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*S=Standard, R=Rapid charge, H=High temperature, E=High capacity *cost from Digi-Key

2 3 4 5 6 7 8 9 10 11 12 13 14 15 hours of time How fast your batteries are charged depends on the module you use. Take a look at the chart above. A photovoltaic module that produces 50 mA will charge standard or rapid charge AAs in about 15 hours; one that produces 500 mA will charge R type AAs in about 1.5 hours. A PV module that produces 400 mA would charge R type AAs in 4.5 hours.

How many cells?

Once you know the size of cells you want to solar charge and how fast you need to charge them, another consideration is how many. The voltage of the PV module determines the number of cells you can charge. Allow 3 Volts for each two cells in series.

A 12 Volt panel is quite versatile. We can charge 1-8 small cells from our Jetski PV module, or keep a large car battery topped off (the module is too small to fill a dead or dying car battery). We have an 8 cell holder (available at Radio Shack) and alligator clip leads from the module so we can charge 1 to 8 cells. How can you charge 1 to 8 cells with a 12 Volt panel? This confused me at first, but when I measured current vs. voltage for a few small panels, this made more sense. I measured the Jetski's open circuit voltage (voltage across the two leads of the module in the sun, current is zero). I measured short circuit current (current through the two

Current-Voltage Curves

DIY Battery Repair

DIY Battery Repair

You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.

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