- How to Make Solar Battery Charger ?-First we need an old window, I got mine from a construction site. Its your basic old nasty basement window. Make sure you wash both sides of the glass well with soap and water and window cleaner, more dust means less light gets through to your solar cells.

Next take your multi-meter and sit in a sunny spot (or under a flood lamp) and check all your cells to make sure they get about .5 volts per cell. You do this by gently (cells are REALLY fragile) putting the red on the front (make sure its on the little metal lines) and black on the back (any place) of each cell while it is in the sun. It should say about .5 volts. If you get a really bad one don’t use it as it will lower the power of your charger.

For this project I used 12 cells but you really only need 6. So if you are on a budget use 6 but if you want a fast charger use 12. Next lay out all your cells on your window to make sure everything is going to fit. I used the “deeper” side of the window so that there would be more room for a backing and also because the other side has a shallower well that would cast less of a shadow on my cells if the sun moved while I had my panel laying out.

As you can see they all fit with a lot of room left over, if I wanted to I could have used this window for a larger project but I only need a battery charger for right now.

Source  and More :  Build your own solar battery charger

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