Guangdong, China
Business Type:
Manufacturer/Factory, Trading Company
OEM/ODM Service
Sample Available

Solar Controller, Solar Charger Controller, MPPT Controller manufacturer / supplier in China, offering 20A 12/24V MPPT Solar Charger Controller (QW-ML2420), MPPT Solar Charge Controller DC 12V 24V 48V 100A, 100A 12V/24V/48V MPPT Solar Charger Controller for Solar Power System and so on.

Gold Member Since 2013

20A 12/24V MPPT Solar Charger Controller (QW-ML2420)

Purchase Qty. / Reference FOB Price
50-99 Pieces US $50
100-299 Pieces US $48
300+ Pieces US $46
Port: Guangzhou, China
Production Capacity: 20000 Units/Month
Payment Terms: T/T, Western Union, Money Gram, Credit card
Condition: New
Certification: CE
Application: Home
Specification: Normal, CE, Rohs, SGS
Charging Current: 20A
System Voltage: 12V / 24V

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Basic Info.

Model NO.
Way to Work
Double Time Electric+MPPT Control
State Instructions
LCD Display
Voltage, Current, Battery Electric Quantity
Heat-Dissipating Method
Max. Power of Solar Panel
260W/12V; 520W/24V
Housing Color
Discharge Current
Max. Solar Panel Voltage
Battery Voltage
9 to 35V
Max. Photovoltaic System Input Power
260W/ 12V 520W/ 24V
Conversion Efficiency
MPPT Tracking Efficiency
Transport Package
Paper Box / Unit
Guangzhou, China
HS Code
20A 12/24V MPPT Solar Charger Controller(QW-ML2420)

Can be used for lithium batteries and with USB port. Charging program options forsealed, GEL and flooded lead-acid batteries and lithium batteries are available.

20A 12/24V MPPT Solar Charger Controller (QW-ML2420)
20A 12/24V MPPT Solar Charger Controller (QW-ML2420)
20A 12/24V MPPT Solar Charger Controller (QW-ML2420)

20A 12/24V MPPT Solar Charger Controller (QW-ML2420)
1Charging indicator10Battery "+" interface
2Battery indicator11Battery "-" interface
3Load indicator12Load "+" interface
4Abnormality indicator13Load "-" interface
5LCD screen14External temperature sampling interface
6Operating keys15RS232 communication interface
7Installation hole  
8Solar panel "+" interface  
9Solar panel "-" interface  

Product Features

  With the advanced dual-peak or multi-peak tracking technology, when the solar panel is shadowed or part of the panel fails resulting in multiple peaks on the I-V curve, the controller is still able to accurately track the maximum power point.
A built-in maximum power point tracking algorithm can significantly improve the energy utilization efficiency of photovoltaic systems, and raise the charging efficiency by 15% to 20% compared with the conventional PWM method.   
A combination of multiple tracking algorithms enables accurate tracking of the optimum working point on the I-V curve in an extremely short time.
The product boasts an optimum MPPT tracking efficiency of up to 99.9%.
Advanced digital power supply technologies raise the circuit's energy conversion efficiency to as high as 98%.
Charging program options are available for different types of batteries including gel batteries, sealed batteries, open batteries, lithium batteries, etc.
The controller features a limited current charging mode. When the solar panel power exceeds a certain level and the charging current is larger than the rated current, the controller will automatically lower the charging power and bring the charging current to the rated level.
Instantaneous large current startup of capacitive loads is supported.
Automatic recognition of battery voltage is supported.
LED fault indicators and an LCD screen which can display abnormality information help users to quickly identify system faults.
Historical data storage function is available, and data can be stored for up to a year.
The controller is equipped with an LCD screen with which users can not only check device operating data and statuses, but also modify controller parameters.  
The controller supports standard Modbus protocol, fulfilling the communication needs of various occasions.
The controller employs a built-in over-temperature protection mechanism. When temperature surpasses the set value, the charging current will decline in linear proportion to the temperature so as to curb the temperature rise of the controller, effectively keeping the controller from being damaged by overheat.
Featuring a temperature compensation function, the controller can automatically adjust charging and discharging parameters in order to extend the battery's service life.
TVS lighting protection20A 12/24V MPPT Solar Charger Controller (QW-ML2420)

