AC500, 2 B300S, Charging only to 30%

Product Discussion BLUETTI AC Series
1

I have an AC500 and 2 B300S
I drained the batteries to 0% as instructed to do every 6 months
I am recharging them on the grid, but they only charged to 30% and stopped charging
When I look at the SOC for each battery individually Pack1 shows SOC 21% and on Standby. Pack2 shows SOC at 40% and on Standby (that makes no sense). The AC500 is plugged into the Grid but shows 0w

This happened to me over a year ago and Buletti replaced both batteries. Now the same thing is happening again.

IOT - v9041.10; ARM - v4044.07; DSP v4045.30; BMS v1022.09

2

Hi @SureHope

welcome to the bluetti community forum!

Can you see any kind of error code on your AC500? Does is charge with solar or do have both input methods this problem?

Thanks
Erik

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3

Thanks for responding, Erik. There was an error code showing that the SOC was 0, but after it started and now stopped charging there has been no error code. I’ve only charged with the grid so far.

4

Hi @SureHope, We would like to confirm whether both of your B300S units have BMS version v1022.09.
Is the ambient temperature suitable?
We recommend disconnecting them from the AC500 and charging each B300S separately. It would be even better if you could test both AC and DC charging.
Have you tried recalibrating the batteries? We suggest trying again—does this help?
Many thanks to @Selfmadestrom for the concern and assistance on this matter.

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5

I drained one of the B300S units to 0% SOC again, and recharged from the grid. I immediately got this Alarm - 054 D-Bat Drained. The AC Input charge leveled at 1750W and charged the B300S to 30% and stopped charging (AC Input 0W). I am very concerned that this is the second time this has happened, originally with the initial B300S units I purchased, and now with the 2 B300S Units that Bluetti replaced. What now? Is the problem with the AC500?