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Glossary

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This wiki contains a glossary of all terms used in the Solar Forecast Arbiter. It will eventually be the single source of truth for definitions. Inventing a YAML format for now. See Variable names for programming conventions.

AC capacity:
- Units: MW
- Definition: maximum AC power generation potential under ideal conditions

AC power:
- Units: MW
- Definition: measurement or forecast of AC generation at an instant or averaged over a period of time

Availability:
- Units: %
- Definition: The percent of the power plant that is able to generate power.

CDF

Curtailment:
- Units: MW
- Definition: The generation limit that is imposed during curtailment periods.

DC capacity:
- Units: MW
- Definition: maximum DC power generation potential under ideal conditions

DC power:
- Units: MW
- Definition: measurement or forecast of DC generation at an instant or averaged over a period of time

- Units: W/m^2
- Units: W/m^2
- Units: W/m^2
PDF
- Units: W/m^2
Relative Humidity:
- Units: %
Surface temperature:
- Units: C
Surface wind speed:
- Units: m/s

Surface tilt:
- Units: degrees
- Definition: tilt from horizontal of a fixed tilt system, degrees (flat = 0 degrees, vertical = 90 degrees)
Surface azimuth:
- Units: degrees
- Definition: azimuth angle of a fixed tilt system, degrees (North = 0 degrees, East = 90 degrees)

Axis tilt:
- Units: degrees
- Definition: tilt from horizontal of the tracker axis (flat = 0 degrees, vertical = 90 degrees)
Axis azimuth:
- Units: degrees
- Definition: azimuth angle of the tracker axis (North = 0 degrees, East = 90 degrees)
Ground coverage ratio:
- Definition: ratio of total width of modules on a tracker to the distance between tracker axes. For example, for trackers each with two modules of 1m width each, and a spacing between tracker axes of 7m, the ground coverage ratio is 0.286(=2/7). system
Backtrack:
- Definition: True/False indicator of if a tracking system uses backtracking
Maximum rotation angle:
- Units: degrees
- Definition: maximum rotation from horizontal of a single axis tracker

Temperature Coefficient:
- Units: 1/C
- Definition: The fractional amount by which DC power generation changes in response to a change in temperature. Typically -0.002 to -0.005 per degree C.

Tracking type:
- Definition: type of tracking system, i.e. fixed, single axis, two axis

- Units: %
- Definition: applied to POA irradiance after reflection losses but before spectral mismatch losses.
- Default: 0
DC loss factor:
- Units: %
- Definition: applied to DC current.
- Default: 0
AC loss factor:
- Units: %
- Definition: applied to inverter power output.
- Default: 0

Name:
- Definition: name for the Site, e.g. Desert Rock
Latitude:
- Units: degrees
- Definition: latitude of the Site in decimal degrees north of the equator, e.g. 36.62373
Longitude:
- Units: degrees
- Definition: longitude of the Site in decimal degrees east of the prime meridian, e.g. -116.01947
Elevation:
- Units: m
- Definition: Elevation of the Site in meters above sea level, e.g. 1007
Timezone:
- Definition: IANA timezone of the Site, e.g. Etc/GMT+8

Network:
- Definition: measurement network name, e.g. SURFRAD
Well-Known Text:
- Definition: describes a geometric area for a Site which may be physically extended, e.g. a polygon over a city for a Site that describes many distributed generation PV systems.