New JK-BMS V14 and V15 Firmware with advanced Charging Algorithm and... a new bug?🙄

[@MsNVvK]

Mario Hoogenboom (NL) has figured out in his blog that the relays may or may not switch because of insufficient control voltage on the relay coil. Sort of 9 volts vs the required 12 volt.. He actually modified the board (really high tech soldering) to increase the voltage to 12 V. Some older bms'es hd this fault, the newer seem to be better.

[@JdZ-2023]

Yes. He discovered that the SMD resistors that drive the opto-couplers in the relay circuits are too high, and due to its ratio of 200x, the current through the relay coil is too low. Instead of the 500 ohm, it needs 220 ohm. You can solder a 390 ohm parallel over the existing 500 ohm resistors or replace them for 220 ohm. The first way is easier to achieve. The second way requires more tools and craftsmanship.

[@hansenmoniquefilms]

@@JdZ-2023 Nice work, can make you a drawing so i know where to do the second resistor thx Hans

[@ThePetervangils]

Yes, Mario fixed this. He has his own YT channel. In part 5 of his powerwall movies he shows how he fixed it.

[@ThePetervangils]

If the current through the relais is on the edge to makenit switch, then temperature of the driver of the relais may cause it to work (or not): at low temperatures it might not work and at high temperatures it might. Temperature affects the current gain of the driving transistor of the relais.

[@marcusr8524]

Alter Schwede, wir haben die letzten paar Wochen vielleicht 3 x die Sonne gesehen, beneidenswert. Nächstes Jahr werde ich auch neue BMS einbauen und dafür sind deine Videos Gold wert, danke für deine Mühe und Gruß auch an deine bessere Hälfte aus AT.

[@derfreiemensch]

Das neue BMS wird die Sonne bestimmt zurück bringen, das jetzige BMS scheint ja total zu versagen. Die Investition wird sich bestimmt in 20 Jahren rechnen, wenn man bedenkt wie oft die Sonne dank des neuen BMS scheint. 🤣

[@olafschermann1592]

🤣😂🤣

[@tomberger6484]

@@derfreiemensch Welche "Investition"? Kostet das Update der Firmware was?

[@launacorp]

@@tomberger6484 nein! Ein neues BMS kostet. Das alte fliegt dan raus. So hab ich das verstanden

[@SimonKasper]

Thanks!

[@OffGridGarageAustralia]

Thank you very much! 🙏

[@SimonKasper]

Thanks for staying in touch with JK and getting the v14 hardware an update as well! This is very much appreciated! I can tell you that the dry contact bug is not happening for me. I'm using both dry contacts on my two V14 BMS batteries for starting a fan to cool the battery and bms when either the battery temp is too high (DRY 1) or the BMS mosfet temp is too high (DRY 2). I confirmed today that both contacts on both systems are working fine. This is still with old firmware though...

[@aniketos7336]

have you tried the contacts with a heating pad? the old style jk's the heater doesn't turn on until under temp disconnect. Andy hasn't tested that function on the inverter style yet

[@noxikid]

​@@aniketos7336do they suppose to switch on earlier? When?

[@aniketos7336]

@noxikid ideally you want the heaters to turn on sooner to keep the battery from turning off charging. I use external relays on my batteries that turn on at 5c, that way the cell temps never hit 0c.

[@OffGridGarageAustralia]

Thank you for testing, Simon. Where did you get your BMS from?

[@SimonKasper]

@@aniketos7336 I'm not using the heating function so I can't tell you.

[@Carsten-PV-DIY]

Nice introduced and realized logic Andy. Well done. Thanks for not giving up and supporting the Community from your home country and the wild north (Hamburg). ❤🎉😂😂😂🎉

[@peetsplcchannelnice6912]

thank you Andy for your tireless efforts. Andy, you are the JK-BMS king

[@OffGridGarageAustralia]

Hahaha, thank you. Man, it takes so much time to do little baby steps but we will get there eventually.

[@reflections9409]

Thank you so much Andy for your hard work! I can now return my Victron system to BMS control, as this works best when you have multiple packs in a bank, total hero sir!

[@OffGridGarageAustralia]

Thank you! Yes, it works very well with the Venus OS now and shouldn't cause any issues.

[@Григорий-о9о7у]

Good day. Suggest to developers to add a function of decreasing the permitted charging current when approaching 100%. For example, Continued charge current is set to 50 A. When charging from 0% to 90% SOC, the value transmitted by the BMS to the inverter will be 50 A. Then it will decrease proportionally to 5 amperes to 100% SOC.

[@claudetrichet2829]

Was thinking the same a while ago. In this case the balancer has more time (read:capacity) to bring the cells at the same SOC. It causes the cell voltages not to get too far off from eachother.

