Interesting CPAP Lithium 30 amp hour battery + charger
http://www.ebay.com/itm/12V-30AH-battery-pack-lithium-Portable-emergency-camping-Power-Supply-30000-mAh-/262984164559?hash=item3d3b13e4cf:g:vZAAAOSwPK1ZQcsL
Forum Discussion
According to the hype there is nothing preventing a solar panel from feeding the recharging power. Sounds like it has full cell monitoring and controls.
