The Battery Tender Solar Controller allows you to convert an existing solar panel into a solar charger using Battery Tender patented Super Smart Charging Algorithm. Usable input range between 5-45 Watts!
This patented product from Battery Tender uses a charge controller regulator to control the voltage and current coming from the solar panel. Solar panels for 12 volt batteries put out more volts than that to compensate for times when weather conditions are not ideal for consistent charging. The Battery Tender Solar Controller keeps the excess voltage from damaging the battery.