Hello,
For my installation, i have a 3 pole changeover switch to backup grid with my MG in V2L mode.
3 pole for Live+Neutral+Earth.
In grid (normal) mode, i use L+N from electricity provider and Earth from a ground wire (in fact, N).
In V2L (backup) mode, i use L+N+E from vehicule socket.
With this setup, i use earth from vehicule (should be N internally), to activate as many protections as possible.
My use case is only in case of grid shortage (2 to 3 times a year, for some hours).
When using V2L i manually switch off not used circuits in my house (heavy loads, in fact), then switch the 3p changeover switch. I have some lights to indicate power source (grid or vehicle), and also indicates me than grid power is up again.
In my last test, MG ZS furnished as much à 2kW, not tested more.
in one of test case, V2L switched off with one circuit : too much power ? current fault ? don't remember well.
Véhicule switched off V2L by himself, then it automagically restart some tens of seconds later.
Must have occasions to test it, but pretty sure than V2L is really much more capable than 2kW.
I will then take care about cable section if more than 3kW was used.
For my use case, i voluntary limit power use to about 1 to 1.5kW (freezers, lights, adsl, tv, cellphones charger, ...) to keep vehicule battery capacity for up to a 2 days shortage.
No more using a loudly fuel generator !
V2L is very great out of cities.