Inverter install can be complex or simple...your choice.
Complex is typically adding a second power panel with a transfer switch and moving the desired circuits to a feed from the inverter.
Simple can be 2 ways, "point of use" or a whole house (or mixture of these).
Point of use inverters involve getting 1 small inverter per device and wiring them as allowed by RV design.
For a Whole house, acquire the inverter of the max load anticipated, wire it to the house battery bank (keep DC cables as short as possible)...then bridge between the inverter and the shorepower cord/bin with an extension cord of the proper gauge. Plug the shorepower cord into the extension cord (with the required adapter blocks as needed for 50amp, 30amp, etc.), turn-on the inverter when desired (be sure to avoid any hot, sharp, or spinning parts when running the extension cord)...viola', off grid 110AC without running the gennie.
This set-up is SO simple. There are no transfer switches that can fail, the RV's electrical system remains unchanged, and it is impossible to run the inverter when on shore power (no waste of the inverter's finite lifespan)
There are 2 things that you will have to remember with these simple set-ups...no AirCon (of course, unless you get a BIG inverter and add lots of batteries) and you should switch off the converter/charger to prevent a loop that discharges the batteries trying to charge them. We just flip the breakers on the main panel for the AirCon and converter/charger.
If you do not want the fridge to run on the inverter, most dual power units have a selector for "Auto" or "Gas" to force it to stay on gas...select Gas.
Kim and Steve, Mustang LCDR (Ret), '07 Damon Outlaw #1193
I have seen gross intolerance shown in support of tolerance, Samuel Coleridge
WE LOVE OUR OUTLAW RV