7w / 12v = 0.58 amps 0.58amps * 2 people = 1.16amps 1.16 amps * 8 hours = ~10 Amp-Hours
10 AH isn't too bad as long as you have a reasonable charging system. Engine or solar. I imagine that if you tried to power them off of their own transformers that 10 AH would go up close to 20 or 30AH with all the losses in the inverter and wall transformer. Josh On Feb 25, 2017 5:14 PM, "Bob Caughran via CnC-List" <cnc-list@cnc-list.com> wrote: > Thanks Josh. I read online where they only draw like 7w if no humidifier. > > Bob > > Sent from my iPhone > > On Feb 25, 2017, at 3:54 PM, Josh Muckley via CnC-List < > cnc-list@cnc-list.com> wrote: > > I believe most CPAP machines run on 12v coming from a wall transformer > (wall wart). It will be most efficient to simply power them straight off > the 12v battery through something like a cigarette lighter plug. > > Josh Muckley > S/V Sea Hawk > 1989 C&C 37+ > Solomons, MD > > On Feb 25, 2017 11:14 AM, "Bob Caughran via CnC-List" < > cnc-list@cnc-list.com> wrote: > >> First let me apologize. I do get carried away writing at times. >> Until Beemer, 29mkII, was moved down to Biloxi 14 months ago, she had >> been a lake boat for ten years, day sailing and spending weekends in the >> marina, racing around the cans. >> Sailing on a friends 48' Tayana occasionally over the last seven years in >> the Gulf spoiled me to the joys of cruising to destinations and point to >> point distance races. Have sailed from Corpus Christi all along the Gulf to >> Key West on that big beautiful yacht. >> I remember the first time I sailed Beemer out into the gulf, out of the >> protection of Deer Island. Single handed, I headed out. The winds were >> 10-12 out of the south in the marina. I threw the 105 on deck and rigged >> the first reef. Figuring I'm by myself, better to be prudent. A little chop >> in the bay as I motored west to open water. Most of you can guess what >> happened when I cleared Deer Island. Yep, bam!! 16-25 knots and 4' seas. >> Of course, Beemer was getting tossed around. Got the main up and the 105 >> and Beemer put her ear down and took off. Dang, she's a good lil boat. >> Since moving her to Biloxi, it's been mostly day sails, occasional >> overnight anchoring on the barrier islands, and tons of working on her, >> setting her up to cruise. >> Next month, my sailing/racing buddy, his wife and myself are heading out >> on a week cruise to Pensacola, 100 miles away. We will do fairly short >> days, 20-40 miles. Stop and enjoy ourselves going and coming. Anchoring >> here, marina there. >> Since most of the time I'm by myself, having to plan all the extra stuff, >> blankets, towels, food for three has been fun. My wife went out and bought >> a new quilt for the v-berth and new towels. Guess my older towels and >> blankets aren't good enough for guests. LOL. They both use CPAP machines >> at night. Still working that electrical requirement. And although his wife >> loves sailing, she is rather frail, so have to really watch weather so not >> to bounce her around too much. We will probably spend a fair bit of time on >> the ICW, at least heading east into the prevailing winds. The return should >> be outside, downwind run. >> Anyways, just thought I'd share my little plan for my first cruise. >> Oh yes, for any of you southerners, I'll always accept suggestions for >> anchorages or marinas between Orange Beach and Ft Walton Beach. That means >> you too Dennis. >> >> Bob Caughran >> Beemer, 29mk2, 309 >> Biloxi, MS >> >> >> >> Sent from my iPad >> >> _______________________________________________ >> >> This list is supported by the generous donations of our members. If you >> wish to make a contribution to offset our costs, please go to: >> https://www.paypal.me/stumurray >> >> All Contributions are greatly appreciated! >> > _______________________________________________ > > This list is supported by the generous donations of our members. If you > wish to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated! > > > _______________________________________________ > > This list is supported by the generous donations of our members. If you > wish to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated! > >
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