On a 12v 860Watt PV panel system do the panels need grounding to earth?
The charger/inverter is charged by the mains.
The panels supply some 12v power for the batteries.
The inverter only supplies 240v to a non-mains circuit.
No panel earth point indicated on the inverter charger.
The inverter/charger relays the, mains/battery power supply earth, depending on the supply.
I have an earthing rod ready...