Phil, it just depends on the size of the inverter, the number and size of batteries, the loads you will be using, and how much money you are budgeting for this addition. Many are using a single direct wired plug in, that is a dedicated power cord for a single load. One member just opens the laundry chute and plugs in the power cord.
I have a 3,000 watt inverter with only two golf cart batteries, (I can add two more later if we decide to Boondock) I use a transfer switch that powers up my entire panel. When doing this, you have to turn off any breaker that you do not wish to use, but it gives the option to power any circuit that will be needed, and your batteries will handle.
Remember to shut off the converter breaker when using the inverter if you go this route.
Good luck.
Ozz
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