Maximize your solar panel's efficiency with MPPT (Maximum Power Point Tracking).Multiple protection circuits ensure safe and stable operation: overcharge, over-discharge, reverse polarity, overheating, and overcurrent protection.Supports solar panel or USB connection for battery charging.Designed for 6V~24V solar panels with DC-002 jack or screw terminal input.Features a built-in MPPT SET switch to optimize charging efficiency based on input level.Dual 5V output interfaces: pin headers and USB port.Includes high-performance aluminum electrolytic capacitor and SMD ceramic capacitor for reduced ripple and stable performance.Equipped with 14500 battery holder and PH20 battery connector for various 3.7V Li-battery types.Multiple LED indicators monitor solar panel and battery status.This solar power module is designed for 6V~24V solar panels and can charge 3.7V Li-batteries via solar panel or USB.Provides a regulated 5V/1A output.Ideal for solar-powered projects, low-power IoT devices, and other eco-friendly applications.Solar Panel Input Voltage (SOLAR IN): 6V~24VUSB Input Voltage (USB IN): 5VPin Header / USB Output (USB OUT): 5V 1ACharging Cut-off Voltage: 4.2V1%Over-Discharge Protection Voltage: 2.9V1%Solar Panel Charging Efficiency: ~78%USB Charging Efficiency: ~82%3.7V Battery Boost Output Efficiency: ~86%Max Quiescent Current: Less than 2mAOperating Temperature: -40~85Dimension: 65.2mm x 56.2mm x 22.9mmNote: 14500 battery is NOT included.