Glossary of terms used on this site
All
| Term | Definition |
|---|---|
| Alternating Current (AC) |
The flow of electricity that constantly changes direction between positive and negative sides. Almost all power produced by electric utilities in the United States moves in current that shifts direction at a rate of 60 times per second. |
| Ambient Temperature |
The temperature of the surrounding area. |
| Amorphous Silicon |
A thin-film, silicon photovoltaic cell having no crystalline structure. Manufactured by depositing layers of doped silicon on a substrate. See also single-crystal silicon an polycrystalline silicon. |
| Ampere (Amp) |
The unit of measure that indicates how much electricity flows through a conductor. It is like using cubic feet per second to measure the flow of water. For example, a 1,200-watt, 120-volt hair dryer pulls 10 amperes of electric current (amps = watts/volts). |
| Ampere-Hour (Ah/AH) |
A measure of the flow of current (in amperes) over one hour; used to measure battery capacity. |
| Annual Solar Savings |
The annual solar savings of a solar building is the energy savings attributable to a solar feature relative to the energy requirements of a non-solar building. |
| Array |
A number of solar modules connected together in a single structure. |
| Array Current |
The electrical current output of a PV array when exposed to sunlight. |
| Array Operating Voltage |
The voltage output of a PV array when exposed to sunlight and feeding a load. |
| Average Demand |
The energy demand for a given location over a period of time. For example, the number of kilowatt-hours used in a 24-hour period, divided by 24 hours, tells the average demand for that location in that time. |
| Avoided Cost |
The amount of money an electric utility would need to spend for the next increment of electric generation to produce or purchase. |
| Azimuth Angle |
The angle between true south and the point on the horizon directly below the sun. |
| Battery |
Batteries are often sold with a solar electric system. The primary purpose is to store the electricity not immediately used, which could be used at some later time. |
| BIPV (Building-Integrated Photovoltaics) |
A term for the design and integration of photovoltaic (PV) technology into the building envelope, typically replacing conventional building materials. This integration may be in vertical facades, replacing view glass, spandrel glass, or other facade material; into semitransparent skylight systems; into roofing systems, replacing traditional roofing materials; into shading "eyebrows" over windows; or other building envelope systems. |
| Btu (British Thermal Unit) |
The amount of heat required to raise the temperature of one pound of water one degree Fahrenheit; equal to 252 calories. |
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