I want to find out building a low speed wind turbine . How lowest speed it could be ?

Question

In my place it has unpredictable wind speed . Sometime still somtime avg 10m/s

Answer 1

a wind turbine can be designed to run at almost any speed and with almost any wind speed

it just won't be efficient or useful

you need a lot more information than in this question in order to get any useful advice

if you read this wikipedia article, you might get a start, on beginning to see, how to develop the basics, for starting to plan, a design for a wind turbine

http://en.wikipedia.org/wiki/Wind_turbine

Answer 2

The link may be helpful. Good luck.