[@cpirius]

Andy! Thanks so much for working with JK and doing all this testing! I sent you a S.P.A.T. 🍻

[@OffGridGarageAustralia]

Cheers! 🍻

[@ppi57]

Without further "to do", I send you my Thanks! ☀

[@OffGridGarageAustralia]

Amazing! Thanks a lot for your support.

[@SunSin91]

Love your geeky videos testing these things. I myself got a campervan. Bought 8 eve 280ah cells and connected a Daly 4s into a 2p4s configuration 12v, which operates straight into my camper thanks to all your videos I’ve been watching over the years :)

[@GregOnSummit]

I think they're missing something in the flow chart at <a href="#" class="seekto" data-time="1114">18:34</a>. Step #2 sets a timer for 1 hr, then does a voltage check, and if true, then sets SOC to 100%. On #2, I think you need the timer but also a voltage monitor. If voltage drops below a certain threshold, then restart the timer. Threshold could be a calculated value. Maybe 55.2v - .05? For example, maybe a short heavy load came on? If voltage goes under the calculated value then reset the timer, otherwise keep it running. This should make sure you're getting the full absorption time in, without having to wait a full hour to check it, and possibly restarting the full cycle over again.

[@ianloy1854]

You show what the internet/YT are at their best. Informative and sharing all that you know. Thanks so much.

[@OffGridGarageAustralia]

Thanks a lot, my friend. I really appreciate your kind feedback.

[@brian1395]

ok i am a long term suber. I have been with you since the original tote build and relay problems, maybe sooner but i am old and cant remember any more far back. I just ordered 4x yiging battery box sets v2 with mb31 314ah eve batts. total cost $5996.00 they will be here in 3 weeks. I just wanted to say thank you cause i have been waiting a long time for a Andy approved diy box set.

[@petrkroupa1798]

I updated all my 4 JK version HW15A (150A/2A balancer) and both dry contact works with no problem. I'm really glad you managed to solve it with JK. I was slowly losing hope. 🙂

[@typxxilps]

Finally - looks like a great progress - with new step back but to be honest: it happens always this way more or less, or ask Tesla friends how often updates have cause bugs Tesla calls features. Great progress and I hope that JK will continue to stay in touch with you and the community.

[@HippocratesGarden]

Bug? naww.. it's an "artifact of the database design" (actual response from days of yore when I worked in I.T. )

[@Roumano]

Thanks for the testing and for all details. Specially for winter season, between step 5 & 6, i would like to see a new step/function : My battery is sufficient top balanced ? via a new setting : Max Delta (like 10 mV) Step 5.5 : If V Cel Max - V Cel Min > Max Delta : Go to step 2 : "Start RCV Time", to permit finishing the top balance Step 5.5 : If V Cel Max - V Cel Min < Max Delta : Go to step 6 My last full charge take more than 3h30 to finish the top balance as it's wasn't done since few months (i've anticipate this and disable the float mode and ... )

[@NiueChannel]

agree, good idea! also, in addition: why not to use the built in "current limiter" to reduce the charging current for better balancing (to allow the balancer be able to catch up), after certain level (not by the pack total voltage but when at least one of the cells are very close to 3.65).

[@Sydney_Innovations]

Hi Andy, Thank you for doing all the JK BMS investigations. Still running the V15.27 in the GoKWh battery and the version has been very stable. I may upgrade to a later version in the near future.

[@OffGridGarageAustralia]

If it runs stable and you get all the features you need, I would not upgrade it.

[@TrevorFraserAU]

Love your work Andy!

[@dennisdejong3419]

Hi Andy. Do you have a new set of parameters for the eve 304ah cells? My settings differ from what I saw in the video. Want to check out the differences. Perhaps a new video for the optimal settings?

[@beebop9808]

Got 15.35 loaded in my boards and I'll test tomorrow when I can reach the top. Hopefully this update will help me out with my inverters. Mine are among those that chop off the charging when the BMS reports 100%. They don't support absorption or floating for Li batteries. Hopefully they are responding to the RCV? I'm not sure of that at this point. But this update backdoors the inverter at least forcing absorption where the cells can be balanced. I've got nice cells and they aren't far off from being balanced when they get there as it is. If I can get that far, floating really doesn't matter. The inverters don't use the batteries at all until available solar drops below demand. Fingers crossed, see how it goes tomorrow. Think we've got some sun coming? Setting at about 96% now probably high 80's by morning. You're a gold mine brother! Don't let anybody tell you different!

[@robby60259]

Currently I think the dry contacts is the better way to activate the cell heating pads. If you use the intended heating circuit the alarm activates the heating pads, but the alarm also prevents charging. I do like the fact the heating pad port reports the current, however it would be better to have two alarms, one to activate the heating pads and another to prevent charging if the heating pads fail and the temperature drops too low.

