Features: 100% brand new and high quality Always keep the battery on full voltage condition. Prevent the battery from over-charging. Prevent the battery from over-discharging. Prevent the battery from reverse charging to solar panels during nights. Reverse Polarity Protection for Battery Reverse Polarity Protection for Solar Panels When the battery voltage is low the controller will automatically cut off the load from the system. If the voltage of battery is back to normal and the load will restart working. According to the battery voltage grade the controller can automatically set charge-off voltage the load-off voltage the load- restore voltage. (The parameter is default under 25C condition.) The controller will automatically compensate the temperature of the charging voltage according to the changes of ambient temperature. Protections: Over-charging protection Over-discharge Protection Over-load protection Under-voltage protection Short-circuit protection Reverse-polarity protection Specifications: Rated Voltage: 12V/24V Automatic voltage recognition Max. Charge Current: 25A Max. Discharge Current: 25A Full Charge Cut: 13.7V/27.4V Low Voltage Cut: 10.5/21V Low Voltage Restore: 12.6V/25.2V Temp compensation:-3mv/C/cell Static Current: 45mA Voltage Drop:!#!lt!*!220mv Wire area max. : 10mm 2; Size: 164*110*48.5mm Color: Gray Package includes: 1 x Solar Controller