks.

[@OffGridGarageAustralia]

The BMS is not really using the voltage to calibrate to 100%. It uses that exact moment to reset and does coulomb count from there. Amps in and out.

[@pulith5220]

This is the same way daly wants us to reset to 100%. Also andy yesterday i found a new thing for me. If i use ferrules in victron mppt side the voltage it shows is higher so i think we shouldnt use ferrules as thats the recommendations from victron too.

[@OffGridGarageAustralia]

Why would ferrules make a difference? I have tested (and still do) one controller with and one without ferules. There is absolutely no difference. My sparky also says use ferrules for these fine stranded wires.

[@pulith5220]

@@OffGridGarageAustralia I think it's to do with resistance that's what victron says in there manual but I also was shocked to see it happen. There was about 1v difference or may be more. The difference came down as soon as I removed the ferrules.

[@pulith5220]

@@OffGridGarageAustralia also forgot to add one more thing the lug I used was a pin lug it's different from what you used.

[@Slavomir-1977]

Hi Andy... I just ask for sure. 🙂 I have a question about JK-BD6A20S10P. Can I set the "SOC-100% volt. (V)" and "SOC-0% Volt. (V)". Does it work well? Does this FW support this option on all JK-BD? well thank you

[@fraserstewart7359]

I noticed something when you do this. If you change the AH of your battery you also refresh the cycle count. it goes to zero again. I now have no idea of my cycle count

[@Slavomir-1977]

Hi Andy. I connected NEEY 4A to my old JK BMS version with 2A balancer. It seems to me that the balancing act is chaotic, as if they are doing it despite themselves. Have you encountered anything like this? Maybe it would be worth testing what is actually going on there.

[@olafmackenberg5018]

Eh Alter, geil! Glückwunsch!

[@OffGridGarageAustralia]

Thanks, Olaf!

[@jacobhn2]

Great video as always. Have you done anything about not having a balancer on the battery pack, you could just monitor the voltage on each cell, when a cell reaches 3.5v or 3.65v you can lower the charging current, I know that it is then the bad cell that first reaches 3.65v and the others do not get a full charge but they will last for a longer time/year, you can always replace the bad cell or mount a slightly smaller cell on it in parallel. One replaces cell if less in % I guess.

[@OffGridGarageAustralia]

Oh, no, no, no... that not how it works. WHY, why would you disconnect the active balancer just to let some cells hit 3.65V??? That makes no sense. A smaller battery in parallel with a larger is a big no no as well. Tested here on the channel.

[@jacobhn2]

@@OffGridGarageAustralia Just thought that the max volt you could charge to was 3.65v for a cell, a balancer is probably an idea.

[@OffGridGarageAustralia]

@@jacobhn2We don't need to charge to 3.65V with these cells to fully charge them. That is just the max, the manufacturer states in the specs. The cells will perfectly fully charge at 3.45V with a bit of absorption time. Lots of videos about that here on the channel...

[@ngocdangdinh9874]

Hi Andy, my JKBD6A20S10P Software version 11.42, hardware V11.XW is not readable with uart-ttl, it shown nothing but time out waiting for read all data command! Would you have any advise? Regarding the SOC, I have little modification for charging, when voltage is below 3.45 and SOC is 100%, I keep telling the inverter to charge and keep the reported SOC to inverter stayed at 98% with reduction of charging current limit battery will be charged fully to 3.45 and reset its SOC!

[@renevandenberg2133]

Hi Andy, My JK-BMS behaves strange. When the battery is discharging the BMS SOC shows 0% and when the battery is running idle or is being charged the SOC is 98% while the actual SOC is about 30%. What do you think this could be? Already asked JK but got no reply and I hope you could help me in this. I must say I did have a short on the 2 blue cables one was connected to the battery minus while the other blue cable jumped out of my hand and hit the battery plus creating a big spark and a destroyed terminal.... Could that have something to do with this strange behaviour? The Voltages and Currents are shown correctly.... Hope you can help me....

[@Bundyblu]

Hi Andy Congratulations on 80K. I also have 2 JK BMS's the same model as yours, but I notice the software is V11.281 and my version is V11.261. Is there a way to upgrade the software on the JK_BD6A20S10P BMS. Thank you and keep up the great work. By the way the version V11.261 does not have the 100% SOC setting.

[@OffGridGarageAustralia]

Thanks a lot. Unfortunately, the software on the BD series BMS cannot be upgraded.

[@Bundyblu]

@@OffGridGarageAustralia Thanks Andy

[@Sila_energy_alternative]

Здравствуйте, вопрос , можно сбросить jk bms кнопкой на заводские настройки ?

[@mlynek250]

what about 0% voltage ? can i calibrate this voltage level ?

