I use a cpap in a semi truck sleeper on
12v all the time
As of Feb 2015 resmed doesn't have a 12v power supply for the s10 yet. That is a good reason to get the older s9. Phillips has good cpap too.
Ditto what archangel posted. While expensive the resmed power brick saves on battery drain. Converting 12v to 110v you lose efficiency at the inverter
Heated humidification takes lots of power. 185 watts max with blower and humidifier. I've got huge batteries on the semi and they won't run cpap with humidification for 8 hrs.
Look at a portable cpap like Transcend or Z1. I have a transcend as a backup. It's got a solar power option for charging batteries.
Instead of heated humidification look at nasal irrigation. You rinse your sinuses with sterile saline solution. Sounds gross but feels good. Neil med makes prepackaged spray bottle stuff that works for me in the truck without a good source for water.
You are going to run into some issues getting started on cpap. Plan ahead and don't be afraid to ask questions.
(Just a truck driver with sleep apnea )
I am hoping I won't need humidification on the boat due to warm temps and already high humidity. If the numbers from the Resmed chart are correct the power side should be no problem. We have 1250 Ah of AGMS onboard and an excess of solar, at least at the equator where we tend to hang out.
We have plenty of water onboard, (desal/RO) but I'll look into the spray.
I thought maybe I'd look at something like the Transend as a backup. Thought I'd check out the #2 on the Suppliers list and see what they have in slightly used.
Everything is on order. The only thing I'm a little concerned about is making sure the mask situation is resolved in the short time before I depart. We'll see. Got a couple different ones coming to try.