1.Description:
   It is a DC-DC 300W MPPT Boost Buck Voltage Converter CVCC LCD Display Step UP/Down Power Supply Module Solar Charger. It can be used in Solar charging, lithium battery charging, LED constant current drive, regulated power supply.

2.Feature:
  1>.All adopt screwdriver free potentiometers for direct manual adjustment
  2>.The chip enhances heat dissipation, reliability, stability and high power
  3>.Reserved 5V fan interface for customers
  4>.Real time display of MPPT regulating voltage at a glance

3.Parameter:
  1>.Input voltage range: DC 7-80V
  2>.Output voltage range: DC 1.4-79V
  3>.Voltage display range: 1.40-80.00V(Accuracy±0.1V or so)
  4>.Output current regulation range: 0-20A
  5>.Current display range: 0.00-20.0A(Accuracy±0.03A or so)
  6>.Adjusting Knob: MPPT voltage regulation, output voltage regulation,output current limiting regulation
  7>.MPPT function: Yes
  8>.Anti-backflow: The battery does not burn after recharging. When the sun is insufficient and there is no charging current, there will be 0.5~40mA recharging current. It is recommended to connect the diode during charging.
  9>.Constant current(Current limiting): Yes
  10>.Overpower protection: 300W, if the power is exceeded, the output will be turned off and OPP will be displayed
  11>.Size: 108x64x48mm

4.Charging steps of solar cell:
  1>.Measure the no-load voltage of the solar panel (with sufficient sunlight), calculate the MPPT voltage=0.75* no-load voltage, or directly check the Vmp parameter value of the manufacturer's panel. Note that the positive and negative electrodes shall not be connected reversely;

  2>.The solar panel access module supplies power, switches to the MPPT voltage display interface, adjusts the MPPT potentiometer, and adjusts the value to Vmp voltage;

  3>.Rotate the CV potentiometer to adjust the output voltage (the size is the floating charge voltage of the charged pool);

  4>.Short circuit both ends of the positive and negative output poles, rotate the CC potentiometer, and adjust the limiting current (the size is the allowable charging current of the charged pool). If the power of the solar panel is too small, the MPPT light will be on when the circuit is short circuited.

     In order to maintain the input constant voltage, the output current will be limited. The current can only be adjusted downward. The current value seen when the MPPT light is off is meaningful. It is recommended to adjust the current when sunlight is sufficient or constant voltage source is used as input;

  5>.Connect the battery for charging (note that the positive and negative electrodes should not be connected reversely). The MPPT potentiometer can be properly adjusted so that the module is always at the maximum power point output. It is recommended to connect the diode to completely prevent reverse flow.

5.Notes:
  1>.The input positive and negative poles cannot be connected reversely, or they will be burned;

  2>.When the output terminal is connected to the battery, the positiveand negative electrodes must not be reversed, otherwise they will be burned;

  3>.The maximum output current of 20A is only limited to when the difference between input voltage and output voltage is small, andthe output power does not exceed 300W. The greater the difference between input and output voltage, the lower the conversion efficiency and the more serious the heating. If the heating is tooserious, please reduce the power for use, or add a 5V fan (with reserved interface and fan current less than 300mA) to assist in heat dissipation.

  4>.The MPPT voltage is usually 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's Vmp voltage value, which is the MPPT voltage we want to set. The display screen can display the set voltage, which is easy to adjust.

  5>.The output current limiting (CC) value is generally the allowable charging current of the rechargeable battery. The current setting method is: short-circuit the output terminal directly with a wire,and adjust the Cc potentiometer by looking at the current display value. The displayed value is the current limiting value (maximumoutput current value).

6.Package:
  1pcs DC-DC 300W MPPT Boost Buck Voltage Converter.