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10.0 System Monitoring
NOTICE: Use of the material contained in this document is subject to the warning on page Iv and the disclaimer
on page v of this document.
DOC012R02 AOC 15/50 User Manual Nov 2001
87
production depends on a site's actual wind resources and conditions, and varies with wind
turbine condition, altitude, temperature, topography and the proximity of other structures. It
should be noted that most sites experience seasonal variations in wind resources and, therefore,
in energy production.
10.5 Wind Energy Data Sheet
The wind energy data sheet (see Appendix G) can assist evaluating AOC wind systems. It can
be used whenever both a dedicated non-ratcheted kWh meter and a recording anemometer have
been installed.
NOTE: AOC bases all published output projections on monthly averages. Data should be
sampled at small, regular intervals throughout the month, preferably at the same time each day,
e.g. every 48 hours at 8:00 a.m. For best results, sample intervals should not exceed four days;
daily sampling provides greater accuracy. For comparison with monthly data projections,
readings should be taken on the same day each month. Energy output varies with air density
and tends to be lower at high temperatures and high altitudes than at low temperatures and low
altitudes. Monthly projections are based on 15ºC (59ºF) at sea level using a Rayleigh
distribution. If the average wind speed is made up of a combination of strong and weak winds,
the energy output will typically be greater than if the average is composed entirely of moderate
winds. This is due to the relationship of wind speed to energy production.