1. Built-in LED constant current source. 2. With intelligent four phases PWM digital dimming.(power is 100%,75%,50%,25%) 3. IP68 waterproof degree. 4. The max output voltage is 70V, which can drive 20 LED lamps installed in series 5. Various protections. Specification: System voltage: 12V/24V Auto Output current: 330mA ¨C 2310mA No-load loss: 5mA/12V;7mA/24V Solar input voltage: < 55V The Max. charging current: 8A Overvoltage protection: 17.0V; 2/24V Equal charging voltage: 14.6V; 2/24V(25), duration:1h Ascending charging voltage:14.4V; 2/24V(25), duration:2h Float charging voltage: 13.8V; 2/24V (25) Return voltage during charging:13.2V; 2/24V (25) Return voltage for over-discharging:12.5V; 2/24V Over-discharging voltage:11.1V; 2/24V Temperature compensation :-4.0mv//2V; Light-control voltage :Light-control open 5V; light-control close 6V Efficiency of constant current:90% - 96% Current accuracy:+/-2% Light-control judgment time :10min The Max. output voltage:70V Working temperature:-40 to +70; Protection level:IP68 Weight :160g Dimensions ; 825820(mm)(LWH). Package:1pc/box;54pcs/ctn Size: 280*280*220mm.