[@martinsteffens3400]

Hey Andreas, ich glaube du musst OVP und OVRP deutlich näher an deine korrekte Ladeschlussspannung bringen. Dann klappt es auch sehr gut den 100% SOC zu erkennen. Ich habe OVP bei 3,55V und OVRP bei 3,51V. Mit einer Ladeschlussspannung von knapp 3,50V erkennt er selber das ab ca. 3,45V 100% erreicht sind. Und mein BMS hat auch noch nicht die "SoC 100%" Option. Grüße, Martin

[@OffGridGarageAustralia]

Thanks Martin. Yeeeeeaaah, I would not like that. OVP should be at the end of the maximum charge voltage. The method I've shown is not a real fix, but more a workaround. At the end it's up to JK to fix their shitty software!

[@mrx7956]

I also have a 1st Gen JK-BMS and have an issue with it, when it goes to Cell UNDERVOLTAGE protection for some reason it also prevents the battery from being charged, even the charge switch is indicating ON and only Discharge indicates OFF. Has anyone experienced something similar?

[@OffGridGarageAustralia]

What hardware and fw version have you got?

[@mrx7956]

@@OffGridGarageAustralia Vendor ID is J-B2A24S15P, HW Ver. V10.XW and SW Ver. V10.08 from 2022

[@alikayacan6768]

Hi, Andy New Project for us. Standard JK BMS test with Sodium Battery set of 16. Pleaseeeee

[@OffGridGarageAustralia]

Well... the video is out.

[@carljohncoronel3754]

can you do find a bms of shoto sda10 48v150 sir? thank you!

[@niclas.lindstrom]

What if you hit a real cell over voltage protection situation now at 3.65v? Will the SOC-100% trigger change back to 3.65v then?

[@Juergen_Miessmer]

The SOC is not set to trigger at a voltage by this action - it is only set to 100% once. SOC is calculated by in and out going amps and can only be correct, if the capacity is set to the real capacity of the battery and the current is calibrated.

[@niclas.lindstrom]

@@Juergen_Miessmer Ok, so you need to update the capacity to enable the BMS to store a new SOC-100% once again at COVP. I hope it is actually storing the total voltage at that point in time, as if it after that point only relies on in/out calculations it will most likely drift off over time.

[@grumpy-badger]

The Papersheet with the 8 is upsite down.

[@OffGridGarageAustralia]

😉

[@michelgonzalez8293]

se me olvido mi contraseña del jk alguien sabe como restablesela es la del blueto no la de la configuracion

[@JMS7410-]

Can the firmware be updated on the JK_B2A24S20P BMS? I have V11.XW HW and V11.26 SW.

[@Rick-wy4od]

No, unfortunately. And I have two of these (supposedly with the same hardware & firmware). One contains the 100% SOC voltage setting in the menu, the other doesn't 🙄

[@LukemM-y8k]

What is the best app to use

[@benoitbenoisbenoistchaine]

Congratulations rich man 🤪

[@OffGridGarageAustralia]

I wish😄

[@LucianIoanMelinte]

Since we are talking about tricks, does anyone know how to empty the log of a JK BMS? Mine reached the limit of 50 entries and to my surprise it does not delete old entries automatically nor allow manual cleanup.

[@OffGridGarageAustralia]

What JK BMS?

[@LucianIoanMelinte]

@@OffGridGarageAustralia "JK 2A active balance 4s-7s/8s 200a 24v battery board management system smart lipo/lto/lifepo4 bms for lithium ion battery pack " is the product description. Bought in December 2022, Hardware version V11.XW, Software version V11.17

[@stevenfrazier8939]

Will the new inverter JK BMS communicate with LuxPower inverters

[@OffGridGarageAustralia]

Will it?

[@solar24gr]

Hello Andy,how i can to reset the cycle counter?

[@OffGridGarageAustralia]

It seems to reset when OVP is hit. Another software glitch in JK's software.

[@Juergen_Miessmer]

Change the capacity setting like Andy did at 9:00. Hitting an OVP will not affect the cycle counter.

[@ThomasWetterer]

I use a node red workflow to reset to 100%. If the voltage of the akku is reached, the current is less than 0.4 i.e. and the battery has 98% or less, then i set the OVP to something like 3.45V. Then after JKBMS resets to 100% I set the OVP back to 3.6V Btw. Serialbattery has also a feature to reset to 100% by loading to the OVP once every couple of days. I use a D1 Mini ESP 32 which is flashed with esphome-jk-bms. This connects via bluetooth to the jkbms and allows to change every parameter from remote. Everything is integrated in homeassistant from where i cann access everything via Node-Red

[@anacronataff1]

What? Please describe in more detail!

[@michaelnarr7554]

Hi, I’m also interesting in this way. Who do you can set the OVP with Node Red? I did’t found a command like this.

[@ThomasWetterer]

​@@anacronataff1 See my answer to michaelnarr7554

[@michaelnarr7554]

⁠@@ThomasWetterer Dein Name klingt so Deutsch. Ich kann deine Antwort nicht sehen. Kannst du sie mir bitte kopieren oder wiederholen?

