There are many definitions for a small wind
turbine. The international standard defines it by the rotor swept area, but the more common definition is by the power rating (kW).
Countries usually have their own classification. For example, in Estonia it is up to 200 kW, while in Denmark it can be considered up to 25 kW and up to 60 kW in Italy. These definitions are not strictly technical, but are defined according to the access to financial green energy support schemes. For example in Denmark, the 60 kW wind generator, while technically belonging to the small wind class, will not receive small wind support.
You can find the information about Your country using one of the useful links on this page.
Continue to find out more about common characteristics of small wind generators.