About 3 months in ...

Hey everybody, i'm about 3 months in to this therapy now... still having problems with the nasal congestion. When i do get a good nights rest on the mask, I feel better and more energized. I took my machine for a camping trip a few weeks ago in the motorhome, but the new battery bank I had wouldn't handle the inverter for me to sleep out in the boonies. I'm curious as to which CPAP machine are more energy economical. I've got a fisher and paykel and it doesn't seem very good on a 12 volt battery bank with ann inverter....