1. Overview and Introduction
The Dyness 40A MPPT Solar Charge Controller is designed to efficiently manage power flow from your solar panels to your battery system. It features advanced Maximum Power Point Tracking (MPPT) technology to maximize energy harvest and comprehensive protection features for system safety.
Advanced Tracking Technology
This controller utilizes advanced MPPT technology, boasting a high tracking efficiency of up to 99% and a peak conversion efficiency of 98%. It continuously tracks the solar array's maximum power point to ensure the maximum amount of power is delivered to charge the battery, even in variable light conditions such as cloudy environments.
Powerful All-Around Protection
The Dyness MPPT Controller integrates a full suite of battery protection features, including: Over-charge/discharge, PV over-voltage, short-circuit, and overheating protections. These safeguards ensure worry-free and secure charging. Internal cushioning material is incorporated to minimize damage to the controller from vibrations, making it suitable for mobile applications like caravans.
12V/24V Auto-Recognition
The controller automatically recognizes 12V/24V DC voltage systems. For Lithium batteries, manual parameterization is required. It supports various battery types, including AGM, GEL, Flooded, and Lithium batteries.


2. Setup and Installation
Proper installation is crucial for the safe and efficient operation of your solar charge controller. Always ensure all power sources are disconnected before beginning installation.
Component Identification

Wiring Diagram
Follow the wiring sequence carefully to prevent damage to the controller or battery. Connect the battery first, then the solar panels, and finally any DC loads.

3. Operating Instructions
The Dyness MPPT Solar Charge Controller offers both an intuitive LCD screen interface and a smart mobile application for monitoring and control.
LCD Screen & LED Indicators
The controller features an LCD screen that displays real-time system operation information. Four buttons allow navigation through menus and parameter adjustments. Multiple LED indicators provide quick visual feedback on the status of the solar panel array, battery, loads, and controller.
Smart APP for Real-Time Monitoring
Connect your mobile phone via the built-in Bluetooth 5.0 module or through the RJ12 port (RS485 cable included). The "ChargePro" APP enables remote monitoring of solar panels, batteries, and loads in real-time, along with easy parameter adjustments.



4. Maintenance
To ensure the longevity and optimal performance of your Dyness MPPT Solar Charge Controller, regular maintenance is recommended:
- Inspect Connections: Periodically check all wiring connections to ensure they are tight and free from corrosion. Loose connections can lead to power loss or overheating.
- Clean Unit: Keep the controller's exterior clean and free from dust and debris. Ensure ventilation openings are not obstructed to allow for proper heat dissipation.
- Environmental Check: Verify that the installation environment remains within the recommended temperature and humidity ranges.
- Software Updates: Check the "ChargePro" app or Dyness website for any available firmware updates for your controller to ensure you have the latest features and bug fixes.
5. Troubleshooting
If you encounter issues with your Dyness MPPT Solar Charge Controller, consider the following basic troubleshooting steps:
- No Display/Power: Check battery connections and ensure the battery voltage is within the controller's operating range. Verify all fuses and circuit breakers are intact.
- No Charging: Confirm solar panel connections are secure and panels are receiving adequate sunlight. Check for any shading on the panels. Ensure the battery type is correctly configured in the controller settings or via the app.
- Overheating: Ensure the controller has sufficient ventilation and is not installed in an enclosed space without airflow. Reduce load if necessary.
- Error Codes: Refer to the "ChargePro" app or the controller's manual for specific error codes displayed on the LCD screen and their corresponding solutions.
- Inaccurate Readings: Ensure all sensors (e.g., temperature sensor) are correctly connected and functioning.
6. Specifications
Detailed technical specifications for the Dyness 40A MPPT Solar Charge Controller (Model ARM24V-40A):
- Display Type: LCD
- Manufacturer: Dyness
- Product Dimensions: 10.09 x 7.08 x 3.24 inches (10.09"L x 7.08"W x 3.24"H)
- Item Weight: 4.4 pounds
- Item Model Number: ARM24V-40A
- Batteries Required: No
- Included Components: User Manual
- Color: Black
- Voltage: 24 Volts (DC)

7. Warranty and Support
Dyness is committed to providing excellent customer service and support for your product.
After-Sales Service
Dyness offers professional technical support and online customer service with a fast response time within 24 hours. Should you encounter any product-related issues or have questions, please do not hesitate to contact the Dyness support team directly. They are available to assist you.






