Even though I am one of those litigation churning defense attorneys (we don’t do it for the money, just for the sheer joy of aggravating plaintiff’s attorneys), I will chip in my 2 cents worth. Look at the marine supply stores. They usually have a wide variety of solar chargers that sail boaters use. Here is one example:

http://www.westmarine.com/webapp/wcs/sto...roductId=244951