30 Amp Digital Charge ControllerMaintenance free protection for your batteries and solar panels. A Solar Charge controller regulates the voltage and current or amperage coming from the solar panels going to the battery and prevents the solar panel from overcharging 12V batteries. It also prevents reverse currents to panels during the night and regulates the voltage that comes from the solar panel which can vary with the sun conditions.Features and Specifications Protect Battery from Overcharge and Discharge For Use with 12 Volt Solar Panels and Batteries Only Handles up to 30 Amps of Array Current Handles up to 500 Watts of Solar Power Maintenance Free Protection of Your Solar Panel and Batteries Maintains Battery Voltage Maintain 12V Batteries in a Fully Charged State Dimensions: (L x W x H) 8 3/4" x 10 1/4" x 2 5/8" Weight: 0.85 lbs Item#: 60032 / UPC#: 787769600329User Manual