CN3791 9V MPPT Solar/Wired Lithium Battery Charger – 3.7V/4.2V Output
This MPPT charging module is designed to charge a single-cell 3.7V lithium-ion (Li-ion) battery from a 9V solar panel or 9V DC power source. Powered by the CN3791 controller chip, it uses Maximum Power Point Tracking (MPPT) to maximize energy conversion—ideal for solar charging where light conditions vary.
Simply connect your 9V input (solar or DC) to the input terminals and your battery to the output. Compact and efficient, this board is great for solar-powered projects, backup battery systems, or portable electronics.
Features & Specifications:
- Input Voltage: 9V (compatible with 9V solar panels or DC adapters)
- Output Voltage: 4.2V (for 3.7V Li-ion batteries)
- Charging Current: Up to 2A
- Charging Method: MPPT (Maximum Power Point Tracking)
- Battery Support: Single-cell 3.7V lithium-ion battery
- Charge Status Indicators: Built-in LEDs (charging/full)
- Safety Features: Battery overvoltage protection, soft start
- Recharge Functions: Trickle charge for deeply discharged batteries, automatic recharge
- Switching Frequency: 300kHz (PWM)
- Connectors: 4x 2-pin JST/PH2.0
- Operating Temperature: -40°C to +85°C
- Dimensions: 45 x 20 x 9.5 mm
Note:
- This version is for 9V input only.
- Allow 1–3 mm variation due to manual measurement.
- Actual color may vary slightly based on monitor settings.