[@ThomasWetterer]

@@michaelnarr7554 Habs oben in meiner Antwort ergänzt. Irgendwie werden meine Antworten nicht gezeigt.

[@Oli83two]

Nice trick... here is new content for you, andy: if this trick works also at the seplos 10C bms? I already have this problem with my seplos. I have to touch the OVP to reset to 100% or to stay for more than one hour at maximum charge voltage. So the seplos charges most the time only till 98 or 99 percent... ☹️

[@OffGridGarageAustralia]

Seplos is lost! Their software is so far back. I'm testing the V3.0 at the moment for someone. What a piece of garbage that is. The software is so bad, I just don't want to use it at all. It's not worth it!

[@Oli83two]

I have self-made the hole battery pack with cnc milled mounting for the bms, so I have to life with it😅🙈 My biggest problem is the deviation with these shitty four cells anyway... I'm in contact with gobelpower now... if this is solved I can life with 99% soc... because I have no packs in parallel... Greetings from Germany 🙋‍♂️

[@Rick-wy4od]

Triggering cell OVP just to reset the 100% SOC is just stupid imo. I wish JK would just acknowledge that they screwed this up and fix it.. I know that you can't upgrade the firmware in these units, but there's no excuse not to implement a fix in newer hardware. I've got two JK-B2A24S20P BMS units. They both have the same hardware and firmware versions (supposedly), yet one contains the 100% SOC voltage setting in the menu, the other doesn't 🙄. I'm not even sure the one that does, even operates as intended. It's a real shame because JK have nailed most of the other BMS functions and their active balancing is top notch.

[@McGlenWin]

Thank you very much, it works fine 😀

[@williamhuylebroeck9668]

Hey Andy thanks for all the cool and educational videos. I have been following you for a while and have already been able to fix and improve many things through your contribution on KZbin. But now I have a problem that I would like to share with you. Maybe you can help me? The problem is the following, when my SoC is at 40%, my MPPTs are automatically dimmed to approximately the AC load that is required at that moment. I also have a video for clarification.

[@williamhuylebroeck9668]

I sent you the video via email

[@TheRonskiman]

Give the flexible copper bus bars a go, the one with the orange heatshrink on. I used them and they've been perfect. 19,500 until that magic 100,000 subscribers.

[@OffGridGarageAustralia]

I have some flex bus bars here!

[@anacronataff1]

I have tried this several times. But after I reset the OVP to 3.65V, it never shows 100% again. The percentages keep going down. So the BMS is showing less and less percent even though it is almost full. I have to keep reaching OVP to get the BMS back to 100%. My version: JK_B2A8S20P HW V11.XW SW V11.17H FoD 2022-09-01 V4.8.1

[@vonasi2]

Mine does the same. As soon as I reset to 3.65V OVP my percentage drops to 99% and I never see 100% ever again. Also I can have several cells at or above OVP and it does not trigger 100% until the average cell voltage is above OVP.

[@OffGridGarageAustralia]

Don't you have the 100%SOC setting with such a new hardware? You need to run the latest JK app...

[@vonasi2]

@@OffGridGarageAustralia I'm on V4.19.2 on an old iPhone. No 100%SOC to be seen on it. My hardware is V11.XW and Software V11.17H

[@anacronataff1]

@@OffGridGarageAustralia I am using V14.16.2 downloaded from your site. And yes, I don't have a 100%SOC setting!

[@ThaVoodoo1]

If only Victron would make an active balancer BMS that can be retrofitted !.

[@OffGridGarageAustralia]

What's wrong with the NEEY?

[@TheBelcherMan]

80K, should be 2M!

[@OffGridGarageAustralia]

Thank you. It will be a while until then...😉

[@GrahamDyer]

Awesome Andy, unfortunately this also resets the cycle count so if that's important to you then just make a note of your cycles.

[@OffGridGarageAustralia]

Yeah, I saw that... It does it every time it hits OVP. How good is this software, ey?😄

[@olafschermann1592]

Thanks 4 sharing

[@OffGridGarageAustralia]

Thank you.

[@DeophobicMind]

18:35 until we run out? for solar alone (or renewable energy), new technology is being developed every day, you'll never ran out of content. Hoping for the next months to come you'll get a hand on a Sodium-ion battery to play with 😆

[@OffGridGarageAustralia]

We will never run out, no, hahaha😉 Sodium... good idea😄

[@tomassliauteris884]

You are OSOM!!!🎉🎉🎉

[@OffGridGarageAustralia]

Thank you!

[@cliffordwheeler7662]

I lost the password to my JKBMS, and can't access the controls. How do I reset the passwords to the older BMS? Please help.

[@grumpy-badger]

You can read the pw via BT. Esphome-jk-bms will show it on its webseite.

[@anacronataff1]

1234 or 123456

[@OffGridGarageAustralia]

1234 for Bluetooth pairing 123456 default for changing settings