read all you can on Handy bobs site about solar and batteries.. better to know what and how rather than just buy some **** and slap it together and be disappointed when it does not work well..
start small but be able to expand for more power in the future is the way to look at this.
https://handybobsolar.wordpress.com/2011/01/19/welcome-to-handybob-solar/
it a lot to read but worth the effort if you are wanting to do real solar power not the fake stuff like you get a harbor freight tools and such or the local RV dealer.