If you are really interested in adding solar there is a lot to read and understand to buy a system that really will do all you need. A lot of cheap and expensive kits are available through dealers and on the net that wont do enough to charge the batteries full. Buyer be aware.
I started reading and learning all you need to install or have installed the right components to get the most out of you money. I asked like you on a site like this and someone sent me this mans address and now I understand it all.
He is not selling anything just a great guy trying to help educate us out here through his discovery with solar. link
http://handybobsolar.wordpress.com/the-rv-battery-charging-puzzle-2/
He has written so much about the subject and their is a lot of reading, but like me you will become fully educated on how to live off the grid with 2 panels (360 watts) 2 batteries ( 6 volt) and never run out on power. Not get ripped off by dealers selling you short on what you need. Be an educated buyer.