https://www.victronenergy.com/media/pg/The_Wiring_Unlimited_book/en/ground,-earth-and-electrical-safety.html section 7.7 "System grounding" if you follow the diagram earthing it clearly shows battery negative to earth along with inverter chassis, given that the neutral of all victron inverters rated 1600VA and above and the Phoenix Inverter Compact 1200VA is connected to the chassis. Earthing the chassis will therefore also ground the AC neutral ( to the same point). Therefore AC neutral is connected to dc negative, my system also has ac neutral to earth "men" (Multiple Earthed Neutral)at the ac switchboard and the earth is the one common ground stake shared by everything This seems to be discouraged as a safety issue on various sites, question is should I change it and if so how.