(06-08-2013, 11:01 PM)Labrat0116 Wrote: Is 35-45 AH for any PAP machine for (3) days run time ?
Would a Marine deep cycle battery and a 400 Watt Inverter do the job ?
I can't answer your question about run time. It depends on a lot of factors, the biggest one being the heated humidifier and hose.
But since you have a Respironics machine you don't need the inverter. Respironics machines run native on 12 volts DC, which is exactly what a lead acid battery delivers.
The only way to increase run time beyond that is having extra batteries or a solar charger. I plan to have two car batteries for extended outages so I can switch them back and forth between the car and the CPAP machine. Just make sure I have a full tank of gas in the car and I should be good for a couple weeks or so.
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