A well designed trompe could suply air at the needed pressure with only a few feet of head. http://en.wikipedia.org/wiki/Trompe Considering the progress being made with solar cells, the real issue here is political: CPAP machines are regulated as medical devices. If that were not an issue, a truly f...

Compressed air is a viable means of storing energy, as an alternative to batteries: http://en.wikipedia.org/wiki/Compressed_air_energy_storage You don't need a turbine generator to run an electric blower, or any moving parts at all: https://www.gyroscope.com/d.asp?product=AIRAMPLIFIER Regarding feed...