Accurate Temperature Compensation: Accurate temperature compensation, the 12v solar panel charge controller can correct the charging and discharging voltage automatically, improving the battery life. Made of premium material, resistant to aging and abrasion Automatic Identification System: Automatic identification system voltage, 12/24V automatic recognition of this solar charge controller. Working storage function: records the total running time of the system, records the time errors during the running time, records the times of the fully charged battery 3-Stage MPPT Charging Mode: The solar panel battery regulator features intelligent 3-stage charging mode. 3-stage high-efficiency MPPT. Solar panels, battery, positive poles of the solar charge controller are all connected together, adopting negative MOSFET in the series control circuit. The charging circuit features high efficiency and low consumption by adopting negative MOSFET in the series control circuit.