CN3791 MPPT Solar Charge Controller Module for 3.7V Lithium Battery, 12V Panel Compatible

CN3791 MPPT Solar Charger Module for 3.7V 4.2V Lithium Batteries, Compatible with 12V Solar Panels Overview A compact MPPT solar charge controller designed to charge singlecell lithium batteries (3.7V nominal, 4.2V full charge) from small 12Vclass solar panels. The CN3791 module maximizes usable solar power and delivers a stable regulated charge without requiring a larger charge controller. Key benefits Better solar harvesting: Builtin MPPT tracking extracts more energy from a 12V solar panel than a simple PWM charger, especially in variable light. Proper singlecell charging: Configured for 3.7V nominal lithium chemistry with a 4.2V fullcharge endpoint to match common singlecell battery packs. Compact and easy to integrate: Small PCB form factor fits into DIY projects, portable chargers, and retrofit applications where space is limited. Simple wiring and operation: Clear input and output terminals for direct connection to a solar panel and a singlecell lithium battery. What it does Converts solar panel output into a regulated charging source optimized for singlecell lithium batteries. Uses maximum power point tracking to improve charge efficiency from a 12Vclass solar panel under varying conditions. Maintains a fixed fullcharge voltage of 4.2V appropriate for typical 3.7V lithium cells. Compatibility and specifications Model: CN3791 Battery target: Singlecell lithium battery, 3.7V nominal, 4.2V full charge Solar input: Compatible with 12Vclass solar panels Form factor: Compact PCB module suitable for embedded and DIY installations Installation and practical notes Connect the solar panel to the panel input terminals and the lithium cell to the battery output terminals following correct polarity. Mount in a protected enclosure to prevent exposure to moisture and mechanical stress. Suitable for integration into small systems where a dedicated singlecell MPPT charger is needed. Typical use scenarios Remote sensor power: Keep a singlecell lithium battery topped up for environmental sensors, weather stations, or telemetry nodes powered by a small 12V solar panel. Portable charging packs: Add an efficient solar input stage to small portable power banks or flashlight packs that use a single lithium cell. Outdoor electronics and hobby projects: Provide regulated charging for singlecell battery packs in garden lights, model boats, or offgrid monitoring devices. Why choose this module Focused design for singlecell lithium charging from 12Vclass panels makes it a convenient choice for compact solarpowered systems. MPPT tracking improves energy capture compared to nonMPPT solutions, increasing run time and reliability in realworld light conditions. Lightweight and spaceefficient module that fits into DIY enclosures and small product housings. Contents 1 x CN3791 MPPT solar charger module Note Ensure correct wiring polarity and observe basic battery handling practices when installing and using the module.