[@olafschermann1592]

I think so, too

[@007silverwings]

Hey Robby, which heating pads are you using? Thanks

[@007silverwings]

@@robby60259 okay great. I assume you had the custom made? Pleased with the reliability and performance? Are these controlled by the BMS or by something like Home Assistant? Thanks.

[@aniketos7336]

@@robby60259 ive mentioned this issue a couple of times but gets missed. Dont know why the devs havnt thought of that already

[@adrianmifsud80]

Mine is hardware version V15A and just upgraded the firmware to version 15.35. The dry contacts are working. Both turn on and off as requested. I dont have a use for them yet but good to know they work.

[@OffGridGarageAustralia]

Thank you for the info. Where did you get your BMS from?

[@DanBurgaud]

<a href="#" class="seekto" data-time="1765">29:25</a> Dry1 and Dry2 contacts on all the Yixiang JK Battery Boxes dont work for me. But Dry1 of a separately purchased JK from Alibaba worked. Did not test Dry2. I intended to use Dry contacts to turn on a vent fan. Ended up using ESP32 for that purpose.

[@OffGridGarageAustralia]

Same problem as I have. I believe Yixiang are getting the comms board and cabling from a different source. This could be the source of the problem.

[@leumel900]

Has there been any improvement on the 100balance BMS, especially concerning the balancing? What about firmware updates? Apparently they now also offer a additional communication board for connecting to inverters, just like the JK-PB ("Inverter-Style"). Maybe it has potential to one day compete with the 'king'?

[@OffGridGarageAustralia]

100Balance will disappear from the market again and DALY will take over with this technology and active balancing. That is my prediction.

[@leumel900]

@OffGridGarageAustralia That would be a logical step for Daly, I don't get why they didn't do that in the first place. Why create a whole new brand if you have one, the people already know well? What about the JK-PB? Any chance that there will be models with higher current than 200A?

[@jcgcs]

Hey Andy, nice! But RCV and balance voltage the same? Any news about the in and export function?

[@OffGridGarageAustralia]

RCV and balance start voltage can be set differently if you like. I have mine sitting on the same value as I only balance cells which are over the set charge voltage. If they are under this voltage, I don't need to balance them, right?

[@jcgcs]

I wil test. I can not upgrade my bms, device identify not same to connected device! Error Using the latest 200A bms

[@typxxilps]

<a href="#" class="seekto" data-time="740">12:20</a> - not sure if all is fixed regarding dry contact 2 cause you have only checked the activation but not if the release of 3,2V would also work. Or at least you did not show that test in the footage.

[@michalfurberger511]

When will you test brand new ENJbms series from JKBms ?

[@gandalfstormcrow9605]

Hey Andy: I have the six Victron solar charge controllers that do the charging as my current Growatt inverter does not like to talk to the BMS. I have changed to all Ver 15A 200Amp inverter BMS's on all three batteries. The GX on the Pi reports the batteries (via CAN) just fine. Up to this time the charge controllers have been monitoring the Smart Shunt for voltage and they control the absorption time and float voltage. Can they be controlled by the BMS instead?

[@SplendidHorrors]

Thanks for your video. Now wondering do I need lynx shunt at all, once BMS more or less precisely show SOC? As once you said it might be just very expensive fuse holder...

[@GrandPoohBah]

Awesomeness Andy!! Not sure if you have tried this yet... Connecting the JK Inverter BMS to a Victron VE.Can Solar Controller then to a Cerbo GX where it terminates. I'm waiting to see this done by someone before ordering a new solar controller.

[@spaced82]

Bug or feature? Just built my 2 16s BM31 with the JK JK-PB2A16S-20P hw v15a, firmware v15.33. Upgrading from 48v 580ah AGM for my offgrid cabin I have heatpads installed. Testing the heat feature I found that if the charge current is lower than what the heat pad uses (2a), the bms supplements the heatpad with power from the battery. Not optimal during winter in Norway.

[@TheTurbotommi]

<a href="#" class="seekto" data-time="618">10:18</a> but it further doesn’t show in Alarm which pack causes the alarm. Pack 0 or pack 1 😢

[@OffGridGarageAustralia]

I don't think this is implemented in the communication anywhere. Unless you can tell me, where in the CAN communication that is, I can pass this info on to JIKONG.

[@TheTurbotommi]

@ If they just send an enumerated Alert e.g. 1 for under voltage, 2 for over voltage etc. and Victron can translate it back into a prepared message, then it will be not possible. But I doubt they do. I assume they send an alert and a string/text that is simply shown then. In this case the BMS could add the pack number #0 or #1 to the message

[@TheTurbotommi]

@ I finally got confirmed that my 2 Xing-irgendwas DIY boxes with JK-BMS are sent out. Maybe I can find out something with a CAN Sniffer as man in the middle. But Jikong should know what they currently send over CAN, isn’t it 😅

[@duncanstirling6643]

Is the engagement of the timer function increment and the length of that timer increment at issue due to the length being highly affected by the environmental element factors that the battery is being placed into?

