Item Description 100 Amp 350 SAR 80 Amp 300 SAR 60 Amp 250 SAR MPPT/PWM/ 100A/ 12v 24v 36v 48v Solar panel charge controller with LCD screen Dual USB Multiple load control modes New PWM/Mppt technology Maximum current charging The controller is 12/24/36 / 48V automatic, but the voltage of the photovoltaic panels used to charge different batteries is different. For 12V batteries, use about 18V of photovoltaic panels, for 24V batteries, use about 30-37V of photovoltaic panels, and for 48V batteries use 60. For photovoltaic panels around -72V, the controller wires are connected to the battery first, then to the photovoltaic panel. Disconnect the wire in reverse, otherwise it will easily cause damage to the controller!!! Charging Protection Description: 1. When using a 12V battery, the battery boost charging voltage is higher than 14.8V, and it is converted to a floating charging voltage of 13.8V. 2. When using a 24V battery, the battery boost charging voltage is higher than 29.6V, and it changes to a floating charging voltage of 27.6V. 3. When using a 36V battery, the battery boost charging voltage is higher than 44.4V, and it changes to a floating charging voltage of 41.4V. 4. When using a 48V battery, the battery boost charging voltage is higher than 59.2V, and it changes to a floating charging voltage of 55.2V. Clock Setting Instructions: When the battery is connected, press ▲ to adjust the clock table, briefly press to save. Charging Voltage Setting Instructions: After the battery is connected, after adjusting the clock and saving, long press for 3-5 seconds, the screen displays L**V as the floating charging voltage, which can be adjusted by pressing briefly again ▲ H**V to increase the charging voltage, which can be adjusted by pressing again briefly press again. F**V is the DC load low voltage cut-off voltage, which can be adjusted by pressing After adjustment, long press for 3-5 seconds to save and exit. Note: 1. Please connect the battery to the controller first, then the solar panel to ensure that the battery voltage is higher than (12V battery higher than 10V; 24V battery higher than 20V; 36V battery higher than 30V; 48V battery higher than 40V), otherwise it will cause voltage identification error. 2. This is a high-quality compatible with MPPT + PWM solar controllers , not 100% True MPPT