B230 - Jumps from 40% to 100%. 1 cell 0,47 Volts higher than other cells

Product Discussion Expansion Battery
1

Hi All,

in another Thread I was already starting to share an issue I have with my new B230 from the beginning:

  • Charging Status jumps from e.g. 40% to 100% within a second
  • B230 turns off automatically
  • received “BMS overvoltage” error for the B230

What I did already:

  • discharging/re-charging with external AC power on B230 directly
  • turning B230 off and on again after some time, this usually “resets” the charge status to a realistic value

This here shows the jumping to 100%
image

What I realized now digging into the values is that 1 cell of the B230 has a much higher voltage. Cell 5 is some 0,47 Volts higher than all the other cells which seem to be pretty balanced:

image
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This would explain why the BMS thinks that the whole battery is full and stops charging - 1 cell is already over the limit.

Any hints how I can work on solving this by balancing the cells?

2

How did you read the individual cell voltages? I am interested to use the same method to read cell voltages on my four B300 batteries.

3

You can find some links in the above mentioned thread. The package is available on GitHub: warhammerkid / bluetti_mqtt.

4

On the AC300, you can also get access to a “BMS Maintenance” screen by going to “Data” → “Battery Information” and pressing 5 times in the top left corner on that screen (you’ll hear a beep if you’re pressing in the right place).

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2 Likes
5

@ra-ma , I’m very sorry for the inconvenience. In view of your problem, the support department is already following up for you. Please keep an eye on the email address sale-eu@bluettipower.com for more details. Thank you very much for your understanding and cooperation.