Solar Lamp Controller 3.7V MPPT Lithium Battery Charging Module with Switch Overview This compact control board combines MPPT charging, battery management for 3.7V lithium cells, and a manual switch to simplify solar lamp installations and DIY solar projects. It optimizes solar panel input to charge a singlecell lithium battery while providing convenient load control. Key benefits Improved charging efficiency: MPPT tracking extracts more usable power from a solar panel compared with basic chargers, increasing effective charge under variable light conditions. Designed for 3.7V lithium batteries: Built specifically for singlecell lithium battery systems, making it easy to integrate with common 3.7V cells. Integrated load control: The onboard switch lets you turn the lamp or load on and off without extra wiring or external switches. Compact and easy to install: PCB form factor fits small housings and garden light assemblies for quick retrofit or builds. Reliable daytoday operation: Manages charging and load switching automatically to maintain operation with standard solar lighting setups. Function and performance MPPT charge control improves the conversion of solar panel output into battery charge current under changing sunlight. Charging module is tuned for a nominal 3.7V lithium cell, handling the charge management tasks required for solar lamp applications. The control board provides a simple interface for solar panel input, battery connection, and load output, including a useraccessible switch for manual control. Compatibility Intended for use with singlecell 3.7V lithium batteries. Compatible with small solar panels sized for 3.7V charging systems commonly used in solar lamps and portable lighting. Suitable for retrofit projects and assemblies using the same voltage battery chemistry. Form factor and materials Compact printed circuit board design for installation inside lamp housings and DIY enclosures. Standard electronic components and connectors for straightforward wiring and mounting. No external bulky modules required, keeping assemblies neat and compact. Practical applications Solar garden or pathway lights: or upgrade existing controllers to improve charging efficiency and add a simple manual on off option. Portable solar lanterns: Integrate the module to manage charging and control the light from a singlecell lithium battery. DIY outdoor lighting projects: Use the board to build small offgrid light fixtures that need efficient solar charging and easy load switching. What to expect A dedicated MPPT charging module for singlecell 3.7V lithium systems that simplifies wiring, improves solar charging performance, and provides convenient load control via an onboard switch. Ideal for solar lamps, portable lanterns, and small solar lighting projects where efficient charging and compact form factor matter.