1. ResMed sells a battery unit that may actually power the Elite S5 for as much as 12 hours at the setting I use - but they hedge this info based on how old the batteries are, how cold it might be, pressure setting, etc. This ResMed solution is well into $720 bucks (expensive because it probably uses Lithium batteries (made in China and of flakey quality? ) Quality may actually be pretty good since much of the ResMed stuff seems to be made in Germany.
2. So if I get this unit - then I have to either do a lot of driving the next day and have my car's alternator recharge it (if, in fact, this can be done on this Lithium battery set) --- or go somewhere where I can plug it into 120 V-AC for two hours. Can't imagine spending two hours every morning drinking coffee at McDonalds or a Starbucks like joint while all of this stuff recharges.
3. So then what about solar recharging?? A solar panel of some as yet undetermined size and cost, attached to the roof of the Outback - now it could be charged every day whether I am driving or not. (obviously if there is no sun all day, that then gives me the opportunity to stay overnight in a motel or ridiculously priced KOA like place with power (for a tent sit, min. $35, often includes 120 V outlet, maybe).
4. I could also use a Converter (a device that will use the power of my car's battery (12V DC) and convert it to the 24V and Alternating (AC) current that the CPAP machine uses. Now I am putting my car battery at threat. Might work fine but it could also leave me with no battery power to start the car waaaay out in the boonies.
5. Guess I could then get one of those separate devices that has enough umph to electrically jump start the car (providing it's not too cold) and also pump up a tire should I need that. The converter (ResMed) above costs $80 bucks or so. Ditto one of those auxiliary jump start devices/tire pump.
Soooo. Anyone have experience in solving some/all the issues I have presented or can offer some solutions, advice, etc. Clearly I have not done this before though have tent camped before but never this the encumbrances of the CPAP. Anyone seen any ideas about building their own battery/converter device??? Certainly one could be built for well under the $700+ (or am I being naive), Ditto the Converter and/or Solar array.
Lots of questions here. Please, don't be daunted - I certainly don't expect someone to be able or have the time to answer them all, but any help, no matter how little, would be helpful.
John Grimes, email@example.com 703-690-1942, Northern Virginia.[/font][/size]