The MPPT 12VDC Solar Lithium Battery Charging Module (CN3791) is a high-efficiency, precision solar charging controller engineered for reliable lithium battery charging in off-grid and renewable energy applications across Bangladesh. Designed with advanced Maximum Power Point Tracking (MPPT) technology, this compact module intelligently extracts maximum power from 12V solar panels, significantly improving charging efficiency compared to traditional linear chargers. It is optimized for charging 3.7V single-cell lithium-ion or lithium-polymer batteries, making it ideal for solar IoT devices, outdoor sensor nodes, portable systems, and DIY renewable energy projects.

The onboard CN3791 controller automatically adjusts operating points based on sunlight intensity, ensuring stable, safe, and fast charging in varying environmental conditions. Equipped with JST-PH2.0 connectors, the module offers easy plug-and-play integration with solar panels and lithium batteries. Built-in protection features include overvoltage safeguards, soft-start design, trickle charging for deeply discharged cells, and automatic recharge activation. With compact dimensions, low heat generation, LED charging indicators, and adjustable current settings up to 2A, this MPPT charging module provides a reliable and efficient power solution for modern solar-powered electronics in Bangladesh.

Features:

• MPPT technology for maximum solar energy extraction from 12V solar panels

• Optimized for charging 3.7V single-cell lithium-ion and lithium-polymer batteries

• Adjustable charging current up to 2A using an external resistor

• Constant-voltage 4.2V charging with precision control

• Soft-start function prevents sudden current surges

• Automatic recharge function when battery voltage drops

• Trickle charge mode for deeply discharged batteries

• Overvoltage and stability protection for long-term reliability

• Onboard LED indicators for charging and charge-complete status

• Pre-soldered JST-PH2.0 connectors for easy plug-and-play installation

• Compact design suitable for IoT, remote sensors, and portable solar systems

How to Use:

• Connect a 12V solar panel or DC supply to the module’s input JST-PH2.0 connector

• Attach a 3.7V lithium battery to the output connector

• Allow the MPPT controller to auto-optimize charging based on sunlight conditions

• Monitor LED indicators: one for charging status and one for charge completion

• Adjust the charging current using an external resistor if higher or lower current is needed

• Mount the module in a dry environment with proper airflow

• For maximum efficiency, place the solar panel under direct sunlight

Product Instructions:

• Ensure correct polarity when connecting solar panel and battery

• Do not use with batteries other than 3.7V lithium-ion or lithium-polymer

• Avoid exposure of the module to moisture or direct rain

• Confirm the solar panel voltage does not exceed recommended levels

• Refrain from short-circuiting the output terminals

• Install in a ventilated area to maintain safe operating temperature

Specifications:

• Input Voltage: 12V DC (suitable for 12V solar panels)

• Charging Voltage (CV): 4.2V

• Maximum Charging Current: 2A (externally adjustable)

• PWM Switching Frequency: 300 kHz

• Battery Interface: 2-pin PH2.0/JST connectors

• Operating Temperature: -25°C to +85°C

• Operating Humidity: 5%–95% RH

• Module Dimensions: 45 × 20 × 9 mm

Package Includes:

• 1 × CN3791 MPPT Lithium Battery Charging Module

• 2 × PH2.0/JST Connection Cables

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