Take a look at Goal Zero. I use their Sherpa 50 power pack and Nomad 20 solar panel along with a Z1 cpap. Add a mask/hose and all together it weighs around 6.5 lbs. Before heading into the field I fully charge the power pack and can get two nights from it. Every day I hook it to the solar panel...
Great bull. I flew out of Tok on Sep 3rd for caribou and griz. I was about 112 miles north of Tok near the base of Mt. Sorenson. Got a nice bull but no griz. 40 Mile is a very professional service. Hope to get back up there in a few years.