Testing limits of JK Inverter BMS with SunSynk (Deye) Inverter

[@kennyrodg]

Thanks again Grant....You're doing a fantastic service for all Sunsynk users with DIY batteries...Top man !

[@GrantBurton]

Thanks very much, will try do a couple more of these videos between the other content on the channel.

[@xpressivemusic4578]

where do you source your cells in South africa?

[@panospapadimitriou3498]

best test ever .. right nowdays my test reached similar questions with the older jk and my battery is so small... only 90amp 48v setup.. always full .. or at least 90% safely full . which comes extremely fast even with 6 panels 240 watts if no loads... i was planning to setup my new inverter bms for that extra 10 amp barier feature and those relays to operate my fans to the server box ~~~ KEEP up

[@GrantBurton]

Thanks very much. If you are connecting communication between your inverter and BMS, then the max continued charge current set in the BMS should be reported to the Inverter, and the Inverter should be able to properly manage charge current up to that limit. I think the 10A current limiter function is more applicable (or one of its use cases) is If you are connecting batteries in parallel and not using any communication between batteries and Inverter. If that is the case, then you would have to set the max charge current on the Inverter manually, and if you want fast charge, set the charge current high enough to charge both batteries in parallel. The problem comes in if one of the batteries (BMS) disconnects, then the full Inverter charge current will be going into the other battery. That will quickly exceed the BMS charge current limit, and I think this is where the 10A current limiter will kick in. Let us know how it all works out once you have done the upgrade.

[@USA-GreedyMenOfNoIntegrity]

My two Sol-Arks have been running great, controlling limits fine without comms for over two years completely off grid with 170kWh diy LFP, mostly earlier model JK BMS’s, 32kWp, 10kW LP Gen for backup.

[@GrantBurton]

Thanks for letting us know… I’m sure there are still many people running the older JK BMS without any issues. I also ran two of the older 150A JK BMS’s for a year without any comms and they also ran perfectly well, but decided to give the JK Inverter BMS a try.

[@USA-GreedyMenOfNoIntegrity]

@@GrantBurton I have two battery boxes, new jk BMS and 32 314aH cells coming from Jenny Wu from Docan Tech.

[@GrantBurton]

@@USA-GreedyMenOfNoIntegrity Awesome, let us know once everything arrives and what you think of it.

[@ipstacks11]

@@USA-GreedyMenOfNoIntegrityHow much is something like that setup? I hope you don’t mind me asking.

[@USA-GreedyMenOfNoIntegrity]

@@ipstacks11 Like a brand new 3/4 ton 4wd quad cab truck without the taxes, maintenance, repairs and no electric bill.

[@calvincoetzee7036]

Awesome work

[@GrantBurton]

Hi Calvin, thanks very much.

[@captainobvious9188]

I’ve been using a Deye 8k with the first balancing JK BMSs and a battery made from three first generation leaf battery packs since 2020. I’ve just used voltage mode on the Deye while setting the AH the same as discovered on the JK-BMS after doing a full charge cycle, and it has been really accurate on matching the SoC itself. I want to try battery communication emulation with solar-assistant.

[@leonardfernandez882]

Hi Grant, Thanks for the insight and detail explanation of the Charge and discharge settings. I have a 16kw Sunsynk inverter working with 2 x 280Ah battery banks each using each New 200A JK inverter BMS. Both Batteries discharge together and are mostly the same Percentage SOC from fully charged until the solar starting kicking in the next morning. Then I find they do not charge together. My slave battery seems to charge at 43A while the master is charging at say 28A and the SOC will start rapidly picking up on the slave battery until it reaches 100% and after about 20 minutes the current will reduce and the master batter will then increase to say 40 or 50 A. I find it quite strange that they discharge equally but do not charge equally. The battery banks are exactly the same and have the same BMS settings. I also made the power cables the same length. The master battery connects to the inverter CAN pirt and i have a LAN cable between the two batteries I see the Sunsynk inverter reports the SOC as that of the Master battery which is always lower than the slave if in the recharging process. I do notice the calibration voltage seems to change from time to time and I make a point of changing the one battery to be the same as the other . i.e. 53.25V vs 53.22V. Do you have any idea why the batteries would discharge equally and not recharge equally?

[@GrantBurton]

Hi Leonard, it's a pleasure. You mention the SOC reported to the Inverter is that of the Master BMS only (and not an average of the SOC of both of you batteries)... this leads me to believe you are running an earlier version of the BMS firmware. What version firmware are you using? I think v15.11 was like this but later versions corrected this. I'm currently running and testing v15.27. Also, what CAN protocol do you have selected in the Master BMS... Deye or Pylon?

