Windspire® wind turbines generate power when wind blows against the vertical airfoils causing them to spin. This power is then converted to AC electricity and is immediately available to provide energy to your building. While the technology behind the Windspire is complex, the basic premise is simple: the stronger the wind the more power they will generate. In 17.7 km/h (11mph) annual average winds, each Windspire will generate approximately 2,000 kWhs a year.
Windspires are eligible for rebates up to 50% off the total cost of the installation including the cost of the turbines.
Wind and Site Requirements
The Windspire® wind turbine was designed to operate in areas with average wind speeds of at least 4.5 m/s (10 mph), although they work best where average winds exceed 5.4 m/s (12mph). Winds vary by location, even within a property, and generally preferred sites have access to clear wind. Your Supergreen Solutions can discuss siting guidelines with you in more detail.
What is the difference between Energy and Power?
At wind speeds greater than 3.5 m/s, the Windspire® will begin producing power, which is measured in Watts (W) or kilowatts (kW). Power output jumps up and down as quickly as the wind changes speed, so the industry measures energy in kilowatt-hours (kWh), which is how many watts of power are consumed over a full hour. Your electric company charges you for energy usage based on a rate/kWh. Over the course of a year, each 1.2kW Windspire will produce approximately 2000 kWh in 5 m/s average winds to help offset the energy you require from the electric company. Elevation will affect energy production.
How does it work?
Windspires operate with three sets of tall, narrow airfoils that catch the wind while spinning around a vertical axis. As the rotor turns, a generator conditions the energy into electricity. The grid-tie inverter then converts the electricity from a direct current (DC) to an alternating current (AC) that can be used for buildings and homes.
Are There Specific Requirements for Potential Customers?
A Windspire site requires access to unobstructed wind and adequate space for installation. The Windspire also needs at least class two winds – ideally class three (an average of 5 m/s) – and a tie to the power grid.
Is the Windspire a Grid-Tie or Off-Grid Product?
The currently available Windspire is grid-tie, which requires the unit to be tied into the local utility grid.
Can I sell electricity back to the grid?
Some utilities offer net metering agreements that allow credit for excess power sent back to the grid.
Is the Windspire Independently Tested and Certified?
The Windspire is independently tested at Windward Engineering in Spanish Forks, Utah. This testing allows customers to know what level of power production to expect from specific wind ranges.
Is it Safe for Birds?
The Windspire rotates at a lower speed than most wind turbines and is more visible to flying birds. So far, we have had no reports of collisions – and we have had one report of a nest built under an active unit.
How Does the Braking System Work?
The Windspire is designed to operate in wind speeds of 3-11 m/s. At wind speeds higher than 11 m/s the redundant electronic braking system will engage as a safety feature. While it may seem counterintuitive to engage brakes and therefore cease energy production during high winds, this is essential to the safety and reliability of the Windspire. Per grid specifications, the Windspire will also engage the brake if the grid voltage or grid frequency falls outside the regulatory ranges.