April 27, 2009 5:00 AM PDT
Let the sun power your calls
A Bluetooth speakerphone with no juice won't let you make hands-free calls, so Scosche equipped its SolChat device with a solar panel. When your car is parked in the sun, the SolChat keeps itself charged and ready. For winter months and enclosed garages, the SolChat also has a 12-volt charging cord.
Read our review of the Scosche SolChat solar-powered Bluetooth speakerphone.

http://www.youtube.com/watch?v=_l4TbitxC7c
powering a car
http://www.youtube.com/watch?v=vm4PW5CsOIM
I'm only being somewhat facetious. This was meant to show the magnitude of the problem and a creative answer.