40A 12V/24V/48V PWM Solar Charge Controller

Low price 40A auto PWM solar charge controller with dual USB port, LED display, more clear than the ordinary controller, automatic identification of DC 12V, 24V or 48V, with overvoltage, short circuit, overload, overcharge and over discharge protection.
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Delivery date: 6-20 days
Products specifications

Automatic 40 amp PWM solar charge controller can recognize 12V/24V/48V, multi-function LED display, easy operation, long service life time, it is the best choice for solar power systems.


Model ATO-LS-40
System Voltage DC 12V/24V, DC 24V/48V,automatically switch
The Max Voltage of The Solar Panel Input 50V (12V/24V), 100V (24V/48V)
Self Los ≤13mA
Max Charge Current 20A
Max Discharge Current 20A
LVD (9-11V), 21V (18-22V), 42V (36-44V)
LVR 12.6V (11-13.5V), 25.2V (22-27V), 50.4V (44-54V)
Floating Voltage 13.8V (13-15V), 27.6V(26-30V), 55.2V(52-60V)
Increase the Charge 14.4V/28.8V/57.6V, the battery voltage is below 12V/24V/48V, start extra charge for 2 hours
Batterry overpressure protection 15V/30V/60V
Input Reverse Connection Protection Yes
Load Over Current Protection Yes, every two seconds to restart
Charging Mode PWM
Temperature Compensation -24mV℃, -48mV℃, -96-mV℃, relative to 12V/24V/48V System
Operating Temperation -20℃- +55℃
Terminal Scale 28-10AWG
Waterproof level IP 32
Product Size 195mm*107mm*59mm
Weight 850g


  • Automatic identification system voltage 12V/24V or 24V/48V.
  • Personalized LCD display and two-button operator and page.
  • High performance PWM three-stage charging.
  • You can choose to load the control template and set the streetlights in the world at night.
  • With overvoltage, short circuit, overload, overcharge, over discharge protection.
  • Accurate temperature compensation, correct charging and discharging voltages automatically extend battery life.
  • The default setting can be reset when the controller with the parameter set is powered off.
  • The positive and negative terminals of the input terminal are reversely connected to protect.

Circuit Diagram
PWM solar charge controller circuit diagram

Tips: What is The Role of Solar Street Light Controllers?
The solar street light controller has a control function. Under normal working conditions, when the solar panel is charged by the solar street lamp controller, the controller will automatically detect the charging voltage, and then the smart controller in the solar controller The chip will control the output of the LED lamp without outputting voltage, which can control the LED to light up.

The solar street light controller has a boosting effect. Under normal working conditions, when the solar street lamp controller does not detect the output voltage, the solar controller controls the output voltage from the output terminal. At this time, if the battery voltage is 24 volts, it needs 36 volts to reach the normal lighting requirement. Left and right, in order to meet the demand of the input voltage of the light source, the controller will raise the voltage. At this time, the LED street light controller must be used to realize the lighting of the LED light.

The solar street light controller has a voltage regulation function. When the solar panel charges the battery, its voltage is very unstable. If it is directly charged, it will reduce the battery life or damage. At this time, the voltage regulation function in the solar street lamp controller will input the battery. The voltage is subjected to constant voltage limiting. When the battery is fully charged, it will charge its small current or not.

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