Features:High quality, waterproof PWM solar charge controller, ideal for extreme environments. IP67, waterproof, suitable for outdoor and marine use. Electronic protection features, overcharging, overdischarging, overload, short circuit and reverse protection of solar modules. Efficient digital PWM charging helps protect battery life. The load power output can be configured to automatically recognize day and night, so solar lighting can be turned on automatically at dusk. Battery LED status. Built-in temperature sensor. Specifications:Condition: 100% Brand NewMaterial: Aluminum AlloyType: ST-F 12V30A, ST-F 12V20A, ST-F 12V10A (Optional)Weight: approx. 348g / 12.3ozSize:20A: approx. 10.3*10*3.1cm / 4.1*3.9*1.2in10A 20A 30A To adapt to the battery voltage 12V/24V(Battery < 6V: 12V system battery > 18V: 24V system) Rating charger voltage 12V: Open loop voltage 18-24V standard specification solar panel (24V battery-2) Rating charger current 10A 20A 30A Rating output current 10A 20A 30A Maximum output current 10A 24A 35A Short circuit protection Three times the rated short circuit current fast protection Rating charger voltage 14.2V(24V battery * 2) Under-voltage protection voltage 10.5V (24V battery * 2) Owe pressure recovery voltage 12.5V (24V battery * 2) Load overload automatic recovery time 30s Waterproof level IP67 Stand-by power consumption < 20mA Installation of fixed size - 91mm*55mm 91mm*75mm Package list:1 * Controller1 * Instruction manual