New JK-BMS with full charge algorithm and surprise functions we always wanted. Is THAT the one?

So, after testing like 5 different firmware for the inverter #jkbms , the new v14.13 is apparently the one which we have waited for. I've spent a long night in the garage to go through all the settings and parameters of the new software version. You can now set the absorption and float voltage as well as an absorption and float timer. With these settings, we can already set up a full logic which can perfectly charge your batteries. All settings can be adjusted to your needs and system design. It looks really good!
They also implemented 3 new 'surprise' features, we talked about for a while which are really useful.
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[@XonGrid]

Andy I'm glad your channel has stayed a real DIY channel. Thank You for the Great Content!!!!

[@OffGridGarageAustralia]

Thanks a lot. I'll try my best!

[@Raphael_Hofmann]

I think most of the BMS reset to 0% SOC...but only, if a cell hits the low voltage disconnect. Good work Andy, helping them to get on the right path. That will benefit the whole DIY-community! Finally the perfect BMS has arrived 🤗

[@OffGridGarageAustralia]

Yeah, it seems to be working well now. I'm still testing but so far... Well, video is coming soon.

[@repairman2be250]

Andy the Chief of Quality Assurance at the JK Factory. And a big compliment to JK for listening and implementing features.

[@OffGridGarageAustralia]

They kept sending me update after update and I declined them all! 😂

[@DanBurgaud]

20:45 I'd use those contacts to control Temperature: ie, Turn on battery ventilation fan when battery is >35⁰C instead of 50⁰C (Over Temperature).

[@OffGridGarageAustralia]

Yes, you can. It's such a great feature this BMS now has.

[@NickTandyWebDeveloper]

Brilliant work JK and Andy - thank you for persevering Andy, I bought one after the first review then my heart sank when the follow up came on. This has made me feel way better they've got your confidence back 👍🏻

[@OffGridGarageAustralia]

Yeah, I had the same feeling and heart-attack after I ordered quite a few of them and the promised software didn't work. Testing the BMS right now, video is coming very soon.

[@restfulplace3273]

Boss move in the intro. No words. Just intro music and a humble brag

[@OffGridGarageAustralia]

Thank you 😉

[@panosbalakGREECE]

Every night before sleep i stay with my kid enjoy your videos. and learn by you . Thanks

[@OffGridGarageAustralia]

Thanks so much and say hello to your kid!

[@OpenSolarEnergy]

Congratulations on the 75K Andy and thanks for the good news with the new JK BMS.

[@OffGridGarageAustralia]

Thank you very much. A good day to celebrate both.

[@edouart]

The 2 relays with conditions are really really great !!!

[@davidpenfold]

I guess it helps with cheaper inverters. The SMA SI inverters have two also.

[@OffGridGarageAustralia]

Yes, I was really surprised that they have implemented the relays in the settings now. What a great feature.

[@FutureSystem738]

Thanks Andy, as always, love ❤️ your work! Congrats on 75k!

[@OffGridGarageAustralia]

Thanks a lot Dave! Appreciate you are since the beginning.

[@edwardvanhazendonk]

Thanks for all your hard work explaining, testing and re testing of all features and for JK for creating software for a lot of your wishes 🎉. Great to see you reached 75k subscribers with great content and a nice channel to watch 🥂🎉🎊

[@OffGridGarageAustralia]

Thanks a lot, Edward. I appreciate all your support and comments over the years and all channels.

[@nathoilboy2053]

Well done Andy. I Joined just before 10k and watched it grow over a few years now. Built a few batteries for myself and friends using all of your fantastic information and passion. All I can say is bring on 100k. The best on You Tube!

[@OffGridGarageAustralia]

Thank so much! That is the main purpose of the channel to share information and inspires others to start their own projects.

[@thijsdejonge4493]

Thanks Andy! Very nice video. Cannot wait to test one of them in combination with an Multi RS or MultiPlus-II. Congratulations with your 75K!!

[@OffGridGarageAustralia]

Thank you. Got min hooked up to the Powerwall 2.0 and it seems to work great. Video is coming.

[@AxisSync]

Got a old style Bms recently and it has the SOC reset function as well 😊

[@OffGridGarageAustralia]

Yes, the recent ones have. Actually for a while now, I think... Nothing wrong with the 'old' JK. It's not old as such.

[@ElieHarfouche]

Thank you Andy and congratulations for the 75k subscribers. I can't wait to see the hands on results of the firmware update. From my part, i learned a lot from your videos and i return to your channel when i always seek help. This community is wonderful and i advice anyone coming to watch Andy's videos to subscribe. I wish the community forum is always active or at least you have a place in a forum somewhere to discuss further about the tests and results and videos that you release. Keep up the good work and Thank you.

[@OffGridGarageAustralia]

Thanks a lot Elie. Very kind comment and words. It is a great community here, really love reading all the comments and be part of this whole journey. I myself learn a lot from my tests and are more than happy to shar this with the world.

[@HybridShedIraq]

Conratualtions on the 75k subscribers ! good bms updates can you set different charge/discharge currents for several different sized batteries paralleled.

