Read about my first project; using solar power to recharge my cell phone and MP3 player:
Heh, what you need is a way to solar-power a C64 set-up (more likely, a C64 DTV set-up built into a little case like the Toughbook 64 DTV).

Truly,
Robert Bernardo
Fresno Commodore User Group
http://videocam.net.au/fcug
July 25-26 CommVEx v5 -
http://www.commodore.ca/forum and click on ComVEX
Sounds like a project I might take on down the road. My next project is to run a laptop computer entirely from solar power.