Hi I have used a CPAP for 12 years, both on sailing and white water canoe trips.
I own 5 machines, kept in different places and one to travel with. I run one of my CPAPS off 12 v and the draw is reasonable for sail and canoe, however I do consider this to be one that I could walk away from without financial ruin LOL. So far it seems to run fine without a voltage regulator or voltage stabilizer plugged right into a 12 V outlet. My best newest CPAP, my travel techy one is a different story. It is brain and controls are very nice but oh such a techy brain inside. Yes it has a 12V input jack but it came with a huge "brick" to stabilizer and the filter the power. It also draws three times the amps of my older one ... probably lost in the regulator brick. I travel with this one in a waterproof Pelican box. I did take this one on the Chicago Mac a few years ago ... The captain thought that my navigation and storm mast climbing skills were valued enough that he wanted my CPAP to run LOL ... without my CPAP I am a useless vegetable near death ... He decided to run the engine to keep the boat batteries sufficiently charged in order to run my CPAP. I was given another CPAP that was supposed to run on DC power. Right! It does run on DC power but 24V DC! argh Don
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