[@OffGridGarageAustralia]

Thank you my friend! We will find out in the next video when I will test parallel batteries with this BMS.

[@danfitzpatrick4112]

100k in sight! Cheers brother! 🍻I have always thought the JK was the best, but YOU have helped them to become even better! Awesome, and thank you!

[@OffGridGarageAustralia]

Thanks a lot Dan. It's a bit of a journey, eh?! And I have the feeling, we have just started...

[@lotsad1234]

With the relays im sold on this!! Need to start a generator on an offgrid system!

[@OffGridGarageAustralia]

Yes, can be easily done by SOC, cell or battery voltage.

[@christiangroever4729]

Congrats, 75k well deserved, you rock..and JK has once more shown what hey are capable of, even though under Andy-Pressure😂

[@OffGridGarageAustralia]

Thanks a lot Chris. Yeah, JK did it again. As with the NEEY, some pressure seems to move things. Even in China😄

[@ashikn200]

Finally you made it whatever we expected on JK, thanks. Let us get one and come back to you about our feed back 👏👏

[@OffGridGarageAustralia]

It seems to work well. Very well. I'm impressed. New video is coming very soon with the full test and review.

[@rodneyhrytsak3407]

Andy, a very useful feature (especially for us Northerners) would be functionality to throttle charge current based on temperature. Can you please pass this along to JiKong?

[@user-zy9ux9er4o]

Thank you very much, Andy, for the work you put in. You are a wonderful person and you make our lives more beautiful. Best of luck, and keep up the great work!

[@OffGridGarageAustralia]

Thank you very much!

[@user-zy9ux9er4o]

May God give you good health and a strong work ethic. I personally follow you with interest. All the best for Oscar's garages and for Neeeeeeeeeeeeeee.@@OffGridGarageAustralia

[@germo35]

75300 congratulations Andy! Thank you

[@OffGridGarageAustralia]

Thank you, can't believe it!

[@RichardSteigmann]

This looks very promising, I'm looking forward to the practical test 👍👍

[@OffGridGarageAustralia]

Coming up next!

[@Dutch_off_grid_homesteading]

Heya, congrat's on 75K that new jk bms looks promissing can't wait the see some more test's as I'm still looking for 3 bms's

[@OffGridGarageAustralia]

Thank you. Did you catch up on all videos now?

[@Dutch_off_grid_homesteading]

@@OffGridGarageAustralia Heya, not jet only 45 vlog's to go

[@vtecths]

Great show as always, Andy! Here's to 100k! 👊🏻

[@OffGridGarageAustralia]

Thank you, will be a while until then but it's a long term goal.

[@moestrei]

Pre-discharge could be a precharge function (usually done via a resistor) for inverters/motor controllers with a lot of capacitance at the DC input.

[@drdos6718]

I do my precharge of the inverter with a pair of 24V globes in series. This function would handy on the BMS though. Maybe on the next battery bank (Finance Dept. willing :) ).

[@OffGridGarageAustralia]

Yes, correct. The JK is intelligent enough to distinguish between a short and capacitor connection and will pre-charge the inverter before connecting it. No manual pre-charge necessary any more. I think Seplos and Pace have the same feature.

[@Carsten-PV-DIY]

@@OffGridGarageAustralia happy days. Especially if you have a three Phase setup of the victron mp2. I almost git a heart Attacke when i saw short circuit protection Switched on for the first connection. Then i understood the Pre charge Methode with light bulbs or resistors. 😉☺😎

[@upnorthandpersonal]

Congrats on the 75k! New JK is starting to look good; too bad I don't really have a use for it. I'm about to order two of the old 100A JK versions for a planned 30kWh addition though :)

[@jws3925]

always good to see comment upnorth!

[@OpenSolarEnergy]

FYI, I bought 2x JK B2A20S20P in July and they also have 0% and 100% function.

[@gg-gn3re]

@@OpenSolarEnergy nice. I just got one a week ago (should arrive in a week or so) I'll report back on that

[@OffGridGarageAustralia]

The 'old' JK is not really old, right? It is the same great BMS with active balancer.

[@upnorthandpersonal]

@@OffGridGarageAustralia No, not old at all and under active development. The best BMS in this price range.

[@jo8ephthomas]

Taken the plunge. As I have 2 new cases for my cells. The old 2 will go on the 2 older banks I have with mount jkbms. Love this channel best on KZbin without a doubt

[@OffGridGarageAustralia]

Thanks so much for your kind comment! Testing it right now, looking good, all seems to work well.

[@Carsten-PV-DIY]

Great Test, congrats for your subscribers and thanks for your efforts to build and improve the perfect enduser bms! Perfect Timing for me to take the decision for the second battery pack 280eve lfp. 🎉👏🙏🍺🍻

[@OffGridGarageAustralia]

Thank you very much!

[@etamminga]

Wow! 75k :) 🎉 And JK is looking better!

[@OffGridGarageAustralia]

Thank you. Yeah, a great combination and reward.

