I have recently installed a Multiplus II 2X120 on a boat.
The AC in is connected to a 240V split phase input from a generator or shore power via an ELCI breaker/circuit.
The AC1 output 120V is connected to a Victron autotransformer (not connected downstream yet). It will be a step up to 2 phase 240V when complete to run air conditioners via the inverter.
The AC2 output 240V 2 phase is connected to the 240V panel.
Prior to installation of the Multiplus, the generator or shore power directly supplied the panel.
Since introducing the Multiplus II between the ELCI and the panel, the reverse polarity light turns on at the ELCI when the breaker is engaged (on) at the 240V panel. The light does NOT come on with the panel breaker off.
The Multiplus charges properly and seems to operate correctly stand alone, ie the panel breaker off.
Any ideas why the reverse polarity light turns on when the panel breaker is on? Is there a setting (ground relay) that should be changed?
Any help or advice appreciated.