2011 Mercedes 313 906
100% correct, if the charger is the more common transformer type the isolation is guaranteed if one device is connected to one power source at a time, be it generator or inverter there is no problem.All of these complications are moot
if you do not wire mains power circuits and outlets.
I like to keep things simple:
99.9% of consumption is direct DC, no inverters
any AC load devices plug directly into their inverter
if there were an AC outlet, it would be impossible for it to be fed by more than one inverter
the only thing fed directly from shore power or the genset is the charger, and that just physically plugs in
if I had electric aircon, it would also plug in like the charger, but likely to a separate AC circuit or genset from the charger
The complication is when multiple devices are powered at once and a ground connection is introduced, the interconnection issues begin via the common connection.
Most generators or inverters do not have an internal connection between one of their live wires and the frame/ground/earth and often these three are at not the same voltage, so by definition, there is no return path for a GFCI detection to activate ie no protection.
The only way I know to detect a Ground Fault in this situation is to measure the voltage between the live wires and earth and if either exceeds 40volts it can be potentially lethal.