Features:  Automatic identification for system voltage: 12V/ 24V. The solar controller is suitable for various specifications of solar panel, applicable to both home and commercial use.  Uses brand new electronic components and advanced chip, features stable performance and low error rate.  Different working modes facilitate the solar controller's application to different types of load, such as streets lights and monitoring devices.  PWM charging mode improves charging efficiency than ordinary solar controllers and the battery being charging is not easy to get damaged.  Multiple protections provide safe use, such as over-charge, over-discharge, overload protection, as well as short circuit and reverse polarity protection.  Easy-to-read LCD screen and user-friendly operating keys ensure convenient and intuitive operations.  With temperature compensation employed, charging parameters can be automatically adjusted.  Selected ABS casing is wear-resistant, anti-impact and weather resistant; aluminum alloy heat sink provides rapid heat dissipation to prolong service life.  5V USB output interface for easily charging smart phone or other electronic devices.    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 + 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)