I think you got some bad information. Residential refrigerators are set up to run off the inverter, which makes 120V from the house batteries 12V.
Different manufacturers use different components and can wire differently, but to give you a reference on a Tiffin 33aa same year coach....my inverter is 2000 watt.
The circuits it powers are:
- Convection Microwave
- Entertainment (TV's, BlueRay, Satellite, etc)
- GFCI sockets (bathroom, kitchen, dinette, etc)
To run high power devices while driving, you'd need to run the generator
- air conditioners
- electric hot water heater
Your setup might be slightly different.
DaveB, Raleigh, NC
2015 Tiffin RED 33AA
2014 Honda CRV