?I would recommend (with minimal experience but a couple bad outcomes) do a bunch of research before getting a piece of equpment. There are a couple good sources but I really like
Mobile Solar for specific units, the good and the bad. I almost burned down my garage with a crappy charge controller that probably reversed, and that was with a 12V battery. If you can't afford a decent unit, be careful you aren't risking your life. You don't need the gucci version, just be aware many have limitations, and some of the ebay ones are really really bad. And it had some good reviews...