Charge spare battery
My wife and I both use CPAP machines. When we are at electric sites, no problem. When we do an overnight without hookups, it becomes a problem. The CPAP batteries run over $200 each, so over $400 for ...
Forum Discussion
mobeewan wrote:
I don't really know what the exact efficiencies are one versus the other, but you do lose about 10% going from DC to AC with an inverter. Then with the inverter you going back to DC at 24 volts and there's probably an efficiency loss there. With the rest Med converter you're only making one change from 12 volt to 24 volt so I would think that it would have to be more efficient overall. So far I've only used the CPAP while tent camping at a campground it did not have power and I brought my own 12 volt DC deep cycle batteries. My camping times have been limited to three nights and I've used both the inverter and then later the power adapter when i received it. I've always had power left on the battery with the inverter or the DC converter after three nights and I've used the humidifier every time. Res meds website has a PDF for using power inverters with their equipment you might take a look at it.
I just ordered the 12 to 24 adapters for both my wife and I. Cost was more than I wanted to spend, but hopefully over enough time it will make sense. I did see Resmed's pdf on power inverters, and used it to size the battery I bought.
Thanks again for your help.
