The Solar ZipCharger Kit is a build-it-yourself solar cell phone or mp3/ipod charger. Any small device that has it’s own rechargeable battery can be powered with the ZipCharger. Two 1.25 watt @ 12vdc (100mA) solar laminates come together in this zippered travel wallet, with an auto socket for charging cellphones. A USB car charger is included to power devices with USB cords.
Instructions for building a Solar Zipcharger [pdf] v20130120
As of September 2017, the Zipcharger is no longer available. The solar laminates that we had have been exhausted.