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Re: Inexpensive DC Power for CPAP


Posted by W6SA on October 25, 1999 at 13:02:53:

In Reply to: Re: Inexpensive DC Power for CPAP posted by pat on October 25, 1999 at 11:26:31:

Pat,

Thanks for your comments. The DC cord comes with a replaceable 2 Amp fuse inside the plug. As far as AC chokes; I don't know where the induced AC currents would come from unless you were running your car engine and your alternator gave you some spikes. If anyone is considering sleeping in their vehicle with the engine running I advise against it. It could be a ver-r-r-y long sleep.

Chokes as you apparently are aware resist a change in current. I guess there could be a spike at start up and shut down of your unit but this should not induce any AC current. You will get a spike when you start on AC current also. I have not torn the CPAP apart to see how it is wired. I assume that it has a 12 VDC motor in it which is powered through an internal 12VDC power supply after stepping down and rectifying the 120 VAC source. Perhaps there are chokes in the unit also.
I guess I'll just have to take my chances for now.

I was going to mention marine batteries as that is definitely the way to go if you are expecting to utilize them on a regular basis with the possibility of deep discharge. I was aiming more towards an emergency situation rather than someone who would rely on batteries for a daily power source. A well maintained marine battery can give you many years of service if it is not abused.

If anyone has further information on the need for chokes I would be interested in hearing about it.

Walt

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