I always liked the MANUAL SWITCH idea that uses one of these BLUE SEA bank switches... This allows you to set up zones without two much wiring problems... You can add as many 120VAC zones as you want to...
You can run all zones when on shore power or run selected zones when running off the Power Inverter. Keeps you from having to shut down things you don't want to be running when on the Inverter or small generator that won't run your whole 30A trailer...
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Google Image
Google Image
The typical wiring diagram would look like this...
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A little more work than just adding a CHANGEOVER RELAY Transfer Switch but gives you better control on what you want to have running on each position...
Roy Ken
