camping with CPAP (no electric hookup)

Both my wife and I use CPAP machines in our rig and we normally have no hook ups. Many, if not most CPAPs run off 12v and have a transformer built into the cord to reduce the voltage from 120/240 down to what ever voltage the specific CPAP takes. Mine is 12v, so I ordered an adapter cord that goes from a standard 12v outlet(cigarette lighter) to the plug in on the CPAP. The adapter cord came from the CPAP manufacturer and it completely replaced my cord. My brides is a 24v unit and we got a 12v to 24v inverter from the manufacturer of her unit and both work perfectly. Easy as that. I did have to run 12v wire and outlets to each side of the bed so I can plug them in. I suppose if you wanted to you could put in an inverter direct from the batteries and plug your units into that. If you plan on using 110v appliances in your rig when your not hooked up to shore power that may be the best way to go. We don't use any 110v appliances at all when we camp so I have no inverter to plug my CPAPs into. I'm somewhat the minority on this subject as many like to have Mr. Coffee and microwaves etc.