20 Amp 12/24/48V MPPT Solar Charge Controller

Low price 20 Amp MPPT solar charge controller, 12V/24V/48V DC auto identification, real-time LCD display, high efficiency more than 98.5%, support lead-acid battery and lithium battery, 3-stage battery charging, with multi-protection function, excellent performace and long service life.
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Delivery date: 6-20 days
Products specifications


  • MPPT solar charge controller 12V/24V/48V auto identification, max. PV input voltage 150V, maximum PV input power 280W (12V), 550W (24V), 1100W (48V).
  • LCD display real-time power generation and current, daily power generation, cumulative power generation and fault record.
  • Adopting the advanced MPPT algorithm to track the maximum power point of solar power generation in real time, high charging efficiency over 98.5% and tracking accuracy over 99.73%.
  • Support lead-acid batteries, colloidal batteries and lithium batteries. 3-stage battery charging for efficiency and safety.
  • Battery temperature sensor (BTS) automatically provides temperature compensation to ensure the controller's life.
  • Multiple protection including PV array short circuit, overvoltage, and overcurrent reverse polarity protection; battery overcharge, reverse connection, under voltage protection.


Rated Voltage 12V/24V/48V Auto
Rated Current 20 Amp
Maximum Protection Current 22 Amp
Battery Voltage Identification Range 12V (DC 9V-15V), 24V (DC 18V-30V), 48V (DC 36V-60V)
MPPT Operating Voltage Range 12V (DC 18V-150V), 24V (DC 34V-150V), 48V (DC 65V-150V)
Maximum PV Input Power 12V: 280W, 24V: 550W, 48V: 1100W
PV Input Low Voltage Protection Point 12V: DC 16V, 24V: DC 30V, 48V DC 60V
PV Input Low Voltage Recovery Point 12V: DC 18V, 24V: DC 34V, 48V DC 65V
Limit Input Voltage DC 170V
PV Input Overvoltage Protection Point DC 175V
PV Input Overvoltage Recovery Point DC 170V
Charging Method 3 stage: constant current (MPPT), equalize charge, float charge
System Type 12/24/48V Automatic identify (36V manual setting)
Static Power Consumption 2W
Machine Efficiency 96.50%
PV Module Utilization 99.97%
Float Charge Voltage 12V (13.75V), 24V (27.5V), 48V (55V)
Equalize Charge Voltage 12V (14.2V), 24V (28.4V), 48V (56.8V)
Recommanded PV Module Voltage 12V (DC 18V-60V), 24V (DC 36V-72V), 48V (DC 72V-144V)
Temperature Compensation -3mV℃/2V
Temperature Protection 85℃
Temperature Rise Protection 80℃ or more to reduce power output
Protective Function PV array short circuit, overvoltage, overcurrent reverse polarity protection; battery overcharge, reverse connection protection, under voltage protection
Working Temperature -10℃ ~ +45℃
Humidity 0~90% RH (no condensation)
Altitude 0~3000m
Security Level CE, PSE, FCC, EMC
Mechanical Protection Class IP21
Optional Battery Type* Lead-acid battery (Factory default), colloidal batteries, liquid batteries, lithium batteries (Also can be customized for other types of battery charging)
Product Size 218*154*65mm
Weight 2.6kg


* If you need this charge controller for charging the lithium battery, please contact us in advance and provide us the parameters of your lithium battery including equalize charge voltage, float charge voltage, maximum charge current, end-of-discharge voltage, and recovery voltage, so as to help you choose a most suitable charger controller.

Wiring Diagram

MPPT solar charge controller connection diagram

Tips: Troubleshooting the Solar Charge Controller of Off-Grid Solar System

1. The solar panel cannot charge the battery.

  • Confirm that the solar panel connection is correct, and check whether the positive and negative electrodes are reversely connected.
  • Check whether the solar panel is blocked.
  • Is the specification of the selected solar panel correct? Whether the open circuit voltage meets the requirements of the charge controller.
  • Does the power of the solar panel exceed the rating of the solar controller. If the power is too high, it may cause the solar charge controller to burn out.
  • Check whether the battery is full. Once the battery is fully charged and the controller enters the floating charge phase, and the charging current will become very small.

2. The battery power is low, and soon it is out of power.

  • Whether the battery capacity design is reasonable, the capacity is too small, and the use time is naturally short.
  • The battery is aging. The service life of the battery is generally 2-3 years, and the capacity of the battery is greatly attenuated. The battery needs to be replaced periodically.
  • Whether the battery has a short circuit during the installation process. The capacity of the battery damaged by the short circuit is greatly reduced.
  • The load power exceeds the design power.

3. The load can not work.

  • Check if the working voltage of the load is consistent with the output voltage of the solar charge controller.
  • Whether there is short circuit or overload in the load.
  • Whether the load output of solar charge controller is manually turned off.
  • Whether the battery voltage is too low or too high leads to the controller load protection

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