Features Using industrial microcontroller, charging and discharging parameters are adjustable. Large-screen LCD display with backlight. Full 3-stage PWM charging management. Built-in overcurrent, short circuit, open circuit, reverse connection and other protection functions. Double MOSFET reverse current protection, low heat generation. Features: -Using industrial microcontroller, charging and discharging parameters are adjustable. -Large-screen LCD display with backlight. -Full 3-stage PWM charging management. -Built-in overcurrent, short circuit, open circuit, reverse connection and other protection functions. -Double MOSFET reverse current protection, low heat generation.   Specification: Model ( Optional )YJSS-10AYJSS-20A YJSS-30A Batt Voltage12V/24V self-adaptingCharge Current10A20A30ADischarge Current10A10A10AMax Solar Input<41VEqualizationB01 sealedB20 GelB03 flood14.4V14.2V14.6VFloating Charge13.7V (default, 12.7-15V adjustable) Discharge Stop10.7V (default, 9-11.3V adjustable)Discharge Reconnect 12.6V (default, 11.5-13V adjustable)Standby Current <10mA USB Output5V/2A MaxOperating Temperature-35~60℃Size133*70*35mm / 5.2*2.7*1.3inWeightApprox. 148g / 5.2oz Tips: All red voltage is only for 12V system, please double it while using 24V system.   Package list: 1 * Solar Charge Controller 1 * Manual   Package List