I have purchased a small solar system from a great place in AZ. Their web site has all sorts of great info, and also some formulas to help answer any questions that you might have. One very good tip that they gave me was to use golf cart batteries. they are made for the type of charge and discharge that you need with a small system. Their web site is
http://www.solarpenny.com I have always talked to a guy named Aaron. They really know their business. Solar is all they do.
There is also a guy on youtube that has several informational videos. His name is Lamar Alexander. Here is a link to one of his first videos
http://www.youtube.com/user/solarcabin
Good luck