[@rednadz3889]

Question to the JK community: I have already done over 20 projects for battery cases (fishing and boats). Almost all of them with the JBD BMS, where the loss of capacity is very low if not used for weeks or months (measured by the voltage of the cells). Now I have done a project with a JK BMS - there the loss was almost 30% in just under 2 months. Since I sold the battery case, I can only test a few things. Can anyone tell me what options there are to minimize the loss of capacity when storing a battery system with a JK BMS? Are there parameters that can be used?

[@nikoszafeiriadis8619]

Hey Andy, thanks for all your videos. I just had a thought, what about to have an custom option in the menu of the bms, I mean like the other tabs (Lifepo4, LI-ION etc) but one for our settings. greets from Greece

[@lkjaer]

Hi Andy SUPER great news on updates for the BMS V14/V15. Looking forward to start updating. Here in Denmark and it’s about 0A outside season, bringing me to my issue. Is there an “easy” way to program charge voltage (CVL) to be overwritten by Victron, maybe using NodeRed, if supplementing battery charge during low tariff hours, low tariff hours can easily change from one day to the next, so could see a problem in finding a great setting for the timer setting returning from float to bulk charge. Anyway, I most likely need to use NoteRed to implement battery charge from measure AC on grid meter, have old AC coupled 3p inverter that I don’t want to touch. Sometime grid feed-in is at a cost to me, this I want to limit to highest possible degree. The negative grid feed-in price is mostly during high peak solar production to grid in summertime’s but also during nighttime during wintertime’s where wind power production is at a high. System info: MPPT, 6kW 3p inverter, 3x MP2, VM-3P75CT, 3x YIXIANG DIY (likely V1) and Cerbo.

[@Kimulstein]

Have you tested DESS mode from Victron?

[@OffGridGarageAustralia]

Good point if you are floating and want to end float mode early... I'll put this on my list to discuss with JIKONG.

[@lkjaer]

@@Kimulstein On this setup and old agreement for grid feed-in, energy that has been stored on the battery’s cannot in any way be exported, I am allowed to export max 6kW from old inverter take directly from solar array nothing else.

[@lkjaer]

@@OffGridGarageAustralia Maybe my way of setting it up is so “special” that it does not make any sense to make changes in BMS, don’t fix something that is not broken, maybe a new fault is sneaking in if more feature is build in.

[@Kimulstein]

@@lkjaer what about only a virtual switch for charging (like you would set up a generator, but it’s feeding from your grid) at set parameters?

[@Vinc3nzo87]

Hi, the SOC of the Jk-bms correspond to the smart-shunt victron?

[@HybridShedIraq]

Thank you Andy, I tried to connect communication with my new 12kw Luxpower inverter the problem is that once it reaches 100% it drops charge to float mode no timer. I didn't test the JK new firmware but at least it should be kept to 99% until the reset timer is met.

[@ВладиславМартишев]

They have added luxpower can protocol, try to use it

[@HybridShedIraq]

Yes i updated to version 14.24 it shows luxpower now i can kiss jk a#$$ every think works very well except the requested charge voltage i had to calibrate the bms voltage little bit higher than the charge voltage for it to register above RCV. ​@ВладиславМартишев

[@robby60259]

Can JIKONG add a second alarm to activate cell heating without disabling charging?

[@juergenseidel]

I`ve just updated my V15A to 15.35 and both dry contacts are working fine. I can also hear the relays clicking. 🙂

[@OffGridGarageAustralia]

Thank you. Where did you get your BMS from?

[@olafschermann1592]

Which hardware Version was/is affected by the bug where the BMS looses it‘s configuration when off power for a couple of hours? The fix in software was just for the new default values, right? Do the new defaults still apply to LTO cell types (which very very few use - if anyone)

[@OffGridGarageAustralia]

That is the problem, the BMS which work are V15A, the same as the ones which don't work. Ah, the default values... I gave them some standard settings for the LFP profile but haven't tested it yet... LTO was more a fail-safe if the BMS resets.

[@MMMM2MMMM2MMMM]

Dear Andy, please do test the heating terminal too! Alarms and triggers are different in the app and on the PC.

[@OpenSolarEnergy]

Hi Andy, if you have time, YamBMS could be fun to try 😊

[@bogdanverezberger1873]

I am using Yambms and indeed the charging logic far more advanced than JK, remote acces to BMS settings from everyere, shunt integration and other function like force charging are great and worth the attention if you have Home Assistant.

[@cgutowski471]

+1 for YamBMS. Works great with older non-smart JKs for Lux CAN interface. Might be time to upgrade to inverter JK with better firmware and YamBMS /RS485 as backup.

