1. Introduction
This manual provides essential instructions for the safe and efficient operation of your Sunthysis MPPT Solar Charge Controller, Model MPJ. This device is designed to manage power flow from your solar panels to your battery bank, ensuring optimal charging and system protection. It automatically detects 12V or 24V DC system voltages and is compatible with various battery types, including AGM, Gel, Sealed, Flooded, and Lithium batteries.
2. Product Overview
2.1 Key Features
- Advanced MPPT Technology: Utilizes a new Maximum Power Point Tracking algorithm for high tracking efficiency (up to 99.5%) and conversion rate (up to 98%), optimizing power output from solar panels even in varying light conditions.
- Comprehensive Protection System: Features multiple layers of protection including PV array short circuit, PV overvoltage, PV overcurrent, load overload, load short circuit, temperature protection, battery overvoltage/overdischarge protection, and reverse polarity protection.
- Intelligent 4-Stage Charging: Supports Bulk Charge, Boost Charge, Float Charge, and Equalization Charge stages. Includes a lithium battery activation function to recover deeply discharged lithium batteries.
- Practical Functionality: Automatic detection of 12V or 24V DC system voltage, clear LCD display for system status, dedicated load terminal for DC power connection, and programmable load timer modes.
- Integrated Connectivity: Built-in Bluetooth module for wireless connection to the Sunthysis Scontroller APP for monitoring and settings adjustment. Equipped with two USB output ports for charging mobile devices.
2.2 Controller Components
The Sunthysis MPPT Solar Charge Controller features a user-friendly design with an integrated LCD and control buttons for easy interaction.

Front view of the Sunthysis MPPT Solar Charge Controller, showcasing its integrated LCD screen, control buttons, and USB charging ports.

A comparison image emphasizing the Sunthysis controller's built-in Bluetooth and dual USB output ports for convenient device charging.
3. Setup and Installation
3.1 Safety Precautions
- Ensure all power sources are disconnected before installation.
- Use appropriate tools and wear protective gear.
- Verify correct polarity for all connections to prevent damage.
- Install the controller in a well-ventilated area, away from direct sunlight and moisture.
3.2 Wiring Sequence
Follow the correct wiring sequence to ensure safe and proper operation:
- Connect the Battery: First, connect the battery to the controller's battery terminals. Ensure correct polarity (+ to + and - to -). The controller will automatically detect the system voltage (12V or 24V).
- Connect the Solar Panel: Next, connect the solar panel array to the controller's PV terminals. Ensure correct polarity.
- Connect the DC Load: Finally, connect your DC loads to the controller's load terminals. Do not exceed the maximum rated current for the load output.
Warning: Connecting the solar panel before the battery, or connecting the load before the battery, may damage the controller.
3.3 Battery Type Selection
The controller supports various battery types. You can select the appropriate battery type (e.g., Lithium, Sealed, Flooded, Gel, AGM) through the controller's settings menu or via the Sunthysis Scontroller APP. Refer to the 'Operating Instructions' section for details on using the APP.

An overview of the controller's intelligent 4-stage charging process and its compatibility with various battery types, with automatic 12V/24V system identification.
4. Operating Instructions
4.1 LCD Display
The integrated LCD screen provides real-time information about your solar system, including:
- PV (Solar Panel) voltage and current
- Battery voltage and charging current
- Load status and current
- System voltage (12V/24V)
- Battery state of charge
- Error codes or warnings
4.2 Control Buttons
The controller features intuitive buttons for navigation and settings adjustment. Typically, these include an 'Up', 'Down', and 'Enter' button to cycle through display screens and modify parameters.
4.3 APP Monitoring and Settings (Bluetooth)
The Sunthysis MPPT Solar Charge Controller includes a built-in Bluetooth module, allowing you to monitor and configure your system wirelessly via the Sunthysis Scontroller mobile application.
- Download the APP: Search for "Sunthysis Scontroller" in your device's app store and install it.
- Enable Bluetooth: Ensure Bluetooth is enabled on your mobile device.
- Connect to Controller: Open the APP and follow the on-screen instructions to connect to your Sunthysis controller.
- Monitor and Adjust: Once connected, you can view real-time data, change battery type settings, adjust load timer modes, and access other advanced parameters.