[@KarlBotha]

Awesome!!!!

[@GrantBurton]

Thanks you.

[@Mylifelovingit]

Very interesting

[@GrantBurton]

Yeah, it's been interesting to see how this BMS works with the SunSynk inverter... so far, it seems to be doing ok, especially with some of the latest firmware updates. Still a couple bugs that need to be fixed but hopefully JK will get to fixing these in the near future.

[@DipanjanDas23]

Hi Grant thanks for bringing us this video can you please tell me the BMS software version you are using while making this video ?

[@GrantBurton]

Hi, thanks very much. I showed the BMS firmware version at 13:10 in the video. It's V15.11

[@kennyrodg]

Hi Grant. It's taken me a while but i finally got my battery built a couple of days ago. Had multiple issues with terminals shearing off my batteries but that's a conversation for another day. It's seems to be working well apart from one issue. So, 280ah cells with a JK 200a inverter bms running 15-11 (thanks for all the tips on how to do the firmware upgrade btw ) It's talking to the Sunsynk Ecco inverter just fine. I've followed both yours and Andy's settings to the letter but I cannot get the RCV below 3.555v without getting a send / logic error. I've tried on the phone app and with the pc connected. Any thoughts on why this might be happening ? Thanks.

[@GrantBurton]

Hi, thats great news that you finally have the batteries built (not so great about the sheared off terminals). You mentioned you have followed Andy and my setting exactly but just to check... What is your SOC-100% Volt and Cell OVPR set to? These values need to be set lower than the RCV that you would like.

[@kennyrodg]

@@GrantBurton Good Morning Grant. So, my bad....I think. I just double checked and my SOC-100% was 3.499 when it should have been 3.449. OVPR is 3.448. I guess I couldn't see the wood for the trees lol. Thanks for the prompt to check it though, it's now accepted 3.450 as the RCV. I guess my version of following things "to the letter" did not pass muster. As ever, very much appreciated.

[@GrantBurton]

@@kennyrodg Awesome, glad you are now sorted. Not to worry, that has also caught me out a few times already.

[@beckenbauer1974]

What If I have 2 JKs and 1 inverter? Can I see both BMS on the Inverter's screen?

[@denveronly]

Excellent work! Would be interesting an error transition from bms to inverter Will it display and trip on overtemp, cell lost etc

[@GrantBurton]

Hi, thanks very much. I've tested the over temperature and under temperature conditions and how they interact with the Inverter... here is the video kzbin.info/www/bejne/qH3QgGB-dtFnhqM There are also a few other videos where I test various other BMS and Inverter related things... here is the playlist if you are interested kzbin.info/aero/PLb9ne7k5ibApAQJLRDXyU5pUwrWg0H7MS

[@attic1537]

3 MPPT trackers? What Sunsynk model do you have?

[@GrantBurton]

It's a SunSynk single phase 10Kw Inverter.

[@benschippers3782]

So..... what would the best settings be? Building three 15kw battery's with JKbms's for a Deye Hybrid inverter.

[@GrantBurton]

Hi Ben, the settings would depend on the specifications of the cells you are using and how hard you want to use the cells / battery, and how much headroom you want to leave for protection. I've been somewhat conservative with my settings. As an example, some of the basic settings I have been using on my battery setup: - RCV of 3.45v/cell - RCV Time of 1 hour - RFV of 3.35v/cell - RFV Time of 10 hours - Start Balance voltage of 3.45v/cell - 100% SOC of 3.449v/cell - Charge / discharge current would depend on capacity of cells. - Over voltage protection of 3.65v/cell - Over voltage protection recovery of 3.448v/cell - Under voltage protection of 2.6v/cell - Under voltage protection recovery of 2.65v/cell - Power off voltage of 2.5v/cell The settings listed above may not be correct for anybody else's battery / BMS though. As for the best settings, or the specific setting each person should use for their specific battery / BMS... I think those settings should be decided by whoever is building or setting up the battery (BMS) because mistakes could end up causing damage and being costly.

[@ipstacks11]

I have 2 Deye 8kw inverters, in parallel, and 6 200ah 48v batteries with all the negatives tied together and same with the positives which is also in parallel, I am pretty sure. I want to add batteries and the installer said the batteries I have are 280v, which is referring to the cells in the batteries, I think. Anyway I want to add batteries that aren’t the same as these because the ones I have aren’t available anymore. It looks like if I put JK BMS’s in the batteries and connect them all on the canbus, then dissimilar sized lifepo4 batteries will work because the JK BMS will protect them from over/under charging/voltage. Does this sound right?

