Specifications: It adopts industrial-grade main control chip. The controller has high clarity display with dual USB charging function. Built-in over-current/short-circuit protection, open-circuit protection, and reverse connection protection, all of which are self-healing and do not damage the controller. Item Name: Solar Charge Controller System Voltage: 12V-24V Rated Charging Current: 10A, 20A, 30A Rated Discharge Current: 10A, 10A, 10A Maximum Photovoltaic Voltage: 23V for 12V Battery, 46V for 24V Battery Charging Cut-off Voltage: 14.4V (B1) 12.6V (B2) 14.6V (B3) Discharge Cut-off Voltage: 10.7V (B1) 9V (B2) 10V (B3) Discharge Recovery Voltage: 12.6V (B1) 10.5 (B2) 12V (B3) Light-Controlled Turn-on Threshold: PV Panel 8V (Light-Controlled Turn-on Has A Delay) Light Control Light Off Threshold: PV Panel 8V (Light Control Light Off Has A Delay) USB Output: 2 USB Outputs, 5V/2.5A (Maximum) Standby Current: < 10mA Material: ABS Working Temperature: -35 to 60 Degree Celsius Size: 13.35cm x 7cm x 3.5cm/5.26" x 2.76" x 1.37" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Solar Charge Controller 1 x User Manual