Need help with JK BMS and Deye inverter.

[reg.s]

Hello, friends. My BMS is giving me errors and I have no idea why. My configuration: panels 13kwp, inverter Deye 16kw and 2 DIY batteries. Each battery has 16 cells EVE 280 and JK BMS PB2A16S15P. The inverter is configured to communicate with the BMS via CAN. The two BMS are connected in parallel and communicate with each other via RS485. All JK BMS have been updated to the latest firmware.

I did the system and BMS settings myself, but I am obviously missing something. I have been reading and educating myself on this for almost a month now, but to no avail. It's driving me crazy, I can't sleep peacefully, I would appreciate if you could help with any idea why I'm getting these errors.

Here is what I get.
1. In good weather the overcurrent protection is activated almost constantly. Sometimes only on the first bms, but almost always on both.
2. Sometimes a "PL Module Abnormal" error appears. Happens more often on the first bms, but very often on both.
3. Occasionally something called a "PCL Module" turns on, limiting the battery charge to 10A. I have no idea what this module does, how it turns on and off. This also happens more often on the first BMS.

Often the second battery manages to charge to 100%, while in the same time the first (where the errors occur more often) barely manages to charge 30-40%

Here are the BMS and inverter settings. At the bottom I will attach pictures with the errors I get.











The inverter understands when I make changes to the BMS settings, for example when I change the charge and discharge current in one of the BMS the changes are reflected on the inverter display. Also, if I stop the charge or discharge in one of the BMS settings, the inverter also changes the charge and discharge currents on its display.





Just in case I tried to further limit the charge and discharge currents through the inverter to 54A, while in the bms I set a limit of 60A, but again over current protection is triggered...




I don't have any more ideas, where I'm wrong and how to deal with these errors ...

 

[houseofancients]

Give a similar topic with a sunsynk( same as dey), I'd say jk still is very beta and simply not working

Sunsynk battery settings for DIY pack

I have a sunsynk 8.8kw hybrid inverter and a DIY battery bank of 32 cells, Envision ESS 72173207 305Ah, 2p16s, connected to a JKBMS JK-PB2A16S-20P I have these values set at the inverter and was wondering if they are correct: The BMS also has float mode enabled, so not sure if the BMS values...

diysolarforum.com

 

[Sky-HHI]

You should check out Off Grid Garage on youtube. Andy has a video of his settings for these jk bsm, some problems with these bsm and solutions for these bms. He likes them and has regular contact with Jk to resolves issues he and his followers find. Good Luck.

 

[reg.s]

You should check out Off Grid Garage on youtube. Andy has a video of his settings for these jk bsm, some problems with these bsm and solutions for these bms. He likes them and has regular contact with Jk to resolves issues he and his followers find. Good Luck.

I've watched Andy's videos, they are very helpful and I've learned a lot from them, but I still couldn't solve my problem. I think there is some problem in the BMS-Inverter communication and even though the two devices are talking they can't understand each other.

 

[MisterSandals]

There are 540 detail log entries. Have you looked at them?

 

[LydMekk]

Turn off "Activate Battery". This will reduce the charge to a trickle and are ONLY for damaged or extremely low batteries.

Btw. are your BMSs both updated to the latest firmware? As you are aware there has been some developments in that lately if you watch Andys offgrid garage. Not sure if said if these are the latest JK inverter type or the older models. The older ones are good with FW from version 11ish on.

 

[reg.s]

I think I found where the problem comes from. In the case where there is communication between the inverter and the BMSs, the maximum current is taken from the BMS settings. For the tests, I disconnected the connection between the inverter and the BMSs, and configured the inverter to monitor the batteries by voltage, so I could set the max charge current from the inverter settings.

