I found this on Amazon. Rockpals 300W portable generator. 280 Watt-hours and only 7 lb. Great reviews. I ran my Phillips Respironics CPAP for 4 nights in a row on a single charge, using the 12V outlet. I also picked up a foldable solar panel charger for it. I plan to use this for tent camping at Oshkosh this year for CPAP, charging devices and running a small fan.