I'm on the road so I can't give a detailed answer, but Resmed has an online guide for battery sizing.
http://www.resmed.com/us/assets/documents/service_support/battery_guide/198103_battery-guide_glo_eng.pdf Let me know if you need more help and I'll look closer when I hit a motel. I'm familiar with CPAP and Resmed. George D. Nincehelser Sent from my iPhone On Nov 18, 2012, at 10:37 AM, Geary Schindel <gschin...@edwardsaquifer.org> wrote: > Folks, > > Sue and I are heading out camping this Thanksgiving and have a camping/caving > related question for the electronics gurus in the group. Sue has a sleep > apnea machine she uses. We’ve used a marine battery that has worked for as > long as a week without charging. I checked the amp hour rating of the > battery and compared it to the demands of the machine but I’m not sure I got > it right or was just lucky. On this trip, we’re flying out to meet Graham > and Aspen and going camping in Deaf Valley – That’s Death Valley, just > checking to make sure you’re listening. Flying with a 70 pound marine battery > probably isn’t a good idea. Anyway, we were thinking of purchasing a > motorcycle battery from Autozone in a nearby town and was wondering if folks > think the battery would last for three nights without charging. > > We use an inverter connected to the battery to power the machine. The > machine is a Resmed. The specs are AC 100-240V 50-60 hz. 110v 400 hz, 2.5 > a. DC 12 V 2.5 amp. > > I didn’t see the DC connection before so I’m wondering if I can get a 12 volt > DC cord. Anyway, I’m not familiar with motorcycle batteries and don’t know > whether they are 12 v or 6 volt and how many amp hours they are. Anyone have > some suggestions as to what they do. > > Thanks > > Geary, > > P.S. if you’re thinking about breaking into my house and robbing me of my > vintage caving coveralls with real canvas grip patchs (a real collectors > item), we will have a full time housesitter and visiting friend.
