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Old 06-15-2020, 08:24 AM   #1
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12v splice into bedroom light for CPAP???

Hey all,


So I can't find any 12v outlets in the bedroom of my 2007 Coachman Mirada. I've been watching lots of YouTube video about splicing into an existing 12V circuit and adding a 12V socket but they mostly say they are to power small fans or for the USB plugs.


Is it possible to power a CPAP if I splice into the wiring for the 12V lights in the bedroom? I guess I'm worried about the wire gauge and overheating and I haven't yet checked the wire gauge on those lights.


Anyone have experience with this?


Thanks!


Mike
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Old 06-15-2020, 09:08 AM   #2
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Mike, are you sure your CPAP will operate on 12VDC?
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Old 06-15-2020, 09:30 AM   #3
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Originally Posted by MSHappyCampers View Post
Mike, are you sure your CPAP will operate on 12VDC?

Yep there's an adapter for it


https://www.thecpapshop.com/dc-power...ense-10-series
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Old 06-15-2020, 09:34 AM   #4
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That adapter is probably 90 watts., which is about 7 1/2 amps. If your lighting is incandescent, switch to LED... you'll have plenty of capacity on that circuit.
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Old 06-15-2020, 09:45 AM   #5
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That adapter is probably 90 watts., which is about 7 1/2 amps. If your lighting is incandescent, switch to LED... you'll have plenty of capacity on that circuit.

yep the light is incandescent... with that in mind I'm assuming the wire gauge has to be large enough to handle an incandescent bulb so should be good enough for a cpap?
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Old 06-15-2020, 10:09 AM   #6
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In the mods I did to my RV. I saw no difference in wire gauge from lighting or the vent fans or the 12 volt outlets that came in my RV.
Limiting factor I see are the fuse sizes.
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Old 06-15-2020, 12:08 PM   #7
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Two 1041 bulbs is about 3 amps. You could always pull the fixture down and switch out and see what gauge wire is in there. From there you can decide if between the light and other equipment on that circuit if it will support another 7-8A.


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Old 06-15-2020, 03:56 PM   #8
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My DW and I both use CPAP's that use a transformer to reduce 120v AC 12v dc. The CPAP actually runs off of 12v dc. I tapped into the bedroom slide wiring and put a 12v outlet on each side of the bed through the bed frame work where it won't be affected by the slide coming in or out. I made a couple cords with a 12v power plug and the appropriate plug to fit the CPAP. This way I dropped the transformer and associated wiring completely. The slide motor will draw many more amps than a CPAP but still be protected by a fuse. The 12v power plug is also fuse protected.



She recently got a different CPAP that requires a 24v dc input at 3.5amps. It came with a 90 watt transformer. Still have to figure out a way to run this without 120v AC.
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Old 06-15-2020, 04:10 PM   #9
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Originally Posted by Mageksl View Post
My DW and I both use CPAP's that use a transformer to reduce 120v AC 12v dc. The CPAP actually runs off of 12v dc. I tapped into the bedroom slide wiring and put a 12v outlet on each side of the bed through the bed frame work where it won't be affected by the slide coming in or out. I made a couple cords with a 12v power plug and the appropriate plug to fit the CPAP. This way I dropped the transformer and associated wiring completely. The slide motor will draw many more amps than a CPAP but still be protected by a fuse. The 12v power plug is also fuse protected.



She recently got a different CPAP that requires a 24v dc input at 3.5amps. It came with a 90 watt transformer. Still have to figure out a way to run this without 120v AC.

My ResMed Airsense is 24v... ResMed makes a 24v to 12v converter but it's in the $80 - $100 range.
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