[@OffGridGarageAustralia]

I had a look at this a while back and it is a tinker solution, very complicated and not user/beginner friendly. A lot of external hardware is needed and the documentation is not great. It would mean reading through forums for hours to get the right information. I'm not a fan of these 'solutions' tbh.

[@OpenSolarEnergy]

@@OffGridGarageAustralia I spent a lot of time creating the doc on Github. The situation with Atom S3 is easy, it fits together like Lego, only one Atom S3 is needed to supervise several JK-PBs, for someone like you it's very easy, I'm surprised by your answer.

[@OpenSolarEnergy]

@@OffGridGarageAustralia I spent a lot of time making the doc. The solution with Atom S3 is easy, it fits together like Lego, only one Atom S3 is needed to supervise several JK-PBs, for someone like you it's very easy, I'm surprised by your answer.

[@aireslimadatrindade4932]

Great! With these new features in JK BMS, do you still need the Peter’s board interface?

[@clarencewiles963]

Stay tuned till the vacation is over and Andy can continue. Thumbs up 👍

[@OffGridGarageAustralia]

Thank you! I'll be back soon!

[@iPeel]

Looking forward to testing this as my inverter is one that stops charging when the SoC is reported as 100%. I wish there was a way of updating the firmware on ID0 without changing the dip switches as my control board is buried inside the chassis on the case design of my batteries so I currently have to disassemble the whole solar system and remove the lid from the battery to update the firmware!

[@andreasziegenfeldt8319]

It would be nice if we could get all your settings now with the last update and the added features.

[@Fiat_Racing]

I checked the new firmware, the Growatt inwerter only shows the charging percentage of the battery, but the RCV timer does not work, as soon as the battery is 100 percent, the inverter stops charging... I have a Yixiang 48V DIY Battery and a Growatt SPF 12KT HWM inverter...

[@HybridShedIraq]

Dear Andy, I couldn't install version 14.24 on my 14.20 BMS even using force update it stays at 0% several times no luck the bms still works fine 200A version.

[@MrRschutte]

did you test what the discharge OCP 2 and 3 do in the contol tab of the app (at the bottom

[@OffGridGarageAustralia]

No

[@MrRschutte]

@@OffGridGarageAustralia is there a reference on what this 2 settings should do? so i can test... have 3x bms 15V..

[@mandimandi2523]

Hi Andy! Did you ever have the problem with your 16S-batteries that the total cell voltage is 0,4V different to the other boxes, even with cells from the same lot? The reason is a non-exact-measuring of the cell-voltage by one of my JK-PB-BMS. So i adjusted the cell-voltage of that pack in the App to get the same 100%-SOC. For the inverter its no problem because the batteries are connected parallel and it measures the voltage of the total packs. As a colleague proposes that the master should get the same JK-settings for the slaves automatically this would be a problem in my case....

[@dmeyer8937]

Hi Andy, I just figured out settings for SCP when using a SWIpower inverter and the JK B2A8S BMS. I commented with the findings on your 2 year old post about all the settings for that BMS.

[@jojonesggeis1888]

Hello Andy, since firmware 15.33 I have the problem that if I set the requested charging voltage in the JK BMS to less than 3.444 V, the Victron MP2 increases its frequency as it should when the batteries are full. If I set it to 3.444 or higher, everything works as it should. What could be the reason for this? Greetings to Australia

[@rappin05]

I have v15 bms's. I had them connected to my Victron system and gave them control. The inverter turned off because it didn't receive data from the BMS in time. Only time I've had an unexpected power outage. For some reason the BMS isn't consistently reporting so I've had to turn BMS control on. I wanted the active control just in case both batteries shut off charging unexpectedly causing the charge controller voltage to spike

Andy! You have worked well

[@ronnyc5542]

I am trying to build a diy battery for my existing solar. Do you know which AC coupled inverter is available in Australia which can use JK BMS?

[@haraldhannelius]

There's now way to upgrade the 4-8S JK BMS:en, is there?

[@76queen]

I’m wondering if the relays needs to have a complete power removal before they will work as required.

[@beest1992]

can you upload the new (hopfully mostly bugg free)verision for all the bms types to your google drive? jks webbsite for the updated firmware dont work, atleast not at this moment.

[@FLOrchardHome]

235 amps. Congrats on 100k!

[@OffGridGarageAustralia]

Thank you!

[@paulsmalser3261]

As someone with 5 V15 of the JK BMS there is one feature I would really like to see in the future. The ability to tell master and slave BMSs to propogate settings changes from master to slaves automagicaly.

[@mandimandi2523]

this would make sense only when you can choose between automatic and manual changes to the slaves. one of my 16S-batteries - all from the same lot - show different cell and total voltage - the reason is the JK- PB BMS. The responsible chip for cell measuring of ONE of my PB-BMS measures a different voltage per cell and in total accordingly..... so one of the the PB`s is "faulty" and i adjust the RCV -Voltage accordingly to match the SOC of the other 16S-boxes.....

