Specification: Item Type: Solar Charge Controller Material: ABS Color: Black Charging Type: PWM USB: 5V/1A (1pcs) Rated Current: 20A System Voltage: DC 12V/24V automatic identification No-Load Loss: ＜10mAh/12V; ＜12mAh/24V Solar Input Voltage: < 55V Maximum Allowable Voltage Of Battery Terminal: < 35V Overpressure Protection: 17.0V; x2/24V Balanced Charging Voltage: 14.6V; x2/24V Lifting Charging Voltage: 14.4V; x2/24V Floating Charging Voltage: 13.8V; x2/24V Charging Return Voltage: 13.2V; x2/24V Overdischarge Return Voltage: 12.6V; x2/24V Overdischarge Voltage: 11.1V; x2/24V Balanced Charge Interval: 30 days Balanced Charging Time: 1H Lifting Charging Time: 2H Temperature Compensation: -3.0mV/℃/2V Photocontrol Voltage: Photocontrol open 5V; X2/24V; Photocontrol close 6V set value plus 1V Photocontrol Judgment time: 1 minute Operating Temperature: -25℃ - +55℃ Protection Level: IP30 Applicable Scenarios: Home power generation, base station, rv, yacht, ship and other solar photovoltaic systems Package List: 1 x Solar Charge Controller1 x Manual Note: This model can only be used on sealed batteries, not other types of batteries.