• Solar PV
    Solar Photovoltaic (PV) Systems convert sunlight into electricity. You can use this electricity to power your home, business or any other building.
    Learn More
  • Solar
    Hot Water
    Solar Thermal Water Heating Systems use the sun's energy to heat water for use by homes, commercial buildings and swimming pools.
    Learn More
  • Solar Space
    Solar Thermal Space Heating Systems capture the sun's energy to supplement the existing heating system for a home or commercial building.
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  • Small Wind
    Small Wind Energy Systems contain electric generators that convert wind power into clean, emissions-free power.
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  • Geothermal
    Geothermal heat pumps use the earth's energy to provide heating, cooling and hot water for residential and commercial buildings.
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  • Biomass
    & Bio Fuel
    Biomass Heating Systems generate heat from organic materials and residues. The systems are used for space heating and to heat water.
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  • Combined
    Heat & Power
    Micro Combined Heat and Power Systems are highly efficient natural gas systems that produce electricity and heat at the same time.
    Learn More

Small Wind

Small Wind Energy Systems (Wind Turbines) contain electric generators that convert the power of the wind into clean, emissions-free power for individual homes, farms, and businesses. In most areas of the country small turbines may be suitable for owners with as little as one acre of land , and some designs may even be suitable for roof-mounting in certain urban environments.

System Components

Small wind turbines can be mounted on a tower to capture the most energy, or be roof mounted. At 80-100 feet (25-30 meters) or more above ground, wind turbines can take advantage of the faster and less turbulent wind. Turbines catch the wind's energy with their propeller-like blades. Usually, two or three blades are mounted on a shaft to form a rotor.

The blades act much like an airplane wing. When the wind blows, a pocket of low-pressure air forms on the downwind side of the blade. The low-pressure air pocket then pulls the blade toward it, causing the rotor to turn. This is called lift. The force of the lift is actually much stronger than the wind's force against the front side of the blade, which is called drag. The combination of lift and drag causes the rotor to spin like a propeller, and the turning shaft spins a generator to make

Source: Department of Energy

Product Options
Decision Criteria
Component : Wind Turbine
  • The turbine consists of 2-3 blades and the hub they are attached to
  • Wind blowing over the blades turns them
  • The blades are turned out of the wind if the wind is blowing too hard or too softly; a brake stops them in an emergency
  • Blades are typically made of wood, PVC, aluminum, or fiberglass
  • Horizontal-axis wind turbines (HAWT)
  • Vertical-axis wind turbines (VAWT)
Horizontal-axis wind turbines (HAWT) :
  • Most common type to turbines
  • Have been mass produced for over 30 years
  • Generally 3 blades on the turbine
  • More efficient operation
Vertical-axis wind turbines (VAWT) :
  • Developed within the past five years.
  • Several unique designs and blade configurations.
  • Blade configurations are either Savonius (drag-type) or Darrieus (lift-type), or a combination of the two
Benefits of VAWTs :
  • Omnidirectional - Turnine does not need to change orientation to match the wind direction like HAWTs.
  • More durable and lower operating cost as it has fewer moving parts. Most are direct drive, i.e., no gearbox between the rotor and the generator)
  • More suitable for rooftop & urban installations. More efficient in turbulence
  • Quieter operation & less vibration
  • Compact design
  • Can be installed at lower elevations
  • Offer better aesthetics
Drawbacks of VAWTs:
  • Less efficient power production
  • May have trouble self starting at low wind speeds
Component : Inverter
  • Inverters convert DC electricity into AC (alternative current)
  • Centralized Inverters
  • Inverters have a 10-year warranty
Component : Mounting system
  • Used to mount the solar panels on to the roof or the ground
  • Roof-top
  • Pole mount
  • Recommended height of at least 26 ft, but ideally 20 ft above the highest object within 500 ft
  • In order to reduce vibrations and noise, and to ensure safety, it is important that wind turbines be installed well:
  • Turbine must be electrically grounded for safety from lightning bolts
Component : Monitoring device and service
  • Used by system owners to measure and track system performance
  • Can access system production data over the web
  • On-site monitoring
  • Remote monitoring
  • Additional cost to add a monitoring device and service
  • Ensures the system is performing optimally
  • Helps to quickly identify and correct performance issues
  • Tracking your performance, especially during the warranty period, ensures that you are optimizing your investment.
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