Supports MPPT (Maximum Power Point Tracking) to significantly enhance solar conversion efficiency Supports multiple charging methods including solar panels and Type-C power adapters Compatible with 6-24V solar panels, featuring adaptive input voltage and reverse polarity protection Onboard status indicators for easy monitoring of solar panel and battery conditions Integrated protection circuits including overcharge, over-discharge, overtemperature, and overcurrent protection Parameter: A power management module for 6-24V solar panels, supporting charging of 3.7V rechargeable lithium batteries via solar panels or Type-C interfaces. Provides stable 5V/3A output (supporting multiple protocols including PD/QC/FCP/PE/SFCP), incorporates MPPT power point tracking and multiple protection circuits. Operates efficiently, stably, and safely, suitable for solar power generation, low-power IoT, and other eco-friendly projects. Product Parameters: Solar Panel Input Voltage: 6-24V Charging Methods: Solar Panel, Power Adapter, USB Lithium Battery Specification: 3 x 18650 cells (not included in shipment) USB Input Voltage: 5V (Type-C port, supports PD fast charging protocol) Power Output: 5V/3A (Type-C port, terminal blocks) Charge Cut-off Protection Voltage: 4.2V ±1% Over-Discharge Protection Voltage: 3.0V ±1% Solar Panel Charging Efficiency: Approx. 78% USB Charging Efficiency: Approx. 93% Battery Boost Output Efficiency: Approx. 90% Quiescent Current (Max): <30mA Color: As Shown Material: Plastic+Metal Package Contents: 1 motherboard, 1 battery box Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.