System voltage: 12/24V Maximum voltage of solar panels: 50V Own working current: ≤15mA Maximum charging current: 40A LVD:10.7V 9V..12Vx2 24V LVR:12.6V/11V..13.5Vx2 24V Holding voltage: 13.6V/13V..15Vx2 24V Overcharge protection: 16.5Vx2 for 24V Reverse Polarity Protection: Yes Charging mode: PWM Temperature compensation: -24mV/C for 12V installation; x2 for 24V Operating temperature: -35 to +60°C Wiring cross-section: 28-10AWG Dimensions: 187x98x50mm Weight: 370g USB: 2x built-in 5V/2A USB port