wiring res fridge

Almot wrote:
Plug it direct into inverter.
("Behind the fridge"? Inverter? Isn't it supposed to be near the batteries? Ok, it's never late to learn)...

So, - plug it direct. Then go on grid, turn inverter off - ops, fridge stops. Or don't turn inverter off, let the battery cycle like crazy and keep your fingers crossed that converter will catch up. Or get ATS. Plenty of choices :)

Yes, dedicated inverter can do, and it doesn't have to be powerful, your fridge is probably ~100W.

Why would the battery cycle at all with 100w load? Converter will easily hold float voltage. Only cycling will be when off-grid camping.