Be aware that many of the threads on hee are older, and that there have been vast improvements in CPCP machines in the past few years. Most not are designed to run on 12v, usually with an adapter for convert from 110V. Also, the new machines do not require near the amperage that they used to. I have used mine on 12v for over 10 years now with no problems, and have had 12v outlets installed with dedicated wiring and fuses for the CPAP. Untill he get home, a 12v outlet attached to a couple of alligator clips to attach to the battery, and maybe a 12v extension cord will work. Both usually available at better auto parts stores. Check out some ot the other threads for other wiring advice.