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Jeepinator View Drop Down
Groupie
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Joined: 08 Sep 2017
Location: Seacoast NH
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Direct Link To This Post Topic: CPAP
    Posted: 05 May 2019 at 1:27pm
Offgrid is correct. I have the same cPap and that is what I used. I installed a cigarette lighter outlet on the panel under the bed. You may want to upgrade to better batteries though; you don’t want the battery(s) to discharge less than 50%. You’ll also want to shut off the humidifier. It’s a major power hog. 

2018 Jeep Wrangler Willys
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Joined: 30 Jul 2016
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Direct Link To This Post Posted: 02 May 2019 at 4:00pm
Check a site called cpap.com.  Back in 2016 I purchased a "DC Converter 24V 90 Watt for S9 Machines" to power my S9 ResMed CPAP unit.  The converter package included a cigarette lighter plug, the converter brick, and wires to connect the brick to the CPAP machine.  The package also provides wires with alligator clips if you want to go directly from a battery.  The unit cost $84.95 at that time.  Also check www.cpap.com/productpage/dc-conveter-for-s9-machines.html  which provides detailed information with regard to current draw at 12v DC, battery amp-hour requirements for different treatment pressures and a lot of other good information.  The unit has worked very well for me.  The 800 number for cpap.com (at least in 2016) is 800-356-5221.  I would guess they make converters for many ResMed series machines.  Good Luck.
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Direct Link To This Post Posted: 01 May 2019 at 8:09am
Thanks!
Julie
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Direct Link To This Post Posted: 01 May 2019 at 5:22am
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Direct Link To This Post Posted: 30 Apr 2019 at 8:13pm
Okay, I did a real quick web search. Your Resmed Airsense 10 runs on 24V. https://www.resmed.com/uk/en/consumer/products/accessories/air-10-dc-dc-converter.html

You would need to get a 12V to 24V converter. You could check Amazon for this item.
StephenH
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Direct Link To This Post Posted: 30 Apr 2019 at 7:59pm
Thanks Stephen, Its a Resmed Airsense 10 but I don't have (or have access to the other information).  I've read that some need inverters and others either already have them or don't need them.  I suspect this is the problem and I think what we'll try next.  :)

I think its not a fuse because it can work on the cpap battery but not on either car. We also have this weird cord that has a 12 volt socket on one end and little clips like jumper cables on the other.  I think that can connect directly to one of the camper batteries but we'd have to slam the door on the cord.  

how fun is all this?LOL
Julie
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Direct Link To This Post Posted: 30 Apr 2019 at 7:49pm
It would help if you mention the brand and model of the CPAP machine. Mine is a Respironics System One. I purchased the 12V power cord made for this model. It was much more expensive than a generic 12V cord but it works fine plugged into the 12V outlets I installed. One way to make sure you know the power requirements of your CPAP machine is to look at the transformer block. Look at the output voltage. Is it 12V or 24V?
StephenH
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ouR escaPOD mods
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Direct Link To This Post Posted: 30 Apr 2019 at 3:34pm
Was the DC cord designed for the CPAP? If not, it may have the wrong polarity in the connector, which I assume is a typical DC barrel connector. Another possibility with an aftermarket cord is that the CPAP runs on 24V and the straight DC cord isn't providing enough voltage, i.e. it needs a voltage step-up circuit.
Alan
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Direct Link To This Post Posted: 30 Apr 2019 at 3:33pm
Thanks so much...the car was tried both running and not running but I will look for a fuse.  :)
Julie
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Direct Link To This Post Posted: 30 Apr 2019 at 2:41pm
Echo, another possible problem is if you had the motor running, you could have created enough line noise for your CPAP that it wouldn't run.  I saw this happen to one where I fixed the reversed polarity of the plug and it ran fine, but when my friend tried to run it with the generator to his RV going, the CPAP refused to run until he turned off the generator.  .... and returned us camping near him to blissful peace and quiet.  Clap
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