If you look around, you can sometimes find a deal on a decent charge controller. I think I paid ~$35 for my little Sunsaver 6. For manual switch controlled interior lighting, you can do quite a bit with a charge controller that will handle 6A.
The SunSaver doesn't have the automatic switching function that the SunLight10 has, and won't handle 10A, but there's a ~$60 price difference.
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