Inverter choice

Markd said:
I noticed that my Phillips CPAP actually runs on a 12v dc output from its mains transformer.
So I got a suitable power lead (HP computer) free from a repair shop attatched a cigarette lighter type plug and run it out of a dedicated socket by my berth.
So no power losses going up to 240 and then back down to 12v.
I don't think that the consumption is as great as op fears.
Click to expand...
I think @wildebus is probably right about the need for a regulated supply. The Philips Respironics 12v power pack has a 12v in from a car adapter and a separate 12v out to the cpap, which suggests the 12v out is properly regulated. I wouldn’t risk it, having a cpap machine turn off unexpectedly in the night can be an unpleasant experience and if you are away on holiday you could be left without a machine for the duration.

I have a Resmed machine that logs a lot of sleep data, which is downloaded every time I visit the clinic. I think it quite likely that the modern machines, which are very reliable medical equipment, also have fault diagnostics logged.
 
I take the point about stabilised supply.
I only use my CPAP when I'm asleep rather than when I'm driving.
So I don't worry about high voltages from an alternator and you don't get more stable than a pure dc supply from a battery.
I suppose I could ask my sleep clinic for a 12v supply when I'm next in if it lasts that long!
 
Exwindsurfer said:
Can I ask what dvla had to say about your sleep apnea.I just sent my licence off for renewal and am waiting to see what they say thanks.
Click to expand...
The letter I have from the hospital says " dvla do not need to be informed as yet but insurance must be notified " I think as the test results downloaded from the machine over my test week show that the treatment has worked I don't need to tell them but if in the future test results show otherwise they will have to be informed, a mate of mine is a bus driver , diagnosed by gp and license suspended immediately, but the minute they put him on a cpap machine he was allowed his license back and reinstated at work straight away !
 
scoobydiver said:
Have just looked at this and it says it's a step down transformer , 24v down to 12v but I'm certain their will be a similar step up transformer available somewhere so I'll have a look thanks !
Click to expand...
I use this device for my Echo - https://amzn.to/2WXYfVT
Have it setup to deliver 15V precisely. It can go up to 30V.
Goes upto 4A (120W) - is that sufficient though?
 
scoobydiver said:
Have just looked at this and it says it's a step down transformer , 24v down to 12v but I'm certain their will be a similar step up transformer available somewhere so I'll have a look thanks !
Click to expand...
Yes it’s just how it’s worded, if you read it all you can see you can set it to go up or down on inlet and outlet sides. I got it for a stable 12 or 15v depending what I connect. There are lots of others but I liked the looks of this one :)
 
Okta said:
DVLA must be notified of sleep apnoea for any type of driving license (not just C1).
Click to expand...
This is a simplification - you only have to notify DVLA if you have sleep Apnoea withDaytime Drowsiness.
The key is what your specialist says - if the medic says notify then you must, or risk breaking law and invalidating your insurance.
Whatever you do, write to DVLA rather than phone, email or e-form and only provide minimum information along with the statement that your doctor says you can drive.
That way you won't get licence suspended thro rushed misunderstanding or wrong box ticked.
 
Last edited:
You must log in or register to reply here.

Users who viewed this discussion (Total:0)

Back
Top