B300 Expansion Battery Wont Charge Past ~60%

Product Discussion Expansion Battery
1

Hello,
I have an ac300 with 4 b300s attached to it. Ever since the last firmware update, one of the b300s will not charge past 60ish% via solar. I have done a full drain without any luck. Currently I have that battery plugged to the ac300 by itself, and it stopped at 62%.

Please advise.

ac300
dsp 4031.30
arm 4032.11
hmi 6029.11

B300 - v1021.11

2

Can you test only the problematic B300 with your AC300 connected to utility power? All other batteries not connected? Will it charge past 60% now. If you discharge just that one battery and then recharge it, both via your AC300, will it charge to 100%?

3

Hi @rando_specs, Could you share your AC300’s SN number? We want to push the new BMS v1021.13 to help resolve the issue.

Thank you, @TheQuickFox, for your helpful suggestion. Please connect the B300 directly to the AC300 and charge it using AC power. Alternatively, you can disconnect it and charge the B300 separately using PV input. Note that the B300’s solar input voltage range is 12-60V, so please ensure your solar panel specifications meet this requirement.

4

Thank you @TheQuickFox ! I gave it a shot and it stopped charging at 96% this time. Was going to do a full drain and charge the next time, but looks like they’re going to push a new firmware out. :crossed_fingers:

1 Like
5

Thank you @BLUETTI_CARE !

my ac300s sn is 2227000404699

6

Hi @rando_specs, Now I have applied to upgrade your firmware.
Our IT department will push the latest version of firmware to your unit in 1 workday.
Please upgrade the firmware tomorrow. Please do not load any device when upgrading it.
We suggest you recalibrate it after upgrading.
Please let us know if it does help.

7

Thank you @BLUETTI_CARE . Did the firmware update this morning and had been charging via solar. The SOC was at ~42% when it suddenly jumped to 100%. Is this normal?

8

Hi @rando_specs, Thank you for getting back to us so quickly.
It seems abnormal, please recalibrate the AC300+B300 set, which does help to resolve this problem.


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 in charge.

You can click this link for reference.

Please let us know if it does help.
If not, please contact us for further service.

9

@BLUETTI_CARE thank you! so I did the discharge and charged it back up to 100%, connected the other 3 batteries back together, now the ‘suspect battery’ will not discharge. it’s constantly at 100% whereas the other batteries have been discharging. they’re currently at 62%, 52%, 57%

10

It’s probably not it, but if you’re not tired of testing yet:
Can you connect the problematic B300 battery to your AC300 to a known good port and with a known good cable. Just to make sure it is not a problem with one of your cables or one of the battery connection ports of your AC300. Just to make sure you do not send in a heavy B300 for repair while the problem turns out to be with the connection to your AC300.