The PWM Solar Charge Controller support 12V/ 24V automatic identification for system voltage. It has different working modes and is suitable for both home and commercial use. Note: Size and color may be slightly different because of manual measurement and different light conditions. Thanks for understanding. Specifications: Rated Current (Charging/ Load): 40A/ 50A/ 60A/ 80A (Optional) Color: Black Material: ABS #43; Aluminum Alloy Display: Digital LCD Screen System Voltage: 12V/ 24V Auto Charging Mode: PWM Overload Protection: 1.25 x Rated Current, 60S; 1.5 x Rated Current, 5S Short Circuit Protection: 3 x Rated Current No-load Loss: 15mA Charge Loop Drop: 0.26V Discharge Loop Drop: 0.15V Over-voltage Protection: 17V; x2/24V Working Temperature: -35~55 Boost Charging Voltage: 14.6V; x2/24V Direct Charging Voltage: 14.4V; x2/24V Float Charging Voltage: 13.6V; x2/24V Charging Recovery Voltage: 13.2V; x2/24V Temperature Compensation: -5mv//2V Under-voltage Voltage: 12.0V; x2/24V Over-discharge Voltage: 11.1V; x2/24V Over-discharge Recovery Voltage: 12.6V; x2/24V Item Size: 190 * 130 * 60mm / 7.48 * 5.12 * 2.36in Installation Size: 178 * 97mm / 7.01 * 3.82in Package Size: 21 * 14 * 7cm / 8.27 * 5.51 * 2.76in Package Weight: 612g / 1.35lbs Package List: 1 * PWM Solar Charge Controller 1 * User Manual (English)