CN3791 6V MPPT Solar Charge Controller Module – 3.7V / 4.2V Lithium Battery Regulator (45x20x9.5mm)

This little guy is a CN3791-based MPPT solar charger module.

It takes 6V, 9V, or 12V input—perfect for small solar panels—and steps it down to charge 3.7V or 4.2V lithium batteries.

It’s tiny: 45x20x9.5mm, so it fits just about anywhere.

No brand name, but the chipset is solid.

Operating temp is -40°C to +85°C, so it’s fine for outdoor projects or enclosures.

MPPT means you’re getting real efficiency, not just a linear regulator.

No UPC or EAN, but hey—it’s a no-frills module that just works.

Great for off-grid builds, battery backups, or solar hobby projects.