Protection Functions

  • Waterproof
Waterproof level: IP32
  • Input power limiting protection
When the solar panel power exceeds the rated power, the controller will limit the solar panel power under the rated power so as to prevent excessively large currents from damaging the controller and enter into current-limited charging.
  • Battery reverse connection protection
If the battery is reversely connected, the system will simply not operate so as to protect the controller from being burned.
  • Photovoltaic input side too high voltage protection
If the voltage on the photovoltaic array input side is too high, the controller will automatically cut off photovoltaic input.
  • Photovoltaic input side short-circuit protection
If the photovoltaic input side gets short-circuited, the controller will halt charging, and when the short circuit issue gets cleared, charging will automatically resume.
  • Photovoltaic input reverse-connection protection
When the photovoltaic array is reversely connected, the controller will not break down, and when the connection problem gets solved, normal operation will resume.
  • Load overpower protection
When the load power exceeds the rated value, the load will enter into delay protection.
  • Load short-circuit protection
When the load is short-circuited, the controller can implement protection in a quick and timely manner, and will try to switch on the load again after a time delay. This protection can be carried out up to 5 times a day. Users can also manually address the short circuit problem when finding the load is short-circuited via the abnormality codes on the system data analysis page. 
  • Reverse charging protection at night
This protection function can effectively prevent the battery from discharging through the solar panel at night.
  • TVS lighting protection.
  • Over-temperature protection

What is MPPT solar controller?

MPPT solar controller is designed for solar power system design; Equipment can not only efficiently transfer issued by the solar panels to recharge the battery power, but also provides a powerful control functions.

Features: The controller is characterized by intelligent adjustment of the operating voltage solar panels, solar panel always working at the VA characteristic curve of the maximum power point. More common, solar controller, solar panels for power generation increased utilization of 10-30%!

The controller uses solar panels for intelligent charging of the battery. In the solar panel power than the battery storage capacity, the control system automatically cut off the charge, thus ensuring optimum battery charging features, making full use of electricity.

As the battery can only withstand a certain degree of charge current and float voltage, over current and over-voltage charging the battery will cause serious damage. The controller battery charge grams of real-time detection voltage and charging current, and by controlling the charge current to limit the photovoltaic battery charging voltage and charging current to ensure that both the battery is full, it will not be damaged. To increase of the battery service life.

About us:
Guangzhou Queenswing Solar Energy Co. Ltd. Is a professional manufacturer and exporter of solar products including power inverter, solar charge controller, solar panel and solar battery in China. To provide high-quality product and considerate service is always our basic policy. We believe high quality creates business and progress is from improvement.
20A 12/24V MPPT Solar Charger Controller (QW-ML2420)


Main products:
Pure sine wave power inverter
Modified sine wave power inverter
UPS power inverter with charger
Car power inverter
Solar charge controller
Battery Charger
Solar panel
Solar battery

Our power inverter and solar products are exported to most global coutries and get good reputation because of our favorable quality and stable performance.

Payment Terms:
T/T, Western Union, Money Gram
Production arranged after receipt of payment.

Lead Time:
Sample order will be delivered within 7 working days.
Order quantity below 100PCS, delivery time is 7-15 working days.
Container order will be delivered within 15-30 working days.

Courier: FedEx, DHL, TNT, UPS, Aramex, EMS ect.
Forwarder: By sea / air or Customer designated

Contact us:

Different type offered:
12v-10a battery charger;
12v-20a battery charger;
12v-30a battery charger;
24v-10a battery charger;
24v-20a battery charger;
24v-30a battery charger;

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