Terms A - F 
 

    An electric current that reverses direction in a circuit at regular intervals.
     
    Any number of photovoltaic modules connected together electrically to provide a single electrical output. An array is a mechanically integrated assembly of modules or panels together with a support structure (including foundation and other components, as required) to form a free-standing field installed unit that produces DC power.
     
    Two or more electrochemical cells enclosed in a container and electrically interconnected in an appropriate series/parallel arrangement to provide the required operating voltage and current levels. Under common usage, the term battery also applies to a single cell if it constitutes the entire electrochemical storage system.
     
    The smallest, basic photovoltaic device that generates electricity when exposed to light.
     
    A one way flow of electric current. Typical sources of direct currents are electric cells, rectified power units and direct current generators. This is the current flow produced by a solar system. To be used for typical 120 volt or 220 volt household appliances, it must be converted to AC (alternating current).
     
    The ratio of power output of a photovoltaic cell to the incident power from the sun or simulated sun sources under specified standard installations conditions.
     
    A negatively charged particle. The movement of electrons in an electrical conductor constitutes an electric current.
     
    The full sun condition is the amount of power density received at the surface of the earth at noon on a clear day - about 100 milliWatt per square centimeters (mW/cm2). Lower levels of sunlight are often expressed as 0.5 sun or 0.1 sun. A figure of 0.5 sun means that the power density of the sunlight is one-half of that of a full sun.
             
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