The THUNDERBOLT SOLAR 100 Watt Solar Charge Regulator, is cheap and easy to use. It can be useful for small solar power projects. I will be showing how to connect and use this charge controller. this controller cost about $20.00 and comes from Harbor freight.
This solar charge regulator protects and regulates the charge from solar panels to a 12 volt storage battery. The solar charge regulator features three LED indicators (high voltage, low voltage, and charging) and three connections for the solar panel (keyed twopin connector), battery (keyed twopin connector) and 12v output (3 in. pigtail). The regulator provides overcharge protection at 14 volts and discharge protection at 10.5 volts.