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Solar Glossary
AIC See amperage interrupt capability.
Acceptor" A dopant material, such as boron, which has fewer outer shell electrons than required in an otherwise balanced crystal structure, providing a hole, which can accept a free electron. "
Activated Shelf Life" The period of time, at a specified temperature, that a charged battery can be stored before its capacity falls to an unusable level."
Activation Voltage(s) The voltage(s) at which a charge controller will take action to protect the batteries.
Adjustable Set Point A feature allowing the user to adjust the voltage levels at which a charge controller will become active.
Air mass (sometimes called air mass ratio) Equal to the cosine of the zenith angle-that angle from directly overhead to a line intersecting the sun. The air mass is an indication of the length of the path solar radiation travels through the atmosphere. An air mass of 1.0 means the sun is directly overhead and the radiation travels through one atmosphere (thickness).
Alternating Current (AC)" A type of electrical current, the direction of which is reversed at regular intervals or cycles. In the United States, the standard is 120 reversals or 60 cycles per second. Electricity transmission networks use AC because voltage can be controlled with relative ease. "
Ambient Temperature The temperature of the surrounding area.
Amorphous Semiconductor A non-crystalline semiconductor material that has no long-range order.
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."
Amperage Interrupt Capability (AIC) direct current fuses should be rated with a sufficient AIC to interrupt the highest possible current.
Ampere (amp) A unit of electrical current or rate of flow of electrons. One volt across one ohm of resistance causes a current flow of one ampere.
Ampere Hour Meter An instrument that monitors current with time. The indication is the product of current (in amperes) and time (in hours).
Ampere-Hour (Ah/AH) A measure of the flow of current (in amperes) over one hour; used to measure battery capacity.
Angle of Incidence" The angle that a ray of sun makes with a line perpendicular to the surface. For example, a surface that directly faces the sun has a solar angle of incidence of zero, but if the surface is parallel to the sun (for example, sunrise striking a horizontal rooftop), the angle of incidence is 90¿¿."
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