CN3791 MPPT Solar Charger Module 12V Input Lithium-ion (3.7V/4.2V) Battery Charging Controller with JST

The MPPT Solar Charger Module CN3791 with JST PH 2.0 is a high-performance PWM switch-mode battery charger controller specifically designed for single-cell Lithium-ion (Li-ion) and Lithium Polymer (LiPo) batteries. Built around the CN3791 IC, this module features advanced Maximum Power Point Tracking (MPPT) logic that allows it to extract the maximum available energy from solar panels, even in fluctuating light conditions. This specific version is optimized for 12V nominal solar panels (with an input range of 5V-18V), converting the solar energy into a precision-regulated 4.2V charge.

The module implements a complete charging cycle, including trickle charge, constant current, and constant voltage modes, ensuring the longevity and safety of your lithium cells. For electronics geeks and developers building remote IoT nodes or portable electronics, the CN3791 offers superior efficiency over traditional linear chargers by preventing panel voltage collapse during peak loads. Its compact design makes it an ideal power management solution for off-grid gadgets requiring a stable 3.7V/4.2V power source.

Why Choose MPPT Over Standard Chargers?

Most DIY solar projects fail because they use standard linear chargers (like the TP4056) which cause solar panel voltage to collapse. The CN3791 uses Maximum Power Point Tracking to maintain panel stability and maximize energy yield.