[@hendersonsobers396]

I'm really happy for you Andy....75K subs is quite an achievement. I can easily see you blowing past 100K subs next year. The quality work you do keeps us coming back and keeps new subs coming to the channel. You do so much for the community and we all appreciate you very much. I'm really happy to see that JK has been putting in the effort to make their new BMS feature competitive and correcting its many wrongs. I hope that this entire experience has been a valuable lesson for JK....don't release a product until it is ready. They've lost some credibility by releasing this product too early, and even more credibility lost by advertising support for over 40 inverters when they support way less. Never a good idea to get into the practice of false advertising. It's very difficult to develop and keep a good reputation and very easy to develop and keep a bad one. So please JK, let this be the last time you pull a stunt like this. Having said all of that JK, you still have a loyal following of customers who are rooting for your success, so keep pushing, keep innovating.

[@OffGridGarageAustralia]

Thank you, great comment!

[@the_schmue2973]

Congrats Andy. Gutes Thema für ein 75k Special. Und großartig das es mit dem Livestream klappt. Wird ja sicher ne Nachtschicht

[@OffGridGarageAustralia]

Frueh morgens bei uns. Muss ich Sontag um 4 Uhr raus🥱

[@the_schmue2973]

@@OffGridGarageAustraliaIch hab 2 kleine Kinder. Das ist also genau die Zeit die man als Erwachsener für sich hat. Aber Danke für den Einsatz.

[@luisarmandoscatolonmenotti9905]

Straight from sunny Brazil, congratulations.

[@OffGridGarageAustralia]

Thanks a lot. Appreciate you are watching from Brazil!

[@pcMuneer]

Congratulations Andy for your 75k achievement ❤

[@OffGridGarageAustralia]

Thank you! 😃

[@adon8672]

I think a tail current is still of critical importance. The caveat should be that it should be used in conjunction with the desired voltage. For example if full Charge voltage Is set to 56.64V and the tail current is reached at that voltage, the BMS should consider the battery to be 100% charged. If the prevailing current is equal to the tail current but the voltage is below the set voltage of 56.64V the BMS should consider the battery to be below 100% charge. Charging should be allowed to continue until both the tail current and the desired voltage are reached.

[@MMMM2MMMM2MMMM]

What will this do when the battery is older and the capacity dropped to 80%. People who have bought battery's might not buy/build another anymore. Just curious what a tail current is.

[@garymeissner6659]

I have to agree with Andy on this one. If you are charging at a fixed current, then "tail current" works very well. But in our PV Solar setups, the charge current is typically much lower than the C rate of the cells, and it varies all over the place. Once the voltage does finally reach the absorb voltage, the charge controller should just try to keep it there. But as the sun goes down and clouds go by, the current can still dip off, but then come right back, even if the absorb voltage has ben reached. We should still hold the voltage at the bulk absorb voltage for the desired time, even if the current falls lower from time to time. On the flip side, when I use my mains charger to charge up my e-bike batteries at the 1C rate, the tail current is a very good indication that it has reached full charge. My solar battery bank only charges at 0.2C which is not much over the typical tail current for the cells. Different use case will change which works better.

[@OffGridGarageAustralia]

It's one of these discussion... Tail current seems to work for some but not for others. There is more to it...

[@adon8672]

@@OffGridGarageAustralia interesting Andy. Hopefully you'll clarify this more in your next video.

[@tiborchren]

JK (or other BMS manufacturers) should integrate all the excellent features from the Peter boards into the JK Inverter BMS like solar charging communication with WiFi and Home assistant plug and play connectivity.

[@OffGridGarageAustralia]

They should, but won't as long as sales numbers are high. This is all new stuff we see here and it will take a while until other will implement this as well. A Seplos BMS v4?🤷‍♂️

[@twinsy33]

The advantages I can see with the new JK-BMS versus the older (but still very good) one is the current limiter on board + the dry contacts

[@OffGridGarageAustralia]

Yes, definitely additional features we have with the new one. But no reason to upgrade form the old JK, I would say.

[@StefanEnglert-ud1pq]

Hi Andy, great job😊. Neither the iOS app (there is no new version), nor the new PC software (2.4.0) show the new parameters … I can trigger CVL with the old Battery UVP parameter, but there is no switch for turning on float mode.

[@OffGridGarageAustralia]

Thanks, Stefan. They are still working on the new iOS and PC version. At this early stage, only the Android app works.

[@centerrightproudamerican5727]

Andy: Ask them to implement a function to stop accumulation if the cell delta falls under the configured delta for starting charging. (Once the cells are balanced there is not much need to continue accumulation)

[@jcs1492]

Wow...JK is sofar ahead of Seplos, Thanks Andy

[@ChipMIK]

3*280Ah in parallel at cell level with busbars * 16S, DALY BMS with NEEY 4A 4th gen balancer, DEYE 12 KW 3 phase inverter connected to "Home Assistant" through Modbus: Charge voltage set to 56.0V @ 11:00 every day. When Voltage >55.7V and Delta Voltage from balancer has been below 2 mV for 3 minutes set Float, Absorption & Equal Voltage to 54,3 V. Works perfect year round in Scandinavia. Would have loved the JK-BMS but i charge/discharge up to 220A (Inverter rated for 240 A charge/discharge) and JK just seemed to flawed for this when ordering components 15 months ago so great input if i one day should get bored and redo my setup :-)

[@OffGridGarageAustralia]

Thanks for sharing.

