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Can anyone suggest where I might find a realistically priced adaptor, as I don't want to use an inverter.

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They have got you over a barrel with that one.

I take it you have a ResMed machine?

The price they charge for their dc/dc adapters is ridicules, well over £100

You could easily make one to do the job or get someone to do this for you, or even buy one and out it in a box, but here comes the crunch!

You need a special plug to go into the machine and this is what gets you.

I have not looked into this plug yet and I don't know why it is shaped the way it is.

I am a bit cynical and think this is just to stop you making your own adapter.

The plug has an inner and an outer power plug, but if you study the one that comes with the machine, it also has a third pin in the middle,  This put an end to making your own adapter (until it gets sussed out) and that is just the manufacturer ResMed trying to stop you making something yourself, of course it is a good money earner!  

If you have some Phillips machines, the good news is you do not need the adapter as a lot run on 12Vdc, but you have to be careful or the polarity as they use strange pin connections.

I wish I could get hold of a plug that ResMed make, I would make my own power supply, or get one off the Internet and adapt it, but the plug I have never seen before.  If I could get hold of one off a power supply that is knackered, I could do that and work out how it works, but I am not about to play about with the power supply for my machine.

It might be easier if you don't want to pay for an adapter to get a mobile machine, these are expensive, but you would have one ready to go and they work off 12Vdc, however, they do not have humidification (one has a filter that traps moisture from your breath and recycles it) and they do tend to be a bit noisy.

If you go camping or use a motor-home you need to keep and eye the battery drain if you want it to start in the morning.

If you have a caravan or motor-home you can hook up to the mains.

I wish there was a good cheap power supply on the market, but I don't know of one and if it was made in some back shop factory in China I would avoid it anyway.

I am also looking for one for a ResMed machine at a reasonable price, so if you or anyone else knows of one please let me know.


I see you are looking to use it in a caravan, if you hook up to the mains anyway, you can use the power supply that came with it.  If you want to use the caravan battery you will have to get an adapter, the battery should last three nights, but that will depend on the size of it and what other things you run.  You can cut down on power consumption from the battery by changing lights to LED types, brighter and a lot less power.

If you have a small inverter I would just use that to get 240Vac and use the power supply that came with it, but do not use an inverter that is to big as it itself uses power to convert 12Vdc to 240Vac and it will drain the battery quite quickly.

I have no idea why it says caravan, when it's a Motorhome I have, brain fart possibly.

Got this link from Resmed, still a silly price though.



I suppose I could fit a 12v ciggy socket near where I sleep, and plug in one of those coke can type inverters, but as it will be running a motor, would it not need to be pure sine wave.

£65 all in, that is on the steep side, but better than any price I have come across.

The data label on my Resmed Autosense 10, which you might notice is made in China.

And I thought perhaps this inverter, https://www.ebay.co.uk/itm/200W-Pure-Sine-Wave-Car-Power-Inverter-D... a good solution, until I saw the 1 month warranty.

Not found anything else, please link if you have.

I'm not good with how this would affect my 110ah Leisure battery, we wild camp always and tend to move each day, we have a 100w solar panel too.

Yes, made in China, what isn't these days, however, it is fine if made for a company like that to a standard.  However, there is no guarantee that one made and sold on Ebay or Amazon will be made to anything like the same standards.  If you are on the road every day I wouldn't worry to much, best thing would be to try it for a night just to see how discharged your battery gets, the adapter is supposed to cut out if the voltage gets to low, I would think most power supplies would do the same.  That does not help if you are half way through the night and it cuts out.  A solar panel will help keep it charged, but you will have a bit of a drain, but no idea how it will affect your battery.  I gave up caravaning a while ago, but I used power hook up, so it was not a problem.  It may be a problem in the summer this year though as I intend getting out, so I will have the same problem.  Do I get the adapter or do I get an inverter that can be used for other things as well.  Though what am I going to need that I can't get off 12Vdc?  Not a lot, rest will be gas.

There is a formula that you can use to work out how much power you will need from an inverter.

Thanks, the last twice I've been away, I left the machine at home, I felt fine, I don't think I have as many incidents as some.

I recently bought a blood oxygen meter to try monitoring while on the CPAP, and also when not to see if there was much difference, it is one which can be read by Sleepyhead software, I've just not got my head around it yet.


Could you post that formula please.


This 3 part plug, have you put a meter on it to see what if anything the three contacts produce yet when plugged into the mains, I just tried with my meter, and the damned battery is flat, forgot to turn it off.

No, the meter is in the shed built in for now.

It is an odd plug, otherwise you could build your own power supply.

I think this is a special made plug just for ResMed machines.

I have never seen one before anyway!

I was wondering if the central pin was a dummy, not a electronics wizard, so not sure how a + & - would work anyway.

I think it has to be a inverter or bite the damned bullet and get the insanely priced adaptor, and as I'm from Yorkshire neither option has much appeal 

I am the same, do you convert power twice at a cost to power, or do you get the dc/dc adapter and save on power.  The power adapter can protect against reversed polarity and cut off the power if the voltage in the battery gets to low.  It is just so expensive for what it is.  Only thing about an inverter is you can run small 240cAC things and charge other batteries while on the road, but the argument is that you can do most of this via the cigarette lighter socket anyway.

It is an odd shaped plug, I found a meter in the house, guess what, the battery was flat and I would have to go get another one and they are the pp3 overpriced batteries   So I am still none the wiser what comes in the three connectors on the power plug for the machine.  There are two outer power connectors (or is one a dummy?) and a thin center pin.  Just thinking aloud, but is the center pin used to control whether the humidifier runs or not, I think I read somewhere that the humidifier does not work if on DC, so if that were the case and you need humidity, the inverter might be the better option.  I was going to ask ResMed if this was the case, but I will forget to email them as I have someone coming to see me in a few minutes. 

ResMed mySleep Team

Tel – 0800 9177071

Fax – 01235 861288


If you choose to ask them the question.  I will when I remember at some point.  They do reply to all email I have sent them, so far anyway.  It may be worth contacting them and asking the questions you have before making your derision.  If the humidifier does not work when using their adapter them it would have to be the power inverter for me as I would need humidity.  The center pin might be just slightly shorter in the adapter plug so as humidifier does not run to save on battery power.  I would also ask them what sore of power inverter they recommend, sine or modified wave.

It would be interesting to see what they say.  They said here at a conference I was at that it had to be a sine wave, but in America they have said a modified inverter is fine?  Bit strange, or was it the person at the conference didn't have the proper information with him.

If you do email them, I would be interested as would some others as to what they have to say.

That's my visitor here so have to go.

I'm no expert or power solutions, but do have a motorhome and we had a socket installed next to the bed and just use the hook up.  If you want to go off-course which we haven't done yet as still new to the motorhome, check out the Tracer batteries https://www.tracerpower.com/tracer-lithium-polymer-battery-packs.html

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