Features Automatic Current Adjustment: The output current of 6A is automatically adjusted for optimal charging performance, ensuring efficient power conversion. Excellent ABS Material: This solar charging panel is made of excellent ABS material, which is sturdy and wear resistant, not easy to be damaged, and has a long service life. Efficient Charging: This solar charging panel can charge your lithium iron batteries with high efficiency thanks to the adjustable output voltage of 4.2 to 28V. Wide Input Voltage Range: Use this solar panel controller with input voltage ranging from 8‑30V, making it suitable for various power sources. High Conversion Efficiency: With a conversion efficiency of up to 92%, this controller provides effective power transfer, reducing energy waste. Specification: Item Type: Solar Charging Board Material: ABS Input Voltage: 8-30V Output Voltage: Adjustable 4.2-28V (At Least 2V Higher Than Input) Output Current: 6A (Automatically Adjusted) Conversion Efficiency: Typical 92% (Measured With Input 18V, Output 14V) Package List: 1 x Solar Charging Board Package List 1 x Solar Charging Board