Alternative Energy
Energy produced by alternative means like wind and solar.
Amorphous Silicon
A type of PV cell manufactured without a crystallne structure.; Can be made in flexible sheets.; Not as efficient as crystallalline silicon.

Array
A collection of electricity connected Photovoltaic modules.
Array Current
The electrical current produced by a PV array when exposed to sunlight.
BTU
British Thermal Unit- The quantity of heat required to raise the temperature of one pound of water one degree Fahrenheit.
Base Load
The average amount of electric power that a utility must supply.

Cloud Enhancement
The increase in solar intensity caused by reflected irradiance from nearby clouds.
Crystalline Silicon
A type of PV cell made from a single crystal or polycrystalline slice of silicon.
Design Month
The month having the combination of insolation and load that requires the maximum energy from the array.
Angle of Incidence
Angle at which a ray of light strikes a planar surface (module).

Angle of Inclination
The desired angle that a PV array should be mounted.
Direct Beam Radiation
Radiation received by direct solar rays.
Down Time
Time when the PV system cannot provide for the load.

; Expressed in hour per year or the percentage equivalent.

Efficiency
The ratio of output power to input power, expressed as a percent.Wattage X Efficiency (2500w input X .

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90% output = 2250w)

Fixed Tilt Array
A PV array set at a fixed angle with respect to horizontal.
Insolation
The solar radiation incident on an area over time.; Equivalent to energy and usually expressed in kilowatt hours per square meter.
Irradiance
The solar power incident on a surface.

; Usually expressed in kilowatts per square meter.

Orientation
Placement with respect to the directions, N, S, E, W, in most cases azimuth is the measure of orientation from North but in PV it is measured from Solar South.
Peak Sun Hours (PSH)
The equivalent of number of hours per day when solar irradiance averages on sun (1kw/m2).; 5 Peak Sun Hours X 1000w/m2 = 5kwh/m2.
Pole Mount
A type of array mounting system where module are installed at an elevation on a pedestal.

Pyrheliometer
A sensor that measures direct solar radiation.
Rack Mount
A type of fixed or adjustable tilt array mounting system with a triangular shaped structure to increase the tilt angle of the array.
Tracking Array
A PV array that follows the path of the sun. It can be one or two axis.
Total Solar Radiation
All of the solar radiation reaching earth’s surface.
Zenith Angle
The angle between directly overhead and the line intersecting the sun.; It is the elevation angle of the sun above the horizon.