LM317T Voltage Regulator with Pass Transistor

Charge Controllers are used to maintain batteries within specified limits that prevent over-voltage and under-voltage conditions. they basically keep batteries healthy and they may be used with wind generators or photovoltaic panels. A basic solar charge controller connected with a battery and PV panel and drainback pump can be built for less than $10 worth of parts.



http://www.youtube.com/watch?v=FMUiwqmD5tk&hl=en