[@TheRonskiman]

I will be sticking with my compact JK BMS, my battery rack is quite compact and I doubt the bigger one will fit. I'm not going with the Peter board either, I have no real need, it would just be a nice to have, but it's too expensive. Congrats on reaching 72.3k subscribers, it's gone up 100 overnight.

[@OffGridGarageAustralia]

Thank you. The 'old' JK is perfectly fine as it is, no need to upgrade in any direction if you won't use the new features.

[@HalilKacmaz-dq1bc]

really appreciated, this is as exciting as the GTA6 trailer release to me. putting an order now, which I have been waiting for this video.

[@OffGridGarageAustralia]

Thank you, great BMS now with this new firmware.

[@uhjyuff2095]

the "SOC - 100%" setting should set the display to 100 percent only if the lowest voltage battery cell reaches it not any cell reaches it, imo.

[@KrzysztofCygan]

Or maybe it should be average cell voltage. Or maybe there should be another option there to specify which option we want.

[@guywhoknows]

I hate the 1 cell is at 100%.. In practice, the battery may meet 100% and continue to balance, which can/should drop the soc... So you get charged then 98% soc.. While the BMS is near done, the issue now comes from the inverters to listen😢

[@moestrei]

No: 1) You want to stop charging when the highest cell is full. You don't want to overcharge a cell. b) your pack should be always top balanced anyway.

[@uhjyuff2095]

@@moestrei a lithium battery pack consists of many individual cells. And the bms monitors all the cells individually so imo, the bms could tell me if one or all cells have actually reached 100 percent charge.

[@moestrei]

@@uhjyuff2095 Yes and when the 1st cell is fully charged you better stop charging and call it 100%. You absolutely do not want to overcharge a Lithium cell.

[@upper_deck]

Gratuliere zu 75K !

[@OffGridGarageAustralia]

Danke Dir!

[@olafschermann1592]

Gratuliere zu 75k !

[@OffGridGarageAustralia]

Danke Dir, Olaf!

[@wayne8113]

Thanks Andy 😃👍

[@OffGridGarageAustralia]

Thank you, Wayne!

[@paulcurtis5496]

I thought Batrium went under, but @AverageJoe says they’re still going! I love their interface, love it! I wish you would love it too!

[@OffGridGarageAustralia]

It's too expensive. Most have already complaint about the Peter board being too expensive. Imaging a BMS which cost over $1000

[@paulcurtis5496]

@@OffGridGarageAustralia 😱 is it really that expensive???

[@OffGridGarageAustralia]

@@paulcurtis5496Yes, plus all the accessories, like shunt and contactors.

[@paulcurtis5496]

@@OffGridGarageAustralia

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

75,000 WOW ANDY THAT IS MEGGA!!!! Well done mate you genuinely deserve more than that! I Joined you at like 1500 😂 Love the Gary From the Scotland

[@OffGridGarageAustralia]

Gaza from Scotland, thank you for being with me for so long. Really appreciate it!

[@garymeissner6659]

The wire resistance is a bit more important in the JK BMS. Since the balancer can pull or push 2 amps to any cell, that resistance is used to correct the cell voltage reading. My JK-BMS calculated from 0.131 to 0.142 ohms for each lead. At 2 amps, 0.142 ohms will have a voltage drop of 0.284 volts when the balancer is operating. If it is trying to measure the cell voltage while the balancer is operating, it knows to calculate this voltage offset to add or subtract it from the measured voltage at the balance wires. If a cell is being discharged, it needs to add this offset back. And while the balancer is charging a cell at 2 amps, it would then need to subtract this raised voltage from the cell measurement. When you change the pack parameters, it appears to measure the resistance all by itself. It pulls and pushes balance current from each cell and measures how much the voltage changes and then calculates and stores that as the resistance value. In reality, this resistance is 2 complete wires for each cell. Cell one is the resistance of the zero wire on the negative main terminal AND the 1+ wire from between cells 1 and 2. Any voltage drop on both wires all will add or subtract from the cell voltage reading of cell 1. Cell 2 also uses the 1+ wire, but then has to add the 2+ wire to that. My wire 2+ is the pin that failed in my JK-BMS. When that lead failed, it showed both cell 2 and cell 3 as zero volts. On BMS units that only pull 0.06 amps for balancing, this is not a big deal. But at 2 amps, it certainly is.

[@OffGridGarageAustralia]

The BMS does not measure the voltage during balancing. It waits for a few second after balancing to have the cell voltage stabilised before measuring and making a decision again.

[@Mr.TonTop]

Well deserved Andy! 🐸🐸🐸🐸🐸 Keep up the good work.

[@OffGridGarageAustralia]

Thanks a lot!

[@InspectorGadget2014]

Nicely done by JK & your corporation, impressive. Too bad my systems are only 12volt (for transportability purposes) but otherwise I would consider them...

