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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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If DC paower = no humidifier, as it only blows through it, I'd get a bowl in front of the intake and let it suck through it, seemples, just don't let it suck the actual water into it of course.

Sleep2snore said:

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.

It needs to be either a lot cheaper than that Kath or we're better of using theirs, it is a quite simple bit of kit,, certainly no more complicated than what you would need to power a TV etc, they are just profiteering off gullible people, who can and would go elsewhere except for the propriatory plug, £20 they would sell loads.

Kath Hope said:

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

It is the specially made plugs that beats us from making a power supply with all the protection built in.

Where do you get a plug that looks like that.  If it is a NHS machine you dare not change anything, and if it is one you bought you have warranty issues to worry about.  So ResMed have got you over a barrel, use one of their Dc?DC converters or a power inverter to go from 12Vdc to 240Vac and then back to 24Vdc.  Just seams like a lot of wasted power to me.

Even at £30 they should be making a profit, you could buy the parts to make one in Maplin for £20 and that is expensive way of getting the parts.  But you can't get the power plug for the back of the machine.  They have three pins, why three I do not know yet.  I suspect it is to do with telling the machine to turn off the humidifier and climate line if on battery power.  Whether it does this by putting a voltage on the center pin when on AC or DC I don't know, but the plug is a sticker unless you get a failed power supply.  A circuit diagram of the DC to DC, or even the AC power supply would be a help, but they are never going to let that out or the plugs.  So it looks like we will just have to cough up and smile as it hurts to pay them silly money for a power supply that could be knocked up in a workshop for a lot less.

This might make the manufacturers that make 12Vdc machines get an edge on my ResMed.

Is there any reason why their machines should have to run on 24Vdc?

Even if you drive a lorry which is 24Vdc, you still have to buy their adapter just so you can connect the machine direct to battery power. 

There is a guy on YouTube who would suss it out, but you'd need to send him one to test, Bigclive.com he doesn't like stupid electric systems regardless of voltage.


He takes things to bits so you don't have to.

But I need my power supply, so it will have to wait.

It's the plug that is the problem, not the connections as such.

Would soon work that out if I could get hold of a plug, it appears to be specially made just for ResMed.

I have seen some odd plugs in my time, but never one like this.

It is just to stop people making their own power supplies.

To see what the difference between the Mains power supply plug and the DC/DC one, I would need to buy a DC/DC power supply.  No doubt the Chinese will have a cheaper version on sale, chop the plug off and put a good DC/DC supply on it, but by the time you did that, you would be just as well buy the original.  Then if it goes faulty, you will at least have a plug for a home made supply.

tis all a plot to make us poorer and them richer.

Merry Christmas to all.


I am quite sure they could make these and sell them for £25 and still make a small profit, and also build up their customer support and get a bit of loyalty from their customers.

Though in this country most machines are obtained through the NHS, but that is no excuse for them to charge big money for what is a not expensive item to make.

It is only the plug that goes into the machine that stops me from making one.

Or will it!  I want to use it on 12Vdc later this year, but I am NOT going to pay their prices, nor am I going to buy a cheap Chinese copy.  Hummmm, they would have a cheap Chinese plug on it though 

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