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Mariah Power's Windspire Wind Turbine Testing and Results

A video of Mariah Power's Windspire wind turbine. Text Version

As part of the National Renewable Energy Laboratory and U.S. Department of Energy (NREL/DOE) Independent Testing project, NREL tested Mariah Power's Windspire Giromill small wind turbine at the National Wind Technology Center (NWTC) through January 14, 2009 when NREL terminated its testing. Read a chronology of events and letter from Mariah Power to NREL.

The Windspire is a 1.2-kilowatt (kW) vertical-axis small wind turbine. The turbine tower is 9.1 meters tall, and its rotor area is 1.2 by 6.1 meters. The turbine has a permanent-magnet generator with a single-phase output at 120 volts AC.

Testing Summary

Testing was terminated January 14, 2009. Published test reports include information and data through that date.

5/5/2008: 0; 5/31/2008: 32; 6/23/2008: 68; 7/28/2008: 88; 8/22/2008: 98; 9/11/2008: 108; 10/8/2008: 118; 11/12/2008: 138;
Activity Status
Award of Subcontract February 5, 2008
Preparation for Installation Foundation poured: February 21, 2008
Components received: March 7, 2008
Inverter received: May 2, 2008
Documentation received: May 8, 2008
Turbine Installation Turbine Installed: March 17, 2008
Inverter Installed: May 5, 2008
Turbine Commissioning May 15, 2008
Turbine O&M and Testing  
Safety and Function Test Wind Turbine Safety and Function Test Report for the Mariah Windspire Wind Turbine
Power Performance Test Wind Turbine Generator System Power Performance Test Report for the Mariah Windspire 1-kW Wind Turbine
Hrs of valid data (60 required)
Bins completed (3-14 m/s required)
0.5 - 13.5
Acoustic Noise Test Testing terminated 1/14/09
Power Quality Test N/A
Duration Test Wind Turbine Generator System Duration Test Report for the Mariah Windspire Wind Turbine
Months of operation (6 required)
Hours of power production (2,500 required)
Hours of power production in winds greater than 7.2 m/s (250 required)
Hours of power production in winds greater than 10.8 m/s (25 required)
kWh of production, cumulative
Turbine Removed April 1, 2009
Post-test Inspection N/A
Final Documentation Completed
Project Review Meeting Completed