Specification: Item Type: PWM Solar Power Controller Material: ABS Weight: Approx. 202g/7.13oz Size: 12.5x10x3cm/4.92x3.94x1.18in Model: K1688 System Voltage: 12V 24V automatic adaptation Maximum Photovoltaic Voltage: 23V(12V), 46V (24V) Lifting Charge Voltage: 14.4V (12V), 28.8V (24V) Float Charging Voltage: 13.7V (default, adjustable) (12V), 27.4V (default, adjustable) (24V) Discharge Cut Off Voltage: 10.7V (default, adjustable) (12V), 21.4V (default, adjustable) (24V) Discharge Recovery Voltage: 12.6V (default, adjustable) (12V), 25.2V (default, adjustable) (24V) Charging Recovery Voltage: 13V (12V), 26V (24V) Light Control Light On Threshold: 8V for photovoltaic panel (with delay) (12V), 16V for photovoltaic panel (with delay) (24V) Light Control Light Off Threshold: 8V for photovoltaic panel (with delay) (12V), 16V for photovoltaic panel (with delay) (24V) USB Output: Dual USB output, 5V 2.5A (maximum) Standby Current:<10mA Working Temperature: -35-+60℃ Purpose: Solar Energy Control Package List: 1 x PWM Solar Power Controller 1 x Instruction   Features High Accuracy Chip: The controller is equipped with industrial grade master chip. Charge and discharge parameters can be adjusted. Support light control and delay control. Large LCD Display: All kinds of data are clear at a glance for easy inspection by the users. The temperature, charging current and discharge current, accumulated electricity generated and discharged are clear. Dual USB Output: The Solar charge controller is equipped with dual USB output interfaces, with a maximum current of 2.5A, which supports the charging of phones. Protection Functions: Built in over current, short circuit protection, open circuit protection, reverse connection protection are all self recovery type, without damaging the controller. Anti backflow circuit and ultra low heat. Wide Application: The solar controller can be widely used for various applications, e.g. solar RV, household system and industrial field monitoring, etc.