I think I'd be working on ways to run the C-Pap off batteries. A Champion generator running all night is a prescription for poor sleep for yourself and a lot of animosity from anybody within a mile or so. Those things are noisy, especially in the silence of darkness.
I didn't think C-Paps drew enough power to require a genny.
According to this: http://www.apneaboard.com/forums/Thread-Equipment-How-many-DC-Amps-does-my-CPAP-REALLY-draw you should have no reason to run a generator. 5 amps at 12 volts is only 60 watts, and running even the smallest generator, a 900 or 1,000 watt unit, would be overkill. If you have one of the 1 to 2 amp C-Pap machines, it'd be like hookin' up a nuclear air craft carrier to tow your canoe.
