AC200L + B300K SOC drifting apart, Customized UPS mode SOC 20%-70%

Product Discussion BLUETTI AC Series
1

I got this AC200L + B300K combo to act as a UPS for our refrigerator.
I set customized UPS mode with 70% SOC for upper threshold for AC charging.


It seems to be known in several posts here that the internal components draw from the battery and slowly drain the battery which then recharges.


However, with two packs, and the SOC target of 70% this is slowly causing the packs to drift apart.

  • initially they were 66% (AC200L) and 74%. (B300K)
  • now they are 61% (AC200L) and 79% (B300k)

it appears that the AC200L is doing the self discharge, or self discharging faster, then they are both being charged in parallel til they average the 70% target again. causing the B300K to keep rising higher.


I expect they will drift until they reach 40% + 100%

2

24 hours later they are at 56% and 84%.

3

Hi @Merle, Could you please provide the SN code and the current firmware version of your AC200L?
We will check if there is any new firmware available to optimize the SOC balancing performance.

4

Thanks. I sent them to you via DM.

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