[@OffGridGarageAustralia]

There will be an import and export function for the PC software or app in the future.

[@EagleRunningCo]

15.35 works great. SOC resets to 100% and enters float mode. Unfortunately the Float Mode is not reported back to the Victron System. @Off-Grid Garage could you please address this issue. Thanks a lot

[@mosfetkiller3851]

have you tested the A accuracy reading for 2A and less?

[@hansenmoniquefilms]

Hi Andy , About the dry contact bug, its a hardware fault on the print board , there is a resistor of 500 ohm that should be 220 ohm , de voltage on the relay coil is only 7 volts should be 10 volts so replace it or add 390 ohms , good luck its microscopic small , i emailed the JK team about it

[@paulsciberras5105]

Hi Andy Can I please call you as I have an issue where my dc dc charger is putting all amps into 2 cell more than the other 2

[@RFDarter]

<a href="#" class="seekto" data-time="778">12:58</a> how could BatVol ever get > than the RCV??? At best it yould get =

[@xxg4sxx]

Hi Andy, by mine v15A Software 15.35 a problem too, but mine is a little different. Sometimes it triggered and dont release, sometimes it doesnt triggers. On low soc funktion it never triggers. Greetings from not so sunny upper Austria 😅

[@johncampbell2311]

Have fun thanks for the info

[@bimmers323ci]

Andy need some help please with jk bms 150a.I can’t log in to the Bluetooth app,it work for 2 weeks and no it keep asking for pair and when I put in the password it does not accept it

[@robertelmore4758]

Docan is selling sodium prismatic batteries. You should get some and do a series on them for use with a "48v" inverter.

[@andypag1071]

Fyi the expression is "without further a do", but language evolves and your meaning is clear.

[@reflections9409]

😂😅😅

[@kennyrodg]

Cheers Andy and Hi all... Can anyone tell me why there's versions 69 thru 73 for the new V15 firmware ? Thanks.

[@marianilie7321]

can i connect my jk bms inverter 200a to multiplus GX via usb rs485 ? just like ET112 via usb to gx

[@nomanshah6761]

Dear Andy Can you please share the jk bms android app settings for 16 cell bms on your blog, may be in screenshots or some other format Thank you

[@henrikprebennielsen4612]

tak for gode video, Hvad skal Kina gøre uden dig, og vi forbruger, jeg håber de lever op til deres gode service, i DK. koster den samme varer det dobbelt ++++, og under service , og senere er de gået retur.🛐🛐 God jul og godt nytår💥💥

[@OffGridGarageAustralia]

Whatever that means, thank you.

[@NiueChannel]

I was following during all this long journey of developing the better JK inverter BMS , and especially about the better SOC% calculation and all this time an idea was sticking in my mind: why not to add as additional correcting factor the 10%,20%,30%..70%,80%,90% estimated-by-voltage-at-rest SOC% points like the JBD BMS has in their Bluetooth apps, and to make that algorithm even better: just make the software (built in into the BMS) to catch a long-enough period of resting (0A current) and "adjust" the SOC% according to the pre-set via the app voltage points; with accurate voltage measurement points (at rest of course) can add significant correctness to the overall more accurate SOC% measurement; and the longer "at rest" period it can take, the more correct the estimate will be. I understand that it's not the best way but IN ADDITION and in some cases it can help A LOT (I'm using that in JBD BMS-es and that method works good !). Even if not "at rest" but with known certain amps discharge/charge if set voltage points accordingly it also can adjust the SOC% accordingly. So in the app it could be settable both voltage points with accordingly current levels. Once determined and set - it can help adjusting the SOC% significantly more accurate. What about that? To me that idea worth considering! P.S. this actually means that the BMS's firmware should have a feature to set %SOC manually then it can be adjusted internally or even externally. Using above-described logic or other way as well.

[@juergenseidel]

I`m wondering regarding SoC 100% calculation. I currently have 15.33 running and it requires only one cell to reach the configured SoC 100% voltage to set the BMS to 100% SoC. I`ll upgrade to this version and test if it changes. This would be really great. :-) But will need some sun for it in grey, cold and wet Germany. ;-)

[@OffGridGarageAustralia]

Yes, that was the old logic in V15.33 V15.35 brings a new and better solution

[@gianmariacolombo9119]

hi, with v15 and firmware 15.20 I find dry2 not working.... dry1 works correctly

[@owlhollow3992]

Does the app work fine in china ? because here since 5 days now , app works randomly whenever it wants to show up . sometimes in the morning , some in the evening. Is there an upcoming set and forget update ?

