Surely the PV output (± battery) does not have to join at the origin?

If the PV array shares a distribution circuit, does it need RCD protection at all?

Surely the PV output (± battery) does not have to join at the origin?

If the PV array shares a distribution circuit, does it need RCD protection at all?

Does it come down to the inverter having simple separation. Transformer-less inverters may be able to feed a DC fault current into the AC side (Reference COP) The DC element May blind the split board RCD and potential leave other circuits without RCD protection.