PDX1953

Hi -

I've used a CPAP & then a BiPap since 1995. Up until I got my Airsense 10 a few months ago they've always used a 12v power supply although the end on the cord is unique to the machine (i.e., can't use a laptop power supply). My Airsense 10 with heated humidifier is the only 24v machine I've had and I'd like to create a cable so I can use (2) 12v AGM batteries in my new travel trailer. The travel battery packages are ridiculous - over $300 - and a 12v to 24v cigarette lighter adapter is nearly $100.

Has anyone else dealt with this? On the low voltage side of the OEM adapter there are three wires - white, black & an uninsulated wire. It's pretty much impossible to measure the voltage on the tiny little center probe but there has to be some way of determining how the 24v is supplied. With a 2-wire plug I'd just wire two 12v batteries in series to get the 24v but with 3 wires apparently 2 of them are providing 12v each & the other is neutral.

Anyone else dealt with this?