... 50kw, then is 5m/s. Annual wind power utilization in a general wind field is 50%, a better wind field is around 70%. Most of ... produce and sell small and medium-sized vertical wind turbines of different sizes, like 2KW,3KW,5KW,10KW,20KW,30KW,50KW and ... where they are rich of wind energy and where the electricity grid is hard to reach, like various islands, grassland, farm, fish ...