The CN3791 9V MPPT Solar Charger Module is designed for efficient charging of single-cell lithium batteries using solar panels. Built with maximum power point tracking (MPPT) technology, it ensures your solar panel delivers the highest possible efficiency when charging a LiPo cell.
With its simple design, the CN3791 9V MPPT Solar Charger Module requires only a solar panel input and a lithium battery output to begin charging. The module automatically manages charging, provides overvoltage protection, and includes indicators for charging and charge completion.
Delivering up to 2A of charging current, the CN3791 9V MPPT Solar Charger Module supports a wide operating temperature range from -40°C to +85°C, making it suitable for outdoor and rugged environments. Its compact PCB design and JST connectors allow quick integration into DIY solar charging systems.
Whether for hobby electronics, IoT devices, or renewable energy projects, the CN3791 9V MPPT Solar Charger Module offers a reliable and efficient solution for solar-powered lithium battery management.
🔧 Key Features
- Built-in maximum power point tracking (MPPT) for solar efficiency
- Automatic recharge and complete charge management
- Battery overvoltage protection with status indicators
- High-frequency PWM switching at 300 kHz
- Compact module with 2-pin JST interface
- Ideal for single-cell lithium battery charging
📐 Technical Specifications
| Model | CN3791 |
| Input Voltage | 9V DC |
| Output Voltage | 4.2V ±1% (for single-cell LiPo) |
| Maximum Charging Current | 2A |
| PWM Switching Frequency | 300 kHz |
| Connector Type | 2-pin JST (PH2.0) |
| Operating Temperature | -40°C to +85°C |
| Board Dimensions | 45 × 20 × 9.5 mm |
| Weight | Approx. 10 g |
| Protection | Overvoltage and charge management safety |
📌 Applications
- Solar-powered lithium battery charging
- IoT and wireless sensor nodes
- Portable electronics powered by LiPo cells
- DIY renewable energy projects
- Outdoor solar charging systems
💡 Why Choose This Product?
The CN3791 9V MPPT Solar Charger Module ensures maximum efficiency and safety in solar-powered charging systems. With automatic management, overvoltage protection, and easy plug-and-play connectivity, it’s an excellent choice for powering lithium batteries in solar applications.
📦 Package Includes
- 1 × CN3791 9V MPPT Solar Charger Module
- 1 × Pair of wires with 2-pin JST connector







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