40A 12V 24V PWM Solar Charge Controller with LCD Display and Dual USB

Control and monitor a small off-grid solar battery setup with this 40A 12V / 24V Pulse Width Modulation solar charge controller.

It is designed for low-voltage solar charging systems using compatible lead-acid batteries, including Open, AGM and Gel battery types. The controller regulates charging from a solar panel to the battery and provides a separate low-voltage load output for direct current loads.

The built-in Liquid Crystal Display shows key charging and discharge information, while the front-panel buttons allow adjustment of settings such as float voltage, low-voltage disconnect, low-voltage reconnect and load timer modes.

Dual USB output is included for convenient charging of small USB-powered devices, with a stated maximum output of 5V / 2A.

This controller is best suited to compact solar projects, camping setups, shed lighting, caravan power systems, battery maintenance setups and other low-voltage direct current solar applications.

Key Features

• 40A rated solar charging current
• Compatible with 12V and 24V battery systems
• Automatic 12V / 24V system voltage identification
• 4-stage Pulse Width Modulation charging: Boost, Absorption, Equalisation and Float
• Suitable for lead-acid battery types including Open, AGM and Gel
• Liquid Crystal Display for system status and charging information
• Adjustable float voltage, low-voltage disconnect, low-voltage reconnect and load timer settings
• Dual USB output with stated maximum 5V / 2A output
• Separate terminals for solar panel, battery and load connections
• Built-in protection functions including short-circuit, reverse polarity, overload, overheat and backflow protection
• Low standby current of less than 10mA
• Suitable for dry, protected installations

Compatibility

Suitable for:

• 12V lead-acid solar battery systems
• 24V lead-acid solar battery systems
• Open lead-acid batteries
• AGM lead-acid batteries
• Gel lead-acid batteries
• Solar panel to battery charging setups
• Low-voltage direct current load control
• Camping, shed, caravan and small off-grid solar projects

Not suitable for:

• 230V mains wiring
• Grid-tied solar systems
• Household switchboard connection
• Alternating current loads
• Direct connection to mains appliances
• High-voltage solar panel strings
• Lithium batteries unless compatibility is separately confirmed
• Outdoor exposed mounting without a suitable enclosure
• Applications requiring a verified Maximum Power Point Tracking controller

Technical Specifications

• Product Type: Pulse Width Modulation solar charge controller
• Rated System Voltage: 12V / 24V direct current
• Voltage Detection: Automatic 12V / 24V identification
• Rated Charging Current: 40A
• Rated Discharge Current: 20A
• Battery Compatibility: Open, AGM and Gel lead-acid batteries
• Charging Stages: Boost, Absorption, Equalisation, Float
• Maximum Photovoltaic Input Voltage: Less than 25V for 12V systems, less than 50V for 24V systems
• Discharge Cut-Off Voltage: 10.7V default
• Discharge Cut-Off Adjustment Range: 9.5V–11V
• Discharge Recovery Voltage: 12.6V default
• Discharge Recovery Adjustment Range: 11.5V–13V
• USB Output: Dual USB output
• USB Rating: Stated maximum 5V / 2A
• Display: Backlit Liquid Crystal Display
• Adjustable Settings: Float voltage, low-voltage disconnect, low-voltage reconnect, load timer
• Standby Current: Less than 10mA
• Operating Temperature: -35°C to +60°C
• Protection Functions: Short-circuit, open-circuit, reverse polarity, overload, backflow, overheat, undervoltage discharge
• Backflow Protection: Dual MOSFET backflow protection
• Energy Memory Function: Charge and discharge current / energy auto memory function
• Internal Material: Electronic components
• Approximate Size: 133 x 70mm
• Installation Location: Dry protected location
• Waterproof Rating: Not specified
• Included Items: 1 x solar panel charge controller, 1 x user manual
• Not Included: Solar panel, battery, inverter, wiring, fuse, circuit breaker, mounting screws, tools
• Product Category: Solar charge controllers
• Applications: Solar lighting, camping power, battery charging

Important Installation Notes

Use correct direct current cable size, correct polarity and suitable fuse or circuit breaker protection for the final system.

For best protection, install a correctly rated direct current fuse or circuit breaker close to the battery positive terminal. The correct fuse size depends on the controller rating, cable size, battery type and complete system design.

Recommended connection order:

• Connect the battery first
• Connect the solar panel second
• Connect the load last

Recommended disconnection order:

• Disconnect the solar panel first
• Disconnect the battery after the solar panel has been isolated

For permanent, vehicle, marine or higher-current installations, use a qualified installer.

Frequently Asked Questions (FAQs):

Is this a Maximum Power Point Tracking solar controller?

No. This is a Pulse Width Modulation solar charge controller.

Can I use this with a 12V battery?

Yes. It is compatible with 12V lead-acid solar battery systems where the battery type and charging settings are suitable.

Can I use this with a 24V battery system?

Yes. It supports 12V and 24V direct current systems with automatic voltage identification.

What battery types does it support?

It is suitable for lead-acid battery types including Open, AGM and Gel batteries.

Can I use this with lithium batteries?

Lithium battery compatibility is not verified. Do not use it with lithium batteries unless the battery manufacturer confirms the controller settings are suitable.

Is the 40A rating for charging or load output?

The 40A rating applies to rated charging current. The rated discharge/load current is 20A.

What is the maximum solar panel voltage?

For a 12V system, the photovoltaic input voltage should be less than 25V. For a 24V system, it should be less than 50V.

Does it have USB charging?

Yes. It has dual USB output with a stated maximum output of 5V / 2A. Do not assume 2A per port unless tested or confirmed.

Is it waterproof?

No waterproof rating is specified. Install it in a dry, protected location or inside a suitable enclosure. 

Package includes: 1x

40A 12V 24V PWM Solar Charge Controller with LCD Display and Dual USB.

*Does not include solar panel, battery, inverter, wiring, fuse, circuit breaker, mounting screws, tools. The image is for illustrative purposes only. Due to variations in camera settings, lighting, manufacturing processes, monitors, and supply, colours may differ. Product appearance and specifications are subject to change without notice.

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