the 3500w, should run your A/C
but a few conditions need to be meet first
#run it before you need the A/C..bring up the charge on your batteries so the converter is NOT pulling a heavy load
# make sure the fridge and water heater are set ON LP aka propane..NOT on automatic and using the generator
# if you need the MW, hair dryer, coffee pot, but the A/C on FAN ONLY
even if you get a bigger inverter, you don't have enough battery to use the inverter for heavy wattage items
microwaving supper could ruin your evening entertainment and or forced air furnace heat use