diy solar

diy solar

JK BMS cell count error

T

teckersley

New Member
Joined
Dec 30, 2022
Messages
33
Pulling my hair out. After lots of reading and Dr Google, I can’t pinpoint the problem.

Just hooked up the 2A24s jkbms. Turns on fine amd seems to be working fine with the exception of a cell count error.

Cell data is only showing 7 of the 16 cells.

All data pins have continuity through the plug connection and the random
Cell error is not common to either plug.

Attached is a screenshot.

Any ideas are greatly appreciated.
 

Attachments

  • A5D8924F-A5E0-4CD1-A53C-2328A11C7C59.png
    A5D8924F-A5E0-4CD1-A53C-2328A11C7C59.png
    723.5 KB · Views: 8
In the pic here I swapped the #2 and #3 leads. The data did move but not to #3 as I would have expected. It went to #4. ?‍♂️. I thought JK was a good brand. Am I missing something? Seems very odd new out of the box.
 

Attachments

  • 2745A3D9-2F67-4A8B-9390-D67E01F828BA.jpeg
    2745A3D9-2F67-4A8B-9390-D67E01F828BA.jpeg
    242.9 KB · Views: 10
Last edited:
teckersley said:
Pulling my hair out. After lots of reading and Dr Google, I can’t pinpoint the problem.

Just hooked up the 2A24s jkbms. Turns on fine amd seems to be working fine with the exception of a cell count error.

Cell data is only showing 7 of the 16 cells.

All data pins have continuity through the plug connection and the random
Cell error is not common to either plug.

Attached is a screenshot.

Any ideas are greatly appreciated.
Click to expand...
I had the same thing happened.

Plugged in a spare and it worked fine.

Bad BMS.

It’s either the connections or the BMS.
 
teckersley said:
All data pins have continuity through the plug connection and the random
Cell error is not common to either plug.
Click to expand...
Does this mean you checked the voltage at each pin (2-17) against pin 1 (negative)?

What version firmware are you running and have you changed firmware or the app recently?

Happen to have a pic of your battery wiring?
 
MisterSandals said:
Does this mean you checked the voltage at each pin (2-17) against pin 1 (negative)?

What version firmware are you running and have you changed firmware or the app recently?

Happen to have a pic of your battery wiring?
Click to expand...
no it means i checked each wire for continuity from the terminal end through the plug connector to make sure each plug was good. I also checked voltages at each cell and they are fine. I have done the easy/obvious stuff. But just to put it to bed, I will do this the next time I am messing with it but I have to assume if each voltage is correct and there is continuity, thats not it either.

I would have to connect to it and check the firmware. It's straight out of the box so I doubt thats the cause.
 
teckersley said:
I would have to connect to it and check the firmware. It's straight out of the box so I doubt thats the cause.
Click to expand...
There was a recent app release made quickly for a different issue. Maybe try the new firmware as that would be a common support center recommendation.

diysolarforum.com

JK-B2A8S20P-H temperature sensor problem

I have two lifepo4 self builds, using a JK-B2A8S20P-H in each battery pack. I refer to them, very imaginatively, as BAT 1 and BAT 2. They have been running faultlessly as solar storage since September 2022. A few days ago while taking my usual system logs, I noticed temperature sensor T2 on BAT...
diysolarforum.com diysolarforum.com
 
teckersley said:
no it means i checked each wire for continuity from the terminal end through the plug connector to make sure each plug was good. I also checked voltages at each cell and they are fine. I have done the easy/obvious stuff.
Click to expand...
MisterSandals said:
There was a recent app release made quickly for a different issue. Maybe try the new firmware as that would be a common support center recommendation.

diysolarforum.com

JK-B2A8S20P-H temperature sensor problem

I have two lifepo4 self builds, using a JK-B2A8S20P-H in each battery pack. I refer to them, very imaginatively, as BAT 1 and BAT 2. They have been running faultlessly as solar storage since September 2022. A few days ago while taking my usual system logs, I noticed temperature sensor T2 on BAT...
diysolarforum.com diysolarforum.com
Click to expand...
yep. I am on 4.10.1 and i am getting voltage on all pins that is adding up to the pack voltage at #16 @ 55.91V.
 

Attachments

  • 6FA2EF43-A259-454B-9ABF-E5F0EFF5F020.png
    6FA2EF43-A259-454B-9ABF-E5F0EFF5F020.png
    411.1 KB · Views: 7
Edit. For anyone reading this in the future it wasn’t a bad BMS after all. With a good night sleep and some coffee ?to calm the frustration, I took another close look at everything. Turns out, one cell lead was out of sequential order and it threw everything off. It’s working well now.

Lesson learned: double and triple check closely. For me, it was check #5 or #6 ?‍♂️
 
Always install the harness in correct sequence, verify the continuity of each lead to ensure you have a good connection and only after then do you connect it to the BMS. IF the wires get installed out of sequence & connected to the BMS there is a possibility of damaging the BMS, a failure may result shortly after it goes into operation. The same applies if someone accidentally runs (+) through the BMS as opposed to the (-), it will still work but the BMS' lifespan is affected if it does not outright fail as a result. These are sensitive electronic devices and must be treated accordingly.
 
Can anyone here manage to submit a support request at JK BMS site ?

www.jkbms.com
www.jkbms.com

The hour clock just circles forever.
 
On my JK's there was an extra lead wire that had to be connected in the right cell or half my cells didn't show up. You can't just start at one end and go along or it won't work. Stupid extra wire.
 
You must log in or register to reply here.

Similar threads

K
Dead cell sample lines on JKBMS JK-B2A24S JK-BMS >> FIXED
2
Replies
28
Views
1K
keepsake
K
dakamalu
JK BMS Cell Count Problem on B2A24S20P
2 3 4
Replies
79
Views
5K
keepsake
K
K
JK BMS Strange “Battery is Fully Charged” error message
Replies
0
Views
406
Kaise123
K
meetyg
JK BMS cell UVP ‐ Prevents charging via AIO inverter
Replies
5
Views
481
Skypower
S
I
JBD BMS can't change the cell count
Replies
3
Views
620
isso777
I
Back
Top