In this instructable I will show you how to make a solar powered bike stereo box that fits in a milk crate, which you may already have on your bike! This instructable assumes you have some proficiency in woodworking and soldering, and is really about the solar to battery circuitry and the options it provides. This system could be used for any variety of applications that run off 12v DC.
In designing this project the box went through many phases, first it was battery powered, then the solar was added, and more extra bits kept finding their way into the box. Because of this the photos will appear somewhat inconsistent, so I have provided some easy to read drawings for clarification.