[@OffGridGarageAustralia]

Thank you! If you use the old JK, it will work very well with your 12V setup. There is nothing wrong with it.

[@Carsten-PV-DIY]

@@OffGridGarageAustralia Andy, it is not old. ☺😉🤣🤣🤣👏👏👏👏👏For my seriell initialisation i still use the 4-8s four block 12v jk Version with 1a balancing function. Perfect working and time saver!

[@JPHER217]

Hello Andy greetings from cold and snowy Sweden🎅

[@OffGridGarageAustralia]

Hello to Sweden. Thanks for tuning in.

[@vongolo1]

Congratulazioni!

[@OffGridGarageAustralia]

Thank you!

[@nicolaskahn3996]

Bonjour, merci pour ces informations sur ce nouveau programme, en ce qui me concerne j'y vois comme seul avantage la partie communication, on se rapproche de plus en plus à du paramétrage d'onduleur avec différents protocoles et ce que j'espère c'est qu'ils vont pouvoir communiquer en série, ce serait une belle performance d'avoir 2 bms jk vu comme un seul par victron venus sur un cerbo.

[@edouart]

J'espère que sa prochaine vidéo ( ce soir ? 😇) répondra à ces questions.

[@martdaymo]

Discharge pre-charge timer could be the time it takes the pre-charge resistor to precharge the inverter capacitors. This is a problem I have with my seplos BMS, it doesn't give enough time to pre-charge the SMA Sunny Island. So the BMS goes into overcurrent protection on start up.

[@OffGridGarageAustralia]

Yes, correct. There is a bit of 'smart' built into the new JK where it can distinguish between a real short and a capacitor connected and act accordingly. I'll cover this in a future video.

[@Chassar1990]

Congratulations on the 75k 🎉 Why oh why only 16s on the new inverter bms 😢

[@OffGridGarageAustralia]

Thank you. That's what most people use and is common in pre-build batteries.

[@CantFindInYoutube]

Congrats for the 75.2K

[@OffGridGarageAustralia]

Thank you!

[@mariog5569]

I think a tail current makes absolute sense in combination with the voltage like the smartshunt does. If ther is a cloud then not only the current but also the voltage drops but this value is also a requirement for 100%. A time doesnt know anything: if the voltage is reached in a sun peak, it's likely that a few percent are missing.

[@user-gg5ww2kg6u]

The entire video would be enriched with information about the used (BQ) control main chip, which series and designation it is, because that is the only way to see a step forward. If the hardware is compared, it means that the component used will also be shown, which will accompany the information about the possible settings. Sincere thanks for the nice presentation. 🌞🌞🌞🌞🌞

[@OffGridGarageAustralia]

Not sure what that means, but thank you.

[@1Abofalle]

Hi Andy! Congrats and thanks for your diligent and passionate work. Unfortunately the software still seems buggy. In found 2 more issues: (1) Upon restart all settings are lost and (2) with my Deye inverter there is no discharging of the battery (charging works though). Maybe others can confirm my observations. Greetings to all!

[@davidpenfold]

That is pretty groovy 🎉

[@OffGridGarageAustralia]

Getting there, eh?!

[@sspyder181]

Congratulations 🎊 👏 Earned 👊

[@OffGridGarageAustralia]

Thanks a lot!

[@edouart]

Thank Youu 🙏

[@odhomeautomation3288]

Best wishes to your 75K followers I'm very happy. JK claims that this BMS can be managed remotely with a dedicated Cloud. Have you tried this very interesting feature?

[@OffGridGarageAustralia]

Thank you. Haven't heard about this feature yet. How would the BMS connect to the internet? It has only BT, no Wifi. I think the CAN-CAN Peter board will exactly do that.

[@tuju-]

Sweet that they have moved to decimal time already!

[@launacorp]

Tail Current is used, when the battery is @Vmax. So if the Battery is at max voltage u set an the tail current is at this point lower then the settings, the battery will set to 100%. If there is not enough sun and the (max possible) tail current can´t be reached the battery won´t be set to 100% ´couse of the voltage drop in the higher knee of the charging curve.

[@majowanie]

Hello! I'm glad I came across your videos! I have a JK B2A8S20P and I would like to upload new software. What device do I need for this? the information at auctions is not quite clear. Thank you very much for your help!

[@danielardelian2]

I would set the re-bulk timer to 7 days (168 hours). No kidding. Can you even enter 168 H into that field? Use the "Absorption" voltage just for balancing the cells once per week. Keep them at "Float" voltage for most of the time. ---------- Victron has a 2-signal BMS Assistant with two signals "allow-to-charge" and "allow-to-discharge" that is supposed to be more "gentle" on the electronics rather than the BMS brutally disconnecting the battery in case of cell OVP / UVP. I wonder if the two relay contacts DRY1 and DRY2 could be used as 2-signal BMS for Victron, as a first line of protection. Then use the BMS OVP / UVP protection as the second protection level.

