Solar what? Solar powered device? Solar panels? You need to give us a bit more information then that.
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1. it is probably less trouble to buy one.2. you won't find much with tags like ASS, make it sensible and you might see something in the related column3. give as much information as you can - That way we are not guessing what you really need.
Something like this: http://www.seeedstudio.com/depot/index.php?main_page=advanced_search_result&search_in_description=0&keyword=solar&x=0&y=0(or many other hobbyist/electronics sites will have similiar parts stocked)