Small wind systems

Wind turbines convert the raw energy of the wind into a useful form, chiefly electricity. Wind power produces about 1.5% of worldwide electricity use, and is growing rapidly, having doubled in the three years between 2005 and 2008. As of May 2009, eighty countries use wind power on a commercial basis.

Small wind turbines – under 100 kilowatts –  represent a growing market, and the US controls about half of world market share.  These turbines may be as small as a fifty watt generator for boat or caravan use. Small units often have direct drive generators, direct current output, aeroelastic blades, lifetime bearings and use a vane to point into the wind.  Turbines should be mounted well above any nearby obstacles. Small wind turbines can be installed on a roof, but rarely generate significant electricity in these settings.  

Working with small wind systems begins with feasibility assessment for a given location – in light of roof strength vibration, and the turbulence caused by the roof ledge.  

Small wind system installers are certified by the North American Board of Certified Energy Practitioners (NABCEP).  NABCEP calls for skills in:

• Site assessment
• Working safely with small wind systems
• Selecting a system design
• Adapting the electrical design for the site
• Adapting the mechanical design for the site
• Installing subsystems and components at the site
• System checkout
• Maintenance and troubleshooting