backchannel: array voltage on MPPT controllers

[Responding to a clueful commenter in this thread]

if the batteries were disconnected by the BMS, the system voltage could spike, causing the over voltage warning on your inverter.

Agreed, that can absolutely happen. Not sure that’s the case here since charging doesn’t seem to be active when the inverter is turned on. Hard to tell from the write-up.

Impossible to properly diagnose with limited information

doubly agreed! :-)

connecting to the MPPT solar charge [controller]

it sounds like the solar panels should be hooked up in parallel, just as the batteries. 18 to 20 volts is the typical static voltage for a 12 volt panel or 12 volt panels in parallel, while 2 in series would be about 36 to 40 volts

Sounds like OP is running a Victron setup. I think the lowest input voltage rating on any Vic MPPT is 75v, so either way should be acceptable. MPPT efficiency curves vary, but conversion losses tend to be lowest when array voltage is 1.5x-2x bank voltage if that’s an important factor for them.

Is the charge controller variable voltage capable of 24 volt input and stepping down to a 12 volt battery pack?

OP’s MPPT controller will buck the voltage down appropriately. At this moment my Vic is running the array at ~95v and the bank is 13.16v.