Software update for B300S

Product Discussion BLUETTI AC Series
1

I have AC500 with one B300S and I’m experiencing problems with SOC. For example, sometimes the system charges (from solar) with 500W for an hour, but SOC stays almost unchanged. Then later, SOC suddenly jumps up to 100% or so. The BMS is v1022.09

Would like to update the BMS to the latest version, which was mentioned here:

The serial number is AC5002241000496080

Please push me the latest version, thank you!

2

Hi @southside, Thank you for getting in touch with us.
We have pushed the new BMS firmware for you. Please upgrade the firmware tomorrow. Please do not load any device when upgrading it.
Please update each battery one by one, connecting only one B300S battery at a time.


After that, please try to complete the cycle of discharge and charge to correct the SOC. The problem will be resolved.
Please follow the steps below to recalibrate it:

  1. Please discharge all the power (charge AC & DC appliances with the power station) until the SOC is 0%, turn off the machine, and leave it for 3 hours till it cools down.
  2. Please charge it again, please do not load any device when charging it, and do not interrupt it while charging.

You can click this link for reference.

Please let us know if it does help.

3

Thank you for pushing the Update! The BMS on my system is now version 1022.14

Then I performed the discharge / charge steps. So far, everything looks okay again.

I will monitor the system for some time and then let you know the result.