In the inverter, the "Max. A Charge" was set to 110A and in the BMSs it was set to 55A for each battery. I changed the settings in the BMSs from 55A to 75A in each BMS, then monitored what current each battery was charging at. With 110A released from the inverter, the first battery takes ~58A and the second takes ~52A. I played around with the maximum current the inverter puts out to the batteries, and in each case the first battery always charges at a slightly higher current than the second. If the current exceeds the limit set in the BMS the Over current protection is switched on in the first battery, the BMS switches off the charging and all the current released by the inverter goes to the second battery, where accordingly also the Over current protection is switched on.

I was thinking that by setting Continued Charge Current at 55 A for example, the BMS would limit the current to 55A. Apparently this is not true.

Why do you think there is a difference in the charging current of the two batteries? What is the option to be able to control the charge and discharge current for each battery separately?

 

[Sky-HHI]

How are your batteries connect in parallel? Can you switch the batteries around to see if the trouble followes a battery or stays the same. You could switch the bms around to see if the trouble followes a bms.

 

[reg.s]

How are your batteries connect in parallel? Can you switch the batteries around to see if the trouble followes a battery or stays the same. You could switch the bms around to see if the trouble followes a bms.

Thank you. I'll play with swapping cables, batteries and bms's this weekend.

 

[vin666]

Hi Any updates?

Did you solve the issue

 

[bogi]

Any update? Interesting subject.

 

[prosier]

Any update?

 

[prosier]

Bytheway, your UVPR, and the about 5 setting below that, are wrong I guess.
UVPR is 2.6 and UVP is 2.55 for example...not 3.xxx like in your screenshots.

 

[dr00p]

Hello Everyone, Sorry for being all over this forum from time to time. And also for bumpin this old thread.

Though I got a new setup, it has been working since a week now, jay! It consists of 6 solar panels, giving roughly 1000-3000w, connected to a Victron Multiplus2 and two MPPT's. And also a battery with a JK-BMS.

Anyway, I got the same error as topicstarter Reg.S has in my JK-BMS: Namely the "PL Module Abnormal" flashing in the main screen of the JKBMS (Reg.S has an screenshot of this in his opening post). Does anyone know what this stance for? PL Module? Protection Limit Module? I don't know?

I think this is something different from the PL module error/warning:
But I reckon the the PCL module is the balance module? So I assume anyway. Because I have my battery balancing as we speak. And I simply don't have so much expierence looking at what is happening, with the system. So I could be wrong I mean. Though again, feels pretty safe to assume the the PCL module is the module handling the balancing? And apperantly it does so with a current limit of max 10A. Because just like TS Reg.S, this happens at my place as well.
Also, here too, when PCL module is on, it says "Charge" is off (just like Reg.S), though it does charge a little. I can see in my Victron VRM.

And also to add: My cell volt difference is set at 0,005V (instead of 0,010V). And while it did ballance the last 20, 30 minuts or so, My cell volt difference is right now: 0,015V.
Anyway, this whole message of me is not right I see now. Not correct. Because PVL module is off. Charge is on. It is discharging as well btw (and did not in the previous half hour). But it does kick in Balancing as I'm writing this.

So hopefully I awnsered that question, what is the PCL module. (..) (I didn't)
PCL? Protection Current Limit? I dunno?
Though it had a Current Limit error today, before. Hours ago. Which I could fix away by limiting my charge current from the Victron Multiplus as well as my MPPT's. Also, I'm fairly sure that when I had "Charge Overcurrent Protection", the PCL module was off all the time.

I still think the PCL module has to do with balancing. ? (btw, my capacity limit is 10% and when PCL kicked in it was about 20% full, so it isn´t that PCL kicks in when battery capacity is low? I guess? Or anyway, capacity limit is set on the Victron side of course. And also my install is fresh, so maybe battery still has to set/learn itself (you know what I mean).

But I still don't know what "PL module abnormal" stance for. And it has been flashing non-stop for the last 2 days. Or better said: It has been flashing since 2 days, when I also connected the AC-Out of my Victron Multiplus to a load. Which I had not had to do so the say five days before: It was on, and working. But only thing it did was mostly charging. And mostly just fed my PV power to the grid. Battery just had not to so much.


