Even though 6-gauge is rated to handle the current, heavier gauge will actually work better.
You can’t go too big on the battery cables.
I just installed a Xantrex ProWatt SW2000 in my camper, I used 2-0 (that’s minus-2 below zero gauge).
Xantrex sells a very nice auto transfer switch, it’ll default to inverter power and switch to shore power whenever there is any. I put in two, one for the microwave outlet and one for the kitchen counter outlet. They’re like $50, and then you don’t have to do anything.
Also for like $20 Xantrex sells a remote control switch for the ProWatt SW series.
Then it’s really easy to use the thing.
