Here's a marvelous tutorial for a DIY solar generator, perfect for campsite use.
Materials:
1.26w weather proof solar panel $30.00
12v 7.5amp rechargeable sealed lead-acid battery $30.00
12v socket $11.00
cooler $8.00
nuts/bolts $2.00
wire plugs $2.00
super glue $1.00
TOTAL COST: $84.00
Tools Needed:
drill
utility knife
screw drivers
wire cutters
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I put one of these together but with an additional component: a charge-controller.
http://www.affordable-solar.com/morningstar.sunguard.4.12volt.charge.controller.htm
It's a gizmo that controls the charging process and prevents your battery from de-charging at night. I never thought of putting it in a cooler though. That is a good idea.
Here is a picture of mine charging up my cell phone:
http://flickr.com/photos/dave_menninger/84611942/
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