Glossary of Solar Terms

Alternating Current (AC)

An alternating current (AC) is an electrical current whose magnitude and direction vary cyclically, as opposed to direct current, whose direction remains constant. Used generically, AC refers to the form in which electricity is delivered to businesses and residences.

Array

see photovoltaic (PV) array

Array Operating Voltage

The voltage produced by a photovoltaic array when exposed to sunlight and connected to a load (the demand on an energy producing system).

Availability

The quality or condition of a photovoltaic system being available to provide power to a load. Usually measured in hours per year.