Feature:1. Easy To Adjust: This automatic wide voltages regulator is designed with an adjustment knob, which can be used to adjust the MPPT voltage, output voltage and limit the output current in a very simple way.2. LED Display Screen: This automatic buck boost converter adopts LED display screen, which can clearly display the input voltage, output voltage, temperature, output current, output power (key switching).3. Stable Working: This automatic bucking boosting converter module has good heat dissipation performance, which ensures stable working performance under high power, and is very efficient and reliable.4. Over Power Guard: This boost and buck converter module has an over power guard function, when the power exceeds 700W, it will shut down the output and display OPP, which is very safe and reliable.5. Wide Application: This adjustable voltage module has a wide range of applications, supports MPPT regulation voltage real time control, boost and buck converter operation is very simple, widely used in solar charging, battery lithium charging, LED constant current driver, voltage regulator and so on.Specification:Item Type: Automatic Buck Boost Power Supply ModuleMaterial: PCBModel: ZK-SJ30Output Current Adjustment Range: 0-30ACurrent Display Range: 0.00A-30.00A (Accuracy 0.03)MPPT Function: Yes (External fan required for use with high current)Anti Reverse Connection: Yes, no diode required when connecting to battery.Constant Current (Current Limit): YesOverpower Guard: 700W, output shuts off and displays OPP when power exceeds limit..Package List:1 x Automatic Buck Boost ConverterNote:1. Do not connect the positive and negative terminals backwards, otherwise it will burn out.2. When connecting the battery to the output terminal, do not connect the positive and negative terminals backwards, otherwise it will burn out.3. The maximum output current of 30A is only available when the input voltage and output voltage difference is small, and the output power does not exceed 700W. The greater the voltage difference between the input and output, the lower the conversion efficiency and the more serious the heat generation. When the heat generation is too serious, please reduce the power usage or add a 12V fan (with reserved interface, the fan current is less than 200mA) to assist in heat dissipation.4. The MPPT voltage is generally set to 0.75 times the open circuit voltage of the solar panel. You can also refer to the nameplate or consult the solar panel manufacturer for the Vmp voltage value. The Vmp voltage value is the MPPT voltage we need to set. The display screen can display the set voltage, and the adjustment is clear at a glance, which is very convenient.5. Output current limit value, generally the allowed charging current of the charging battery. The current setting ways is: short circuit the output terminal directly with a wire, observe the current display value, and adjust the potentiometer. The displayed value is the current limit value (maximum output current value). The product itself has an anti backflow function, so no