I also recently moved to a Dreamstation from my older model CPAP.  I had a special 12V outlet installed, just to run my CPAP.  Planned on doing the same with the Dreamstation.  However, the power plug on the dreamstation is not the same as the one on my older Series One.  But there is a 12v power cable available for the Dreamstation, and it is available from Respironics or your CPAP provider.  If you need further information, PM me and I can give you the exact part number that you need.  BTW, the power wire that I already have was not long enough to reach, So I just got a length of #16 wire and spliced it in to make it longer. I am still using my older Series One in the MH, but plan on using the Dreamstation there later.  Wired in direct to 12v is by far the best solution, and I can run mine for at least two full nights just on the coach batteries if necessary.