I'm sorry, I am gonna post this. Please let me know if it is not appriciated, being an older thread. Though this was about the only usefull thing that came up Googling PL Module Abnormal. And I just wanted to add my 2 cents.
Lastly I want to add that I'm not experienced, nor an electrician. An enthousiast at best. So I'm just trying my best I mean. Anyway, In my own case I think I have to investigate DC ripple more. Thinking that maybe I put in to much charge current from different sources. Anyway, maybe that is what it comes from, in my case. And also: In my case there is only one 60Ah battery hooked on. Though I got 2 more, that I need to make and attatch. What I'm getting at is that maybe the one battery/JKBMS is to little, and that is why I get this PL module thing. ..
Sadly btw, the PCL module kicking in is not somehing registered in the detail and/or system log.

Edit: I added screenshot of my JKBMS app

 

[AshleyL]

PCL = Parallel Current Limiter.
It will limit the charge/discharge current to 10A if you have overcurrent protection triggered.

You should really check what causes the OCP to be triggered in first place.

Anyway, to reset the PCL Module abnormal message, you need to power off the JKBMS inverter and power it on again.

 

[dr00p]

Thank you, Ashley!

Does this mean when it is on, that current can only go in the JKBMS? Instead of flowing in and out bi-directional at the same time? (In my own layman words)

Thanks again! I will look into it.
I think for a big part, assume, that I should add my 2 more batteries. Right now I have a OCP of 20A (had it at 22, now 18A I believe). Which is appropiate for my batteries, if I'm correct. Anyway. Whith 2 more battery-modules (and than 3 JKBMS total) my charge current can go x3. Hopefully that makes the difference.

But anyway, thanks again!!

 

[AshleyL]

Thank you, Ashley!

Does this mean when it is on, that current can only go in the JKBMS? Instead of flowing in and out bi-directional at the same time? (In my own layman words)

Both, when PCL is triggered by OCP, it will limit both incoming and outgoing current to 10A.

 

[kommando]

PCL is off on both my batteries and they balance fine.

 

[dr00p]

Cool! Thanks! I edited my previous post, just to let you know.

I do want to add that I had quite a few Charge Overcurrent Protection errors today. But seemingly, I think, not every time the PCL was triggered.
But I could be plain wrong in that!

 

[dr00p]

Hi Kommado, Thanks for your reply! Yes, I was wrong! PCL has nothing to do with balancing. See Ashley's reply above yours. PCL module stance for Parallel Current Limiter. Which kicks in after an Overcharge protection.

 

[AshleyL]

Cool! Thanks! I edited my previous post, just to let you know.

I do want to add that I had quite a few Charge Overcurrent Protection errors today. But seemingly, I think, not every time the PCL was triggered.
But I could be plain wrong in that!

Trust me, you don't want the PCL to be triggered very often......or having the BMS to perform hard disconnect many times.......

 

[dr00p]

Oh by the way, Ashley, the message flasing is PL module abnormal (not PCL). Is that still about the PCL? Should I read it as Parallel Limiter Module??

In my screenshot of JKBMS app main srcee above, the PCL module was on. But mostly it is off (I have been staring at it all for quite some hours now ). So I added another screenshot. Where you can see the PL module abnormal flashing, while PCL module = OFF.

 

[AshleyL]

Oh by the way, Ashley, the message flasing is PL module abnormal (not PCL). Is that still about the PCL? Should I read it as Parallel Limiter Module??

In my screenshot of JKBMS app main srcee above, the PCL module was on. But mostly it is off (I have been staring at it all for quite some hours now ). So I added another screenshot. Where you can see the PL module abnormal flashing, while PCL module = OFF.

Yes, it is same thing.
You don't want to know why the PL module abnormal flashing after recovering from OCP.......

 

[dr00p]

I can't thank you enough Ashley, much appreciated!

 

[D. Abineri]

Yes, it is same thing.
You don't want to know why the PL module abnormal flashing after recovering from OCP.......

I would like to know why the PL module abnormal is flashing.