QuickerTek (http://www.quickertek.com/) has expanded its solar chargers to include the 11-inch and 13-inch MacBook Airs.
The Apple Juicz now powers all MacBook and MacBook Pro models as well as all MacBook Air. The charger comes with all needed cables; it folds into a transportable size, yet unfolds to gather maximum sunlight to power the MacBook.
A 27-watt Apple Juicz Solar Charger (US$700) is sufficient for many users to charge the MacBook and MacBook Air. However, for those customers that need faster charging with more power, the 55 watt version is also available for $1,200. The 55 watt version uses more solar panels (larger when unfolded) to gather more solar rays providing faster charging.