you should certainly have LIGHTS, they run off 12v regardless of what 'power source' you are/ or are not/ on... they use the batteries.
Air Conditioners, water heaters(electric mode), etc., aren't going to operate without the generator since they require too much amperage - the Inverter is designed to power 120v outlets and appliances that require lower power draws.
'Sometimes' larger coaches, mostly diesel models, will have all Outlets run off the Inverter, but most smaller and gas coaches do not, they are limited by the size of the Inverter, usually mainly for the residential fridge only, but sometimes another outlet and/or TV outlets.
If you want to buy an RV with 16 batteries, a 6,000w Inverter, you may be able to power an Air Conditioner, but that's quite uncommon, no matter the largest coach built.
Let the generator run off your AGS(auto gen starter), if you have one, and it can serve you well. It can even be set up to start the generator automatically when you air conditioners need to come on, or when the batteries need recharging : )
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the Turners...
two Campers, two Electric cars
former diesel pusher traveler
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