[@foggman123]

Andy, I have been asking JK to add a feature to the relays and they have been telling no. Maybe you could help. We have over temp trigger for the relay but it would be nice to have under temp trigger as well. That will allow us to use it as a thermostat to turn on a heater if the batteries get to cold. The current logic for the heater function turns off charging if the heater is on. That could cause the batteries to die from the heat running while there is no sun and when the sun comes out it is still to cold so it will not recharge. With the function on the relays you can have them trigger before an under temp alarm turns off the charging on the batteries. Thank you

[@RobSteve1]

I am new to this as well and living in Canada, it is getting cold. My system is in an out building with the 8s, 24v battery in an insulated pelican case. Prior to moving it outside, I tested the heat function, but came to the same conclusion as you. I set it up on the relay, a low temp option is available in 15.33 at least. I tested it and the relay opens and closes. The heater is connected to the battery positive via a fuse and the negative is on the P- of the BMS. My assumption is when the battery gets a low voltage error, the P- will no longer allow power to flow and the heater will shut off.

[@RobSteve1]

In regards to the heater option of BMS, I was told by Hankzor that your charger is supposed to supply the current to heat up the battery to the point the BMS re-enables charging. The flaw in this ,for my system at least, if charging is turned off by the BMS, the Multiplus turns off charging, so there is no current to run the heater. I was testing this on a bench and have not confirmed if it turns off the Solar charging too. I assume it does. I wonder if Andy can figure this out? Maybe there is a Victron option or setup we don’t know about yet.

[@mateuszmazur1482]

I'm using dry contact to turn on/off heater (via additional mosfet small board from Ali). Works as it should. No problem.

[@DincaSilviu61]

Hi,for jk bms b2a20s20p How can I update the firmware? Is it possible?

[@ThomasNowicki-m5s]

hi what version you recomend to use now?

[@sudosu4133]

Now wait a minute: If a master and slave are electrically connected (in parallel of course) should 1 of the 2 take power and charge when the other doesn´t? What will happen once the disconnected battery reconnects? Wouldn't there flow a large current between the 2 because of the voltage difference?

[@OffGridGarageAustralia]

No, all tested on the channel multiple times. With LFP, there are no large currents with parallel batteries. Also, the JK has a PCL feature and limits the current to 10A.

[@sudosu4133]

@@OffGridGarageAustralia OK, understood. I will catch up with your videos from before I subscribed to your channel. Please keep up the good work! Very much appreciated! By the way. Is the latest version a single binary for all Active balancer amps/Max current combinations? I only see 1 v15 version on your drive folder.

[@OleksandrPliuta]

Hello. Andy. Could you share a contact of JKBMS support? They don't answer on requests about an error in MUST CAN protocol implementation. Thanks.

[@OffGridGarageAustralia]

Very difficult. JIKONG is the manufacturer of the BMS, JKBMS is the reseller on AliExpress and Alibaba. Both are not great in customer support.

[@mrx1979ua]

I wonder how resetting SOC0% works in 15.35. Cause in 15.33 it does not set or reset by reaching a set SOC0% voltage by a LOT. Mine shows 0% with at leave 0.3V left in the weakest cell

[@bimmers323ci]

Hi again the 3 dots on the upper right side when I click on it nothing happens no information

[@stephsoltesz6731]

Have you restarted the BMS' which had the dry contacts stop working ? Try it with one & see if it makes a difference. Also, have you noticed how low the amperage read the BMS can detect or is it still capped at 0.3A in or out ?

[@OffGridGarageAustralia]

Yes, restarted and even disconnected altogether, no difference in mine. Current threshold is still the same from what I could see,

[@RFDarter]

<a href="#" class="seekto" data-time="1919">31:59</a> So i would supect the comm board. maybe the traces are different, yould einfach check that

[@AndymitUepsilon]

SOC 100% ?😂 🇩🇪 is Winter ❄️ Valley of tears 😭😭😭 Kannst du mal die bms komplett stromlos machen? (Also kurz abklemmen) bei meinem Display half nur das. Das zeigte anfangs nichts an.

[@madnessy9842]

After updating to 15.35, the BMS turned off after a few minutes and the resistance readings of the balancing wires disappeared. These manually entered parameters are not displayed, although they are present in the BMS memory. The BMS gives error code 8. Has anyone encountered such a problem?

[@windsine]

would be nice to have an option to enter float after: Absorb voltage maintained until cell voltage deviation value has decreased to a set value (across all batteries). Absorb Timer or aggregated battery tail current threshold as a backup.

[@OffGridGarageAustralia]

I'll see what I can do... Sometimes the battery gets discharged again after the RCV timer is triggered and voltage delta goes down again. This could indicate the battery is balanced. There is a fine line of voltage setting, voltage delta and when the cells are actually full.

[@дмитрочащін]

LTO battery switch was on. That's maybe a reason?

