This turbine is the Energy Ball. It is a Darrieus style wind turbine. It is made by the Swedish company Home Energy. It is a very efficient design. There are currently 2 models, the V100 and the V200. Both feature 6 blades, that work with very low wind speeds. The much improved venturi blade design funnels air through the blades significantly increasing blade speed. Noise levels are very low, usually background noise is louder. For residential use this design is a very good choice.

Specifications -

V100 - 500 watts

• Rotor diameter - 1.1 meters (3.6 ft.)
  
• Rotor weight - 30 kg (66 lbs.)


• Minimum life expectancy 25 years

V200 - 2,500 watts

• Rotor diameter - 1.98 meters (6,5 ft.)
  
• Rotor weight - 90 kg (198 lbs.)
  
• Minimum life expectancy - 15 years

Both models are self starting (yaws into the wind) and have survival wind speeds of 90 mph.