Sunforce 60120 8.5 Amp Pro Series Solar Charge Controller Prevents overcharging of 12 volt batteries and helps protect your solar panels and batteries Controls battery voltage Designed for use in small solar systems where no load disconnect is required, such as yachts and RVs Safety features include: Voltage drop compensation, reverse polarity protection and integrated temperature compensation for use at a broad range of operating temperatures PWM (Pulse Width Modulation) extends the life of the battery