MPPT Solar Charge Controller 6V 9V 12V 3A Fast Charging Module for 18650 Liion Battery

1S MPPT Solar Panel Controller CN3791 for 1S 18650 Liion Batteries Key benefits Reliable singlecell charging: Manages charging of one 3.7V Liion 18650 cell, providing a direct replacement for OEM solar charge controllers in small solar systems. MPPT charging for better harvest: Uses MPPT algorithm based on the CN3791 to optimize solar input from 6V, 9V, or 12V panels and improve energy transfer compared to basic PWM controllers. Higher charging current: Supports up to 3A charging current to reduce charge time for compatible 18650 cells while remaining suitable for small offgrid loads. Compact and easy to integrate: Small PCB module with clear input and output connection points for straightforward mounting or replacement in existing devices. What this module does and how it solves problems Converts variable solar panel voltage into a controlled charge for a single 3.7V Liion cell, preventing undercharge from mismatched panel voltages and enabling efficient use of available solar power. Replaces failed or missing OEM singlecell solar controllers to restore charging capability without redesigning the system. Helps avoid wasted energy from panels by actively tracking operating conditions and delivering steady charge current suitable for 18650 cells. Specifications and important attributes Model: CN3791 Supported solar panel input voltages: 6V, 9V, 12V Battery compatibility: 1S Liion cell, 18650, nominal 3.7V Maximum charge current: 3A Form factor: compact PCB module suitable for integration into small devices and projects Construction: standard electronic PCB with components mounted for solar charge management Compatibility notes Designed specifically for singlecell 18650 Liion batteries and common small solar panel voltages. Intended as a replacement for OEM singlecell solar charge controllers in comparable systems. Practical applications Solar garden lights and outdoor LED fixtures that use a single 18650 cell and small solar panels. DIY portable solar chargers and singlecell power banks where a compact MPPT charger improves charging efficiency. Remote sensors, small IoT devices, and batterypowered monitoring equipment that require reliable solar charging and simple replacement modules. Why choose this module Direct replacement for OEM singlecell solar charge controllers when you need a compact, MPPTbased solution compatible with 6V, 9V, and 12V panels and 1S 18650 batteries. Ideal for repairs, upgrades, and small solarpowered projects where controlled, efficient charging is required.