I know some of us use solar panels with our vans. Here is a look-see
into a different kind of solar panel using aluminum drink cans as the
core. Invented by a guy out of Newfoundland.

For the technoids and/or crafty among us - this may hold possibilities.

http://www.offgridworld.com/heat-your-home-with-240-recycled-aluminum-cans/

John