Indeed, so not as simple as just the inverter sizing i think you have just agreed. The DC or AC determines if you can operate in a power cut...
Pretty straightforward terms.
Price for 3.6kW and price for 5kW was the original question if that helps?
Are there any EV's delivering an A/C V2G back through the type 2 even if it's only 3KW, just to augment house needs (needs a new architecture bi-charger and some frequency sync by car, too) seems VW id is a DC car output needing an accompanying sole supplier DC battery&invertor unit.