Hi recently returned to the boat which had been on shore for past 10 months (not connected to power). 2x Li-ion HE Batteries (2x200Ah) seemed okey so started updating all systems (Venus GX, multiplus, mppt, BMS400 etc).
I notice in the past week that the battery level seems to be wrong. I reset consumption stats but still at about SOC 60-65%, voltage will be <24.5v indicating it is much closer to empty.
At this 65% SOC level the multiplus also turns off by itself and no longer inverts... again suggesting SOC is wrong!
I am not getting multiple low cell voltages and have no idea how to solve this?!!