Cpap and 12v power

[SheikhLala]

So following on from previous comments on another thread, I did the maths and bought the Resmed 12v adaptor. I have 2 x 12v fag lighter sockets, 1 in the kitchen and 1 next to the wc ( really not the best place to put electrics surely? ) both will run a phone charger but neither will run the power adaptor.
Not understanding life, let alone electric stuff, can anyone suggest what I might need to look at or do?

Confused of Colchester

 

[WillH]

A Cpap power supply can use between 2.5A and 5A, that's a lot for a 12v socket. Better off just using the brick on mains supply. For comparison a phone charges at about 1A.

 

[SheikhLala]

A Cpap power supply can use between 2.5A and 5A, that's a lot for a 12v socket. Better off just using the brick on mains supply. For comparison a phone charges at about 1A.

Thank you

 

[Neckender]

I had a dedicated 12 volt 10 amp supply fitted in the rear of our VW T6.1 for my CPAP machine and it works just fine off 12 volt. I also fitted the same in my last 2 motorhomes with no problems.

John.

 

[pappajohn]

I don't see why it won't work.
If a dedicated supply is rated at 10 amps and works then a cig lighter socket should work.
Cig lighter sockets are rated at 10amp (120w) or 15amps (180w)

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[tonka]

I know nothing about CPAP but after a quick google it seems they can run anywhere from 60-100watts.
As the two replies state, most 12v cigarette sockets are usually rated at 120 or 150w so should run it ok.
Maybe look at making a direct feed from the battery and into a new 12v socket, fused with appropriate cable.
If there is still issues check the batteries.

 

[rb62]

I ran a dedicated fused socket direct from the battery in our last two vans,S8 and S9 but no humidifier,no problems.

 

[SheikhLala]

This is from the booklet that came with it, so should work?

 

[Neckender]

Have you checked that the fuse hasn’t blown In 12 volt adapter.

John

 

[autorouter]

From the data in the picture, I'd say the CPAP unit works at a steady state of 7.5A (2 x 3.75A) and it has a startup current of 13A. That is not unreasonable for a cigarette-lighter socket to provide. However it's possible that the existing sockets are not really up to it, perhaps with a maximum limit of 8A or even less.

You could install a new socket, with nice thick wires and a 20A fuse, going direct to the leisure battery. I'm sure that will solve your problem and be an investment for the future. It's sure to come in handy for lots of other uses too. Like running an tyre inflater pump to top up the tyres. I have over a dozen of these sockets all around the MH, including in the garage at the back.

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[Red Sonja]

I have a CPAP machine and run it off a cigarette lighter socket in the back of the van. I use a resmed 12volt cigarette lighter adaptor ( wasnt cheap £90 5 years ago) and also an extension lead (12 volt cigarette lighter type) as the plug is too far for my machine to reach.

This has worked absolutely fine for the last 5 years.

Sonja

 

[Lenny HB]

Probably not working due volt drop due to the cable to the socket being under size. Rewire the socket with heavier cable and I would change the socket and the plug on the device for a a Hella plug & socket, cigar lighter sockets often have a poor connection and not much good for high currents.

Cable size calculator on this page aim for less than 3% volt drop.

Cable Size Calculator - Cable sizing and selection | 12 Volt Planet

Cable Size Calculator - Read our guide to selecting cable of the correct type and size for your automotive, marine or leisure wiring application. Auto and Marine Electrical Components from 12 Volt Planet

www.12voltplanet.co.uk

 

[Red Sonja]

Probably not working due volt drop due to the cable to the socket being under size. Rewire the socket with heavier cable and I would change the socket and the plug on the device for a a Hella plug & socket, cigar lighter sockets often have a poor connection and not much good for high currents.

Cable size calculator on this page aim for less than 3% volt drop.

Cable Size Calculator - Cable sizing and selection | 12 Volt Planet

Cable Size Calculator - Read our guide to selecting cable of the correct type and size for your automotive, marine or leisure wiring application. Auto and Marine Electrical Components from 12 Volt Planet

www.12voltplanet.co.uk

Forgot to mention ours is a hella socket.

 

[Tombola]

This one works a treat for my wife's dreamstation CPAP via 12vsocket

Amazon product ASIN B07VY92ZP5

 

[scotzsue]

John runs his through a cigarette lighter type socket, proper resmed cable, recently had a problem but was prtly because extension lead fuse was borderline ok (he had used it for several years) it also shorted out that light systwm which knocked out our truma heating, no idea why they are on the same master fuse, all sorted now and seems to be working fine. He has been using CPAP in the motorhome since we got our first in 2009, first time we have hd a problem although he has also, in the past, used an inverter. We can do several nights off grid, have 1 leisure battery and 180W of solar.

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