question

sub0 avatar image
sub0 asked

Bank discharged to 4% or lower after shore power disconnect.

Yesterday I received a "No data" alarm from the VRM portal. The last data received showed the battery bank discharged to 4% SOC. As it turns out, the shore power was disconnected and the bank had rapidly discharged due to the inverter being left on by mistake. Power was restored 12 hours later.


Some questions arise:

1. Why didn't the BMS or Cerbo GX switch off the inverter or battery bank when SOC was critically low?

2. Why did the VRM portal not send any alarm notifications as the system was being discharged? (Automatic alarm monitoring rule was in effect)

3. Can we assume that the battery bank was switched off at 4% SOC, or is that when the cellular router lost power and discharge continued to 0%?

4. Are the batteries damaged?


Look forward to your responses.


Paul


cerbo gxalarmdischarge level
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2 Answers
kevgermany avatar image
kevgermany answered ·
  1. Needs to be set in the inverter
  2. Depends on your settings
  3. Probably the BMS, router cuts out when its battery flat
  4. Assuming lithium and BMS set up correctly, no, BMS cuts battery to prevent damage from over discharge.
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sub0 avatar image
sub0 answered ·

Thanks so much for answering. Yes on Lithium.

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