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You can get a 12v lead for some models of machine, otherwise consider buying an inverter, although if the breathing probelm is severe, then personally i wouldnt risk using a supply that is likely to fail whilst he may be sleeping, its just not worth the risk to his health.

Julia  

Hi Pally, I don't think they draw much current especially the new slow start ones that ramp up. Have a word with the technician who services it at your local Department of Respiritory Medcine. You also need to know the polarity of the 12volt connector plug (whether the inside is + and the outer is - , or vice versa)

Dave