Mabelstar MPPT Solar Charge Controller auto 12V/24V 100A with LED and LCD Display 1.MPPT Solar Charge Controller 100A 12V/24V with LCD&LED display 2.Three stage charge system for controller.Overcharge protection during controller work. 3.Build-in MPPT tracker for operatizing the power transformation 4.Automatic battery temperature compensation for long term reliability. 5.The maximum open circuit voltage of this controller is 23/45V