[@drdos6718]

I have re-bulk (not timed) set to slightly (0.9V) below Float. That way if it's been cloudy for while during the day, and the battery has dropped, it possibly can top up a bit before sundown.

[@OffGridGarageAustralia]

That's a good idea of a long term Float. I'll see what the maximum time is we can enter for this timer. I can ask JK to change the max time in a future FW update. Should be no problem. I wouldn't be too concerned about the BMS shutting down in a protection situation. We still have the MPPTs delivering power to the Multiplus during the day, so no real shutdown. UVP is very rare as the MP will shut down before that or take power from the grid instead of the battery. How often does it occur? And if it happens, you need to find and fix the cause anyway. It's a bit like a circuit breaker, it's there but should never trip.

[@sebastienl2140]

Thanks for this review. I like this new CANbus implementation, it's will be more easyier to play with esp. What is the precharge function? Is it like big relay bms but with mosfet bms? Ps don't lose your time with Esp32 closed source firmware

[@OffGridGarageAustralia]

Thank you. The pre-charge function of for connecting inverters. The BMS limits the in-rush current until the capacitors have charged up enough to avoid damage the BMS and inverter itself.

[@greenbimoon]

Awesome That 0% SOC setting should mean that the remaining % is actually now fairly realistic to what your useful capacity % is. Nice! Yeah Andy, that set up list needs to be logical, Cell OVP & OVPR obviously together.

[@OffGridGarageAustralia]

Depends how you define 0%. At 3.0V already or at real 2.5V? With this new feature, you can do how you like...

[@sharetheadventure1]

Congrats on the 75k Andy ! But Now i'm in 2 frames of mind in which way to go with my 2.0 setup ? I have 4 banks of 304 QSO cells. that i need the Multiplus 2 control. on a ess setup. I would be interested in your thoughts on that now. 🤔🤔😊

[@OffGridGarageAustralia]

Thank you. What BMS do you have right now? If you haven't got any, the new JK would be my recommendation. There is also a discount code on my website...

[@sharetheadventure1]

Running 2x B2A8S20P running Singley .and using the Victron shunt for measuring in and out amps and volts @@OffGridGarageAustralia

[@jk.ess.solution]

congratulations.🎉🎉🎉

[@OffGridGarageAustralia]

Thank you very much. We have achieved a lot together! Looking forward to a bright future and more collaboration.

[@mohamadmohanad315]

thanks i have many projects connect old bms jk connect parallel more than 20 projects..until now not have any problems so we can connect old bms jk

[@OffGridGarageAustralia]

Yes, you can connect the old JK-BMS in parallel, no problem. It just does not have communication, but nothing wrong with it...

[@GregOnSummit]

6:40 ... Yes grouping is best, especially from an accessibility perspective. It would be nice if the settings for the precision is the same for all values too. Makes it easier to read. SOC to 100% .. what if you have one cell that is higher then the others and hit's this limit before the balancer can bring it down? Is it instantaneous, or is there a delay? On the zero volt state of charge ... is this linear, so it doesn't show 10% then suddenly 0%? The naming of some of the parameters is confusing. Would be nice to have an icon for a bigger description ... RCV is float voltage? Dry trigger ... turn on fans . That's great 👍 23:00 ... On the ability to turn float off and on, is there an API that you can call to run a job to automate this? Cutting edge is cool, but I'll wait for now👍 As always awesome stuff !

[@OffGridGarageAustralia]

Thanks for your feedback. The 100%SOC is not perfect. If on cell triggers it, it will not interrupt the absorption and balance time. It just sets SOC to 100% and remaining capacity the same as battery capacity. Voltage is not linear with LiFePO4 but SOC will not jump as the BMS uses coulomb count to count down SOC. SOC0% and SOC100% just shows the BMS where the boundaries are. No API, except the BT connection you can potentially tap in. Not sure if this is possible.

[@francoisemaille4129]

Hello Andy And thanks for your vidéos ! Does JK BMS has the same for 4S batteries ? With charging management ?

[@shanesummerhayes7101]

Hi Andy. Myself I would like the re-bulk to be triggered by cell voltage, rather than a timer. It would seem that by timer the battery could be topped up many times during the day even if no significant load has drawn any Ah out of the battery. Needless charge cycles on the battery? By using re-bulk by cell voltage, a small load would not trigger a re-bulk, but a larger load that draws the cell voltages down enough would usefully refresh the battery. Im fully off grid and the Victron mppt's do this perfectly. The Victron inverter chargers not so much given you cant select the actual re-bulk voltage. A note about the buzzer warning and dry contact relay use would be that it looks like you can only select 1 parameter option?? Maybe a tick box for each parameter that you would like to select.

[@OffGridGarageAustralia]

The idea of the timer is to NOT have it topped up again the same day (timer runs out at night). With LiFePO4 it makes little sense to top up again. There is no real difference in capacity gain to go from float back to bulk voltage. Less than 0.5% usually. So a repeated top up during the day has almost no effect and only stresses the battery. You have two relays which can be programmed individually. I think it's a great feature.