[@GrantBurton]

Hi Jeff, I'm not exactly sure because I've never tried this myself.

[@ThePonderi]

How does the surge capacity work with these limits setting?

[@GrantBurton]

Hi, do you mean how much the battery charge / discharge current could surge past these limits before the current is brought back to the limit? I'm not sure how much or how quickly the Inverter / charge controller would react to massive surges, but I guess if it goes to far to quickly, it will just cut off. I haven't (and can't) test the surge capacity of the 150A BMS's I have... According to JK's website, they can supposedly handle a surge of 300A for a 2 minutes.... thats way more than my capacity of batteries could handle. I'm not sure is there is a surge limit percentage that would apply above the Continued Charge / Discharge limits in the BMS, but that might be a nice feature. If you have a high current capable BMS (200A) but only want to use a low charge / discharge limit like 50A, and if passing 100A surge, it must immediately cut off no matter what, but between 50 and 100A the Over Current Protection Timer (and current limiter for charge) is applicable.

[@PhilippeCJR]

Can you make a video how to smart instruct the Deye? Like with HomeAssistant, and a dynamic hourly grid contract? (a bit like solarassistant)

[@GrantBurton]

HI Philippe, I might look at doing something like that in the future (maybe)... will have to see how things go, I'm not expert at Home Assistant. I think there are a few other videos on KZbin about the Sunsynk integrations into Home Assistant already.

[@divanmeyer-wv7pk]

Where are the stockkars video's???

[@GrantBurton]

Hi Divan, time and resources have been a bit limited lately so I've had to take a step back from that.

[@SiBex_ovh]

Please create a yt playlist with JKBMS

[@GrantBurton]

@@SiBex_ovh Hi, there is a playlist with all of those related videos already, it’s under the Solar playlist… here is a link Off-Grid / Solar Power Backup / Green Energy kzbin.info/aero/PLb9ne7k5ibApAQJLRDXyU5pUwrWg0H7MS

[@adityabaradia3675]

Very informative video 👍 Sir can you please help me, I am using Deye 5 kW hybrid inverter with DIY lithium 5 kWh battery (106ah) with JK inverter communication bms (150a) Currently when I turn on the inverter on battery only (below 20% SoC) (no grid input, no solar input) the output load is not not turning on. As soon as I unplug the communication cable, inverter reads wrong SoC and it turns on the output load. Or when I give grid input, it turns on the output load. It's working normally on SoC above 20% .. I mean booting normally and turning on output load. Thanks in advance sir 🙏

[@GrantBurton]

Maybe check on your battery settings… Settings > Battery > Shut Down menu (3rd tab at the top of the Battery Setup page)… is the Shutdown setting maybe set to 20% This could be causing the output to turn off when the battery reaches 20% SOC.

[@adityabaradia3675]

@@GrantBurton tried that sir, same issue, i even set them to 0,0,0.. then also same issue.. I also have downgraded both the firmwares , deye's and BMS's., still no luck...

[@GrantBurton]

And what are the Time of Use settings in the System Work Mode menu?… are those set to allow the battery to be used lower than 20% SOC?

[@adityabaradia3675]

@@GrantBurton that setting is turned off sir.

[@GrantBurton]

What if you try turning it on and setting it to 5% or 10% and see what happens?

[@zoheb4you2002]

I hve the same inverter in my case my jk bms is passing the current even in off mode...bms as soon has reached the lower voltage it shutdown but still it passing the voltage and my battery voltage is reaching 0 %

[@GrantBurton]

So in the JK BMS app, on the Control tab, if you set the Discharge setting to 'OFF', does it still allow the battery to discharge?

[@zoheb4you2002]

@@GrantBurton unfortunately yes 😥 rest of the two switch charge and balance is following the rule but discharge switch even it is off it is passing the voltage

[@RNPT1999]

Thank you . Grant Burton.Nice video. Are you interested in our Active Balancer,Smart Active Balancer,Smart Active Balance BMS? We can provide sample for your testing . Inverter BMS Compatible with Growatt/Victron/Deye Inverter.We've actually tested and matched most of the inverter brands on the market.and they work very well

[@GrantBurton]

Hi, thanks very much. You are welcome to contact me by email to discuss further... my email address is in the about section on my home page.

[@DipanjanDas23]

Hi Jerry .. Does 100 balance have active balancer

[@GrantBurton]

@@DipanjanDas23 According to their website, it looks like they do have an active balancer but haven't tested any of their products.