Feature: 1. EASY ADJUSTMENT: The current buck boost converter adjustment knob can be used to adjust MPPT voltage, output voltage and limit output current, very simple 2. STABLE WORK: Automatic current buck boost converter chip has enhanced heat dissipation. Good heat dissipation performance ensure stable working performance under high power, very efficient and reliable 3. PRACTICAL USE: Booster buck converter is widely used in solar charging, battery lithium charging, LED constant current drive, voltage regulator and so on 4. BETTER DISPLAY: Solar car charging MPPT module support MPPT regulation voltage real time control, lift converter operation is very simple, useful and practical 5. VOLTAGE AND POWER: Power supply voltage regulator has automatic wide voltages of DC6~80V to DC1.3~78V, over power protection 700W, over power will turn off the output Specification: Item Type: Current Buck Boost Converter Model: ZK SJ30 Output Current Adjustment Range: 0 - 30A MPPT Function: Yes(requires external fan for high current usage) Prevent Backflow: Yes(no diode required when connecting to battery) Constant Current(current limit): Yes Overpower Protection: 700W(output shut off and display opp when power exceed limit) Application: Solar charging, storage battery lithium battery charging, LED constant current driver, regulated power supply . Package List: 1 x Current Buck Boost Converter Note: 1. Do not reverse the positive and negative terminals of the input, otherwise it will burn out. 2. When the output end is connected to the battery, the positive and negative terminals cannot be reversed, otherwise it will burn out. 3. The maximum output current of 30A is only limited to when the input voltage and output voltage are 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 greater the heat generation。 When the heat generation is too high, please reduce the power usage, or add a 12V fan (with reserved interface, fan current is less than 200mA) for auxiliary heat dissipation. 4. 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. 5. Output current limit value, generally the allowable charging current of the charging battery, the current setting method is: directly short circuit the output end with wires, adjust the current limit potentiometer while watching the current display value, the displayed value is the current limit value (maximum output current value)。 The product itself has prevent backflow function, and there is no need to connect prevent backflow diode to the output end when charging the battery.