I sleep with a CPAP machine as a medical necessity. Can anyone suggest a way to supply it with power indefinitely? It runs on about 120watts x 8 hours per night. It has a DC input, so no inverter loss to worry about. As far as I can tell, I'll be drawing 960 watt hours / night, so I'll need an efficient way to provide that or charge back a battery bank each day. Solar? Wind? any suggestions are welcome.