1、Adopt industrial micro controller, charge and discharge parameters can be adjusted. 2、Full 3-stage PWM charge management. 3、Built-in a variety of protection functions including overcurrent, short circuit, open circuit, reverse connection, etc. 4、Large screen LCD display with backlight. 5、Dual MOSFET reverse current protection, low heating production. Features: 1. Adopt industrial micro controller, charge and discharge parameters can be adjusted. 2. Full 3-stage PWM charge management. 3. Built-in a variety of protection functions including overcurrent, short circuit, open circuit, reverse connection, etc. 4. Large screen LCD display with backlight. 5. Dual MOSFET reverse current protection, low heating production.   Specification: Model (Optional) YJSS-10A YJSS-20A YJSS-30A Batt Voltage 12V/24V self-adapting Charge Current 10A 20A 30A Discharge Current 10A 10A 10A Max Solar Input <41V Equalization B01 sealed B20 Gel B03 flood 14.4V 14.2V 14.6V Floating Charge 13.7V (default, 12.7-15V adjustable)  Discharge Stop 10.7V (default, 9- 11.3V adjustable) Discharge Reconnect 12.6V (default, 11.5-13V adjustable) Standby Current <10mA USB Output 5V/2A Max Operating Temperature -35~60℃ Size 133*70*35mm / 5.2* 2.7* 1.3in Weight Approx. 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   Note:  1. The regulator is only suitable for lead-acid batteries: OPEN, AGM, GEL. Not suitable for NiMH, Li-ion or other batteries. 2. Make sure your battery has enough voltage for the controller to recognize the battery type before first installation. 3. The battery cable should be as short as possible to minimize loss. 4. The charge controller is only suitable for regulating solar modules. Never connect another charging source to it. 5. The controller will be hot when running. Please install it in a well ventilated place.