Mariah Power
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 was testing 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 (PDF 817 KB) Download Adobe Reader.
The Windspire is a 1.2-kW vertical-axis small wind turbine. The turbine tower is 9.1 meters tall, and its rotor area is 1.2 x 6.1 meters. The turbine has a permanent-magnet generator with a single-phase output at 120 volts AC.
Testing Progress
The date of the information in this progress report is January 30, 2009. Supporting data and explanations for data provided in this table will be provided in the final reports. Data presented are preliminary and subject to revision.
Cumulative Energy Production
| 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 | Testing terminated 1/14/09 |
| Power Performance | Testing terminated 1/14/09 |
Hrs of valid data (60 required) |
299 |
Bins completed (3-14 m/s required) |
0.5 - 13.5 |
| Acoustic Noise | Testing terminated 1/14/09 |
| Power Quality | N/A |
| Duration Test | Testing terminated 10/14/08 |
Months of operation (6 required) |
4.8 |
Hours of power production (2,500 required) |
831.3 |
Hours of power production in winds above 7.2 m/s (250 required) |
132.9 |
Hours of power production in winds above 10.8 m/s (25 required) |
12.5 |
KWH of production, cumulative |
108 |
| Post-test Inspection | Not started |
| Final Documentation | Not started |
| Project Review Meeting | Not started |
