This system is based on the Tekkeon 3450 or 3450i lithium battery pack. The Tekkeon offers a very efficient solar panel interface, and most importantly, a MagSafe connector.

Collect solar power all day & store it in the Tekkeon battery. Set the voltage & connect the battery to your MacBook anytime, day or night. The Tekkeon 3450 & 3450i provide approximately the same storage capacity as your MacBook's native battery, which means 2-3 hours of extended use.