[@marianilie7321]

i have multiplus 5000 gx and VM-3P75CT + jk inverter bms. I have only 1 port Ve Can set to Can bus and VM-3P75CT force me to connect via Lan and is instable without internet. I can connect via usb rs485 / Ve Can to gx the jk inverter bms or VM-3P75CT ?

[@bocharov1989]

Do all of your bms shut down by button after update?

[@RobSteve1]

Mine would not shutdown when I wanted to restart it after updating. The long press of the button would beep as usual, but immediately beeped again without a shutoff. I traced it to having the Solar still connected and providing a charge, which must restart the BMS. When I disconnected the Solar it shut down normally. I had forgot that the Solar charge controller was connected to the power in side of the battery switch, which I had done so I could turn off the power to the inverter but still charge with Solar. Even with the Solar panel disconnect breakers turned off, the charge controllers must have a residual charge that restarts the BMS. Pulling the charge controller fuse allowed the BMS to shut down. These are just the small Victron 75/15 and 100/20 controllers. The behaviour probably has nothing to do with the firmware upgrade and may just be specific to trying to turn off the BMS while current is flowing in.

[@PavelBrand]

just watching now...how about after bulk finist set ~95 or 99% soc?would this solve the problem?would it be right soc? (first cell reaching 3.45 or your set 100% cell charge) edit:different things could be:bootloader and settings(something not changing/deprecated settings?clear and try again if it can be cleared/defaulted?)

[@OffGridGarageAustralia]

Reaching 3.45V is not 100%SOC. That was the problem the older software had.

[@PavelBrand]

@@OffGridGarageAustralia by that 100%cell charge i meant that trip point where you can't really do more bulk,this is some important point where you know your soc(i just guess now) could be 98% point and you could set that so your soc won't drift if you have to discharge..it is like calibration point if you know what i mean (upper knee,another known soc is in lower knee where opoosite happens,at least one cell voltage goes down more),would this help in firmware?

[@OffGridGarageAustralia]

@@PavelBrand The cell is charged 100% if it is on 3.65V constant voltage and the charge current has reduced to 0.05C of the cell capacity. Because we charge to 3.45V only, we can only speculate what SOC that might be. I did some testing back then and found that 3.45V and fully absorbing to ~0A is 99.8%. At this point I consider my battery to be on 100% SOC.

[@PavelBrand]

@@OffGridGarageAustralia ah,okay,thank you,i had just an idea,if(jk's long term problem of not knowing soc correctly) the bms is very off,it could get an idea where it is once reaching some defined point,while still not being at 100%,but i think it is not necessary IF they fix it in the first place...and also,thanks for the 3.45V point,since this is where i want to be,i have a bunch of old pylontech packs(5s2p) i'll be cutting(pcbs only off course),sice at least one cell pair in each pack is _very_ fat,so i'll be balancing and pairing them,and i'll be keeping them under 3.45v just to be sure..and i'm glad we have you to help jk make best bms ...and now on completely unrelated note,giving away a lot of pillows :)

[@joseo.cordero7286]

Does anyone know what is the JK BMS criteria to get out of float mode? If I set float timer to 11 hrs when the BMS enter float mode will it stay in float mode even if the battery start being used and gets partially depleted? Will it stay in float mode until the RFV gets depleted no matter what?

[@jonason321]

Just checked mine, on hardware version V15A, upgraded to V15.35 and dry contacts can be triggered and turned off and triggered again normally, though I don't use them for anything.

[@OffGridGarageAustralia]

Thanks for testing, where did you get your JKBMS from?

[@jonason321]

@@OffGridGarageAustralia JKBMS Store on aliexpress

[@2hotscottpro]

I think an operational bms shouldn’t need an update on a brick.Back doors is the new that needs to stop.

[@RichardSteigmann]

Hi Andy, I'm a mechanical engineer and I'm always in contact and in exchange with China in many respects. My motto after many years of experience in this area is: "If you have Chinese machines, you have Chinese problems." 🤣🤣🤣 There is often no logic in the errors. Things that have always worked no longer work in new versions. 🤕 Have fun and success.🤓🍀

[@NicklausJ]

Can someone explain what the difference is between V14 and V15? Both of them are the large versions? Or is the V14 the version that Andy has in his battery shelf?

[@WBurg]

V14 ---V15 are Hardware Versions

[@NicklausJ]

@WBurg thanks for your awnser, I know it's a difference in hardware but is the V14 the smaller version of the BMS? That Andy has build into his shelf

[@OffGridGarageAustralia]

No, no, both V14 and V15 are the bigger, longer inverter BMS. They are the PB series. The smaller, more square shaped ones, are BD series and they cannot be updated with new firmware. I'm not sure what the difference in hardware exactly is but at some stage JIKONG developed a new V15 BMS🤷‍♂️

[@NicklausJ]

Clear Andy, thanks for your time to provide me this awnser🎉