Several readers have asked the Nuts & Volts staff to come up with an inexpensive solar
controller kit for charging 12 volt lead-acid batteries. So, I decided to tackle the project. One of
the first things I do when I design something is ask for specifications of what is needed.
The specifications for this project (given by one of the readers) were to control the charging of
lead-acid batteries up to 12 amps using solar cells. He wanted the unit to start charging if
the battery voltage went below 13. 5 volts, and then turn the charging off when it reached
14. 25 volts.
This project is very inexpensive and fits onto a heatsink that is mountable. Since the voltage is
low, there is no danger of shock. It is simple to build, ideal for the novice, and no special tools
are needed other than a soldering iron and a 9/64" drill.
22 March 2014
BUILD IT YOURSELF
BUILD AN INEXPENSIVE 12 VOLT/
12 AMP MODERN DIGITAL SOLAR
By Ron Newton
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