Features Multiple management functions: The charging module uses high-end technology MPPT solar maximum power tracking charging management chip, with trickle, constant current, and constant voltage charging management functions Resistance detection: solar panel controller charging module adopts imported high-frequency low-pass internal resistance double MOS tube, high-current diode, high-efficiency flat high-power inductor, alloy current detection resistor Large-size aluminum heat sink: The controller charging module base adopts an over-size aluminum heat sink to ensure long-term stable operation of high current Dual status indicator lights: 3A controller charging module has a high-speed and efficient charging mode. And designed dual status indicator lights, the red light flashes green when there is no battery, the red light is on when charging, and the green light is on at the same time when it is fully charged Voltage parameters: Input voltage of solar panel controller charging module is 12V, output voltage is nominal 3.7V, full junction voltage is 4.2V, charging current is 3A Features: 1. High-end technology MPPT solar maximum power tracking charging management chip, with trickle, constant current, constant pressure charging management function. 2. Adopt imported high-frequency low-pass internal resistance double MOS tube, high-current diode, high-efficiency flat high-power inductance, Alloy current detection resistance 3. The base uses oversize aluminum heatsink to ensure long time stable operation of high current. 4. High-speed and efficient charging mode. 5. Dual status indicator, no battery when the red light flashing green light, charging when the red light is bright, full of self-stop at the same time green light.   Specification: Condition: 100% Brand New Model: CN3791 Input Voltage: 12V Output Voltage: Nominal 3.7V, Full Junction Voltage: 4.2V Charging Current: 3A Wiring Mode: Welding Weight: Approx. 12g / 0.4oz Size: Approx. 31 * 49mm / 1.2 * 1.9oz   Package List: 1 * Solar Panel Controller Charging Module Package List