Don't waste your money on a large inverter unless you have a means to recharge it. I bought a refurbished 2500 watt Xantrex (online)and (3) 12volt 8D AGM batteries and boondock. The inverter has a 100 amp charging ability. It takes about an hour to recharge every morning when camping. I use a 2K Honda for the recharging, I use the generator for the Microwave. If you have access to the AC wiring in the RV; install the inverter after the AC, water heater and other high power appliances.
I've been using this setup for over 12 years and the batteries are still holding up. The inverter keeps the batteries charged when parked.
