lfhoward wrote:Since this seems to be a CPAP thread, I will chime in too. 156Ah LiFePO4 battery (soon to be 246 with the addition of a second 90Ah battery). My ResMed unit is 24 volt and runs at about 65 watts (about 5 amps at 13.2V) on its 120VAC power brick. I have an inverter that can run it easily, but I am wondering if anyone has any solutions for converting 12 to 24 volts to run a CPAP? There is no car charger for my unit because of the voltage difference. I know DC-DC converters exist, but would they be any more efficient than my Victron Phoenix inverter? I like the idea of getting a non heated hose to save power while camping.
That's interesting. I had the DreamStation for just about 5 years until they had the recall. At 5 years old, they refurbished the CPAP for me so it's like new again with no issues. My next CPAP that I got this past summer was the ResMed AirSense 11 which I love. It's the same as yours 24v but since my older DreamStation was rebuilt, I just use it solely for camping with the 12v adapter cord. I don't have a clue on how you could run the 24v on a 12v system other then going thru a 120v convertor. Have you tried contacting ResMed directly about this..?
The ResMed Technical Care Team can be reached at 1 (800) 424-0737