I am guessing the CPAP is a 110 volt unit?
If so, why not get a small inverter that will provide 110V from the RV batteries?
If the RV batteries need a charge and you are dry camping, a solar panel might be all that you need, depending on load, to keep the batteries charged.
-Brian
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2014 Bullet Premier 22RBPR - let the camping commence!
2013 F150 Platinum - 5.0 - 3.55 ELD + towing package
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