Solar Battery Regulator

Solar Battery Regulator

Product name:PWM solar charge controller 40A
Model No.:CL48 - 40DU
Working principle:PWM Solar Charge Controller is a photovoltaic (PV) charge controller that tracks the PV array to deliver the available current for charging batteries. When charging, the Controller regulates battery voltage and output current based on the amount of energy available from the PV array and state-of-charge of the battery.



40a solar battery regulator information

Manual PWM solar battery regulator 40A

Our CL series is an economical and traditional PWM solar controller. It can not only extend the service life of battery, but also provide necessary protection over the whole system. We own its outlook design patent. The double buttons and LCD screen show you the working parameters of the whole system, clear and understandable. This series is widely applied in solar home system, traffic signal, solar lighting system etc.

Technical Data for CL40a controller





PV input voltage


Rated charge current



System voltage


Battery over-voltage protection voltage

16.00V×1/×2/×3/×4 (0.5V differents)

Rated discharge current




Charge loop voltage drop


Discharge loop voltage drop

≤ 0.1V

Charging mode

PWM 4 stages (bulk, absorption,float,equalized)

Float Charge Voltage


Absorption charge voltage

14.4V(13V~15V) ×1/×2/×3/×4

Duration of Absorption Charge


Voltage of equalized charging *

14.6V(13V~15.5V) ×1/×2/×3/×4

Duration of equalized charging


Low voltage disconnection

10.7V(10V~14V) ×1/×2/×3/×4

Low voltage reconnection

12.6V(10V~14V) ×1/×2/×3/×4

Load working mode

Regular control mode,Light control with switch-off point at night and switch-on point before dawn,Light control mode

Light control voltage

5V(1V~10V) ×1/×2/×3/×4

Battery type



USB port




LCD,2 buttons


PCB terminal, ≤10mm2

Working temperature

-20 ~ +55 °C

Storage temperature

-30 ~ +65 °C

Working humidity

10% ~ 90%, no condensation





IP code


Optional function

Remote communication,TTL, standard ModBus protocol

Connection diagram


About 40 amps solar controller

1. Intuitionistic LED indicators show the system battery capacity,charging and discharging state of battery.

2. Having the protection functions as over charging,over discharging ,overload,short circuit and reversed connection.

3. Tandem type PWM charging makes the charging efficiency increase by 3% to 6%,compared with non-PWM charging.

4. The parameters of charging and discharging have been set during the production(special parameters need to be told in advance),so no need to adjust the parameters.

5. You can set the working mode of the load.

6. Prevent battery from discharging to battery at night.

Application for solar charge controller

Our Advantage

Our factory

Our market



Q1:What is a Solar Charge Controller? Why do I need one?

A charge controller, or charge regulator is basically a voltage and/or current regulator to keep batteries from overcharging. It regulates the voltage and current coming from the solar panels going to the battery. Most "12 volt" panels put out about 16 to 20 volts, so if there is no regulation the batteries will be damaged from overcharging. Most batteries need around 14 to 14.5 volts to get fully charged.

Q2: What's A PWM solar charge controller ?

A :PWM solar charge controller stands for “Pulse Width Modulation”. These operate by making a connection directly from the solar array to the battery bank. During bulk charging, when there is a continuous connection from the array to the battery bank, the array output voltage is ‘pulled down’ to the battery voltage. As the battery charges, the voltage of the battery rises, so the voltage output of the solar panel rises as well, using more of the solar power as it charges. As a result, you need to make sure you match the nominal voltage of the solar array with the voltage of the battery bank. *Note that when we refer to a 12V solar panel, that means a panel that is designed to work with a 12V battery. The actual voltage of a 12V solar panel, when connected to a load, is close to 18 Vmp (Volts at maximum power). This is because a higher voltage source is required to charge a battery. If the battery and solar panel both started at the same voltage, the battery would not charge.

Q3. May I take some samples to test before placing the order ?

A: Yes, but customers need to pay for the sample fees and express fees, and it will be returned when next order is confirmed. 

4Q:Can we print our company logo on product and package?

A:Yes,but quantity of order is required. And we also need you to offer the Trademark authorization to us.

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