Solar power is a great way to get electricity out to a remote project site. One simple way to do this is to use a solar panel to charge the batteries of your cordless power tools. In this project, I am going to show you several ways you can do that.
Safety Note: Any time you use a DIY battery charger instead of a commercial charger, you are accepting a certain amount of risk, so always use caution. Don’t over charge the battery and don’t try to charge it faster than the manufacturer recommends. There are many different kinds of batteries and they all need to be treated differently. These instructions are designed for batteries that are made of Nickle-Cadmium cells. I make no guarantee that these instructions will be appropriate for other battery types such as NiMH or lithium batteries.
View this project on Instructables: http://www.instructables.com/id/Solar-Battery-Charger-For-Your-Cordless-Power-Tool/