The above system voltage is 12V of the lead-acid battery. lf the system voltage is 24V, the value is x2 Rated Current: 30A Rated Discharge Current: 30A System voltage: 12V/24V Auto Maximum PV open circuit voltage: Less than 50V Charging control mode: PWM Battery Type: GEL/SLD/FLD/LITHIUM Batteries/Customization USB Port: 5V2A Load disconnection: 11V(Can set) Load reconnection: 12.6V(Can set) Float charge: 13.8V(Can set) Battery overvoltage: 16.5V Temperature Compensation: -24mV/C for 12V system Working temperature range: -20℃-+55℃ Wiring: 28-10 AWG Product size: 155x144x43mm (6.1x5.67x1.69in) Colour:Blue Material:ABS Package Contents: 1 * 30A Solar Charge Controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.