[@chrisgroothoff2611]

Andy, I am pleased that you are going to look at what happens between BMS's that are used in a parallel configuration. This is important for several reasons. 1 - what happens with the settings, is one a master the others become slaves - controlled by the dip switches unless you have a Seplos V3 2 - what happens if you already have one battery that has been in service and you add a new battery and the new batter has new firmware. In this case, which one would you make the master 3 - in a real world scenario, what is the best practice when adding a new battery to you battery back.

[@OffGridGarageAustralia]

Thank you. 1) We will look into this in all details in the next videos. 2) that does not matter. You can happily mix old and new batteries in parallel as long as they have the same chemistry, voltage, cell count and each has its own BMS 3) just connect it. I have shown this many times here on the channel. You can mix and match, no problem. Watch here: kzbin.info/www/bejne/mJmmhJaZg9iEhdk

[@haydenwatson7987]

Nice review. Will they be updating the app for the old, non-inverter bms's with the new parameters?

[@OffGridGarageAustralia]

Not possible unfortunately. The chip, they used previously cannot be updated easily (if at all).

[@rockyfox7087]

Hello Andy, It seems promising but we have couple of things that needs to be tested For example what if while in bulk charge mode we didnt have sun energy as it should for one hour, in that case it will turn to float mode without actually giving the batteries enough time to absorb, and if we increase the time then we are putting the cells under pressure of absorption more than it should

[@OffGridGarageAustralia]

Well, if you haven't got enough sun to stay at the absorption voltage, there is nothing you can to regardless what settings, functions or features you have. The voltage will go down in any way. if you hit absorption voltage, you will be at 99% anyway, so... 🤷‍♂️ Outcome: there will be no absorption for that day. No drama, it will do it again the next day or in 5 months after winter...

[@bickhofe]

Danke!

[@OffGridGarageAustralia]

Thank you. 3rd place 🥉

[@typxxilps]

17:44 - What does the setting 003 mean above Victron, the GROWATT BMS cause GROWATT has usually different can bus protocols for off grid and for example the SPH series where this entry could mean GROWATT BMS can-bus-protocol-low and then I guess "low voltage" which would mean the Growatt SPH series up to the SPH6000 which are growatts biggest low voltage Hybrid inverters (all single phase hybrid inverters). In that case I could replace my seplos in the SEPLOS MASON L battery with a JK BMS without loosing the growatt app support cause I have 6 growatt inverters and 30 kW .

[@OffGridGarageAustralia]

#3 and #4 are showing when the BMS has disabled charge and/or discharge. So, when the actual MOSFETs are turned off.

[@kurayamix]

for my case. I control charging stage by home assistance with automation. May be you should do the same. because you can program it what ever you want and doesnt need jk bms to do it for you. 😊

[@edouart]

Interesting.

[@OffGridGarageAustralia]

I would not do that. HA is not save enough for such a safety related control mechanism.

[@kurayamix]

@@OffGridGarageAustralia thanks for your reply. Your bms setting helps me alots. Yeah it does not fully control jk BMS. All safety features still active on bms. Etc. balance and Over/Under voltage safety. I'm just controlling voltage from inverter to charge on each state. I'm increasing the charge voltage step by step by looking at the charging current (amp). If it reduce to near 0. I'll stepup to the next state. now totally 3 states. 3.35 x 16 / 3.45 x 16 / 3.55 x 16 form my test if I increase voltage little by little it will be more easy to balance. Not sure if these make sense tho but it work for me.

[@clint965]

i think the precharge time is for charging inverters with big capacitors. does the bms have a large ceramic resistor onboard? then it is for that to prevent sparks. seplos has this too. coud you test this on the new jk bms?

[@OffGridGarageAustralia]

Yes, that is correct. It will auto pre-charge the caps of an inverter without in-rush current. Seplos and also Pace have this feature.

[@cpirius]

This looks great 🙂 Any idea if they will migrate these firmware updates to the "old" jk bms models that include CAN bus hardware? Seems like almost all the features would work. Just need the right cable.

[@4GoChris]

No. The old jk bms firmware update is not possible😢 (Possible, just not for us. Need the new firmware, need a chip programmer -for STM32-, and -i think- need a soldering tools-hot air -and soldering skills -if the board has no programming port.. …but, Jk has never released/ never seen/ a firmware for old bms🙁

[@cpirius]

@@4GoChris oh I see 🙁 bummer. Thanks for the info

[@OpenSolarEnergy]

The latest (old) JK BMS have 0% and 100% function only.

[@MrJanulis]

@@4GoChris- it is a shame that JK do not provide FW upgrade and “Peter’s” solution with ESP32 is unreasonably crazy expensive ;(.

[@OffGridGarageAustralia]

Why don't you build your own Peter, if you can get the parts cheaper?

[@patrickruiz6764]

Hello Andy thank you for this explanation but I have a doubt about the functionality of everything because I have 2 bms in // and it is a problem because when I programs a charge at night at the same hours I find myself to have Alrmes of all !!! of tension elevate temperature !! All of that !! So I have noted you to see these BMS in // see you soon! 😂

[@martinkunz9768]

Nice - very nice. Android apk 4.17 is out.

