Greatwatt has 4 advanced technologies which are unique in the world: 1. One unit can output 12V and 24V DC (Smart voltage switch, it can output two voltage, from 12V to 24V or from 24V to 12V). 2. Can start to charge in 2.5m /s wind speed (Extraordinary charge controller). 3. 6Kg =600W Small size can output more power. 4. Carbon Fiber blades = High Strength |