This controller is a kind of intelligent, multi-purpose solar charge and discharge controller. These series products adopt LCD display, which makes the operation on the interface rather convenient. All the controlling parameters can be reset flexibly to satisfy your different needs.   Features: LCD display, brief key operation, very convenient.  PWM charge mode can improve system efficiency and prolong the life span of the battery.  Automatic indentification system voltage level, automatic temperature compensation.  Adjustable charge-discharge control parameters, settable operating modes of loads.  Over-load/short-circuit protection, battery reverse-discharge/reverse connection protection.  Battery low voltage disconnection(LVD).  Accumulated function of charge and discharge ampere hours.  Suitable for street and pathway lighting, parking area, bus station, etc.   Specifications: Color: Black;  Material: Plastic;  Rated Voltage: 12V / 24V Automatic;  Rated Current: 30A / 50A (Optional);  Voltage of Solar Panels: ≤50V;  Float Charging Voltage: 13.7V / 27.4V;  Low Voltage Protection: 10.7V /21.4V;  Low Voltage Recovery: 12.6V / 25.2V;  No Load Loss: ≤10mA;  Loop Voltage Drop: ≤170mV;  Temperature Compensation: -4mV/Cell/°C;  Working Temperature: -20~60°C;  Storage Temperature: 30~70°C;  Humidity: ≤90%, no condensation;  Item Size: 30A: 185 * 90 * 45mm / 7.28 * 3.54 * 1.77in;  50A: 185 * 125 * 60mm / 7.28 * 4.92 * 2.36in;  Item Weight: 30A: 350g / 12.35oz; 50A: 592g / 20.89oz;  Package Size: 30A: 20 * 10.5 * 6cm / 7.87 * 4.13 * 2.36in;  50A: 21 * 15 * 9cm / 8.3 * 5.9 * 3.54in;  Package Weight: 30A: 446g / 15.75oz; 50A: 765g / 26.99oz;   Package List: 1 * Solar Charge Controller;  1 * Temperature Probe;  1 * User Manual