Well I don't have a generator but I do use a power inverter that is hooked to a marine battery at all times. My battery is always being charged by a trickle charger and my inverter is hooked on that. My air supply is plugged into the inverter so when or if I lose power my air supply will never go out. My battery will keep my tanks going for 6 to 8 hours before I lose all of my charge. This is very quiet and you can't even hear it running. This is my backup system without spending a lot of money.