We survive for two to three days with 4 batteries when boondocking. We are gourmet cooks and use a variety of cooking appliances including electric BBQ grills, convection oven, Kitchenaid mixer...etc. Our microwwave is a 1200 watt; I don't know the amps.
I didn't worry about the power we use, I just went with 4 batteries because that's what everyone else seemed to be using at the time 20 years ago when we setup our 5th whell. Two batteries supply power to the normal 12v stuff and the other two provide power to the inverter. I can kick in all 4 batteries if needed through the remote control panel for the inverter.
I also carry one or two 2000i Honda generators to use for charging the batteries, running the air conditioner (using the 2 generators) or if we need to run several hi-draw appliances at the same time. Like for Thanksgiving Dinner.
