Many CPAP users use an INVERTER setup and run from the trailer battery. I thought most CPAP machines also ran off of 12VDC (Dual Voltage models)...
The idea is to run off the battery in the evenings and then run your generator the next day to recharge your batteries back up...
That is the way we camp off the power grid... Works out great for us as most places we camp at here on the East side of the US usually have generator run time restrictions. Running things off the battery banks solves that problem for us and then re-charge the next day when allowed to run the generator...
Roy Ken