[@OffGridGarageAustralia]

Yes, that is the one I have as well..

[@DroneManMurphy]

2:45 I wonder if the pre-discharge function would be similar to what I have on my Drone batteries where it will discharge automatically slowly overtime if the battery is not used?

[@OffGridGarageAustralia]

The pre-charge function in the BMS prevents very high in-rush currents when an inverter is been connected. It is a current limiter to protect the BMS and the inverter electronics.

[@DroneManMurphy]

@@OffGridGarageAustralia Oh yes, that makes sense. 👍

[@jo8ephthomas]

Also just putting it out there. Is this something the old jkbms could do with a software update?? I’m guessing it doesn’t have a coil for charge limiting but could it not tell the inverter what to do with a simple software update 🤷🏻‍♂️

[@OffGridGarageAustralia]

I'm sure the older BMS cannot be upgraded via firmware unfortunately.

[@jonasstahl9826]

Would be interesting to check, what happends when the inverter pulls power from the battery during absorbtion time, does it pause or stop and restart or get stuck.

[@OffGridGarageAustralia]

Test and result will be in the next video. I was curious myself 😉

[@tiborchren]

It would be very useful to arrange the setting parameters sequentially - in groups - so that all related parameters, not only voltage but also time or delay, should be in a sequence - next to each other as far as they are related to the specific group. Then it would not be necessary to scroll up and down so much. For even more clarity, it would be good to separate each specific group of settings with a horizontal line. The logical sequence should be according to these settings groups, not according to individual settings. Edit: Or it would be best to give the possibility of user-defined parameter sequence - if the user could simply move up and down the setting paramatres to set their custom parameter sequence, or even define their groups - move the separating horizontal lines as well.

[@OffGridGarageAustralia]

I'll pas this on to JK... Thank you.

[@tomaszszczepaniak2101]

it has got other side of problem , if u set uvpr to 3.6 and try change uvp to 3.55 example, it wont allow you , so sometimes order by voltage make sens , you can easy see the connections beetwen parameters example you cant set RCV request charge voltage equal to start balance voltage what is little wierd for me but just set start balance 3.44 and rcv 3.45 and im ok with it

[@universeisundernoobligatio3283]

Is there a way to calibrate each cell indicated voltage to a reference volt meter? Since the BMS indicated voltage reads to 1mV, it would be good to know if it's close to that accurecy. Note meter should also have its calibration checked first.

[@OffGridGarageAustralia]

I don't think it needs to be that precise.

[@JP-dy9po]

You rocks !!

[@OffGridGarageAustralia]

Thank you, but I would be nothing with all of you guys!

[@rcinfla9017]

An inexperienced person is going to have problems. For example, if you set your balance start trigger to 3.45v and short maximum absorb period you may end up with little balancing time. Not sure if I like Columb counter reset based on a single cell hitting trigger voltage. If you keep cells well balanced this will work but maybe there should also be an added condition for Columb counter 100% full reset requiring lowest cell voltage to be above 3.40 vdc. The amount of charge current effects these results as a greater charger current will have a higher overpotential voltage bump up on a cell. 3.45v with larger charge current will not be a fully charged cell. I prefer to set my own battery capacity number and not have the BMS modify my entered number based on cumulative AH's on Columb counter when low voltage trip occurs. Again, a momentary high inverter discharge current may prematurely trip a low cell voltage limit which would modify the battery AH capacity setting on its own.

[@OffGridGarageAustralia]

Maybe we should trigger 100%SOC when we enter Float mode. So, after absorption voltage and absorption time? If you set your own numbers, how do you calibrate the BMS calculated SOC to real SOC?

[@carljohncoronel3754]

the dry contact can put the active balancer? to auto matically on and off?😊

[@BrazzaB1]

Could the discharge precharge timer be for a precharge resistor?

[@OffGridGarageAustralia]

Yes, it is an automated function where the BMS recognises a capacitive load (not a short!) and charges the caps slowly before fully connecting an inverter for example.

[@faded.0913]

8:13. Ant bms has has this functionality for several years. I have the old version of the ant bms and I can set soc voltage % in 10% increments from 0-100%

[@OffGridGarageAustralia]

Afaik, this is only to get the BMS started if it hasn't been reset and calibrated correctly. JBD and QUCC have this feature as well.

[@dlya_svoih]

What about something like rebulk SOC? Only ours seems to be not enough. To start bulk in the morning independent of timer settings.

[@OffGridGarageAustralia]

Seplos BMS has something like this called Intermittent Charging where the battery fully charges and then turns off charge MOSFETs, wait for the battery to drop to a certain SOC% and recharges to 100% again. I don't like it. What's the purpose of charging the battery again to 100% and not keeping it at 99.5% at a lower voltage (float)?

[@paulcurtis5496]

Like# 65 - Can you trigger the sun coming up early? That would be handy! I’m off-grid off-grid, no electricity out here at all. I’ve only had to run the generator twice in two years when the Growatt didn’t connect the solar array 🤬

[@OffGridGarageAustralia]

You can have some of our sun. It produces much more energy than we can use down here.