Phoenix Low Battery alarm using Remote switch

When I turn off the Phoenix 48/500 with the remote switch, it sometimes gives a “low battery” error to the Cerbo / VRM.

Batt is 30kwhr with MPII 10k. Its full.

Firmware is current.

Any ideas?

It is getting enough time to send a low battery error before the control voltage decays. The remote switch is probably turning off the 12v supply to a regulator, and the battery voltage is sensed on the regulator supply, not the battery terminal. This could be a firmware bug, needing a delay in sending the low battery error, if this can’t be set up in the configuration.

is there a setting for low battery detect, voltage for x minutes?

Only 3 voltage settings. One particularly relevent.

The remote input (small black loop) carries tiny mA of current, just enough for a red led