NOVELTY - A photovoltaic array comprises photovoltaic panels each having at least one distinctive feature, and an electrode of a positive electrical polarity and an electrode of a negative electrical polarity. Each panel further comprises a keying feature being disposed in a predetermined relationship with respect to the distinctive feature of the panel.    USE - The photovoltaic array is used in solar array.    ADVANTAGE - The photovoltaic panel has keying features that facilitate the arrangement of such panels into an array where any selected distinctive feature on the panels may be arranged in accordance with a predetermined pattern. The keying features on the panel should facilitate both the mechanical mounting of the panels to a support surface or to a framework in a predetermined pattern as well as the electrical interconnection of the panels in the array in a desired electrical connection pattern. The panel construction includes keying features which minimized the training required for installation personnel to properly install an array and minimizes the possibility of incorrect installation of an array.    DETAILED DESCRIPTION - A photovoltaic array comprises photovoltaic panels each having at least one distinctive feature, and an electrode of a positive electrical polarity and an electrode of a negative electrical polarity. Each panel further comprises a keying feature being disposed in a predetermined relationship with respect to the distinctive feature of the panel. The keying feature on the first panel being cooperatively associable with a complementary keying feature on the second panel such that the distinctive feature on the first panel occupies a predetermined positional relationship with respect to a distinctive feature on the second panel when the panels are operatively arrayed to each other. An INDEPENDENT CLAIM is a method for installing a photovoltaic array by bringing the first and second panels into proximity with each other such that the keying feature on the first panel is cooperatively associated with the complementary keying feature on the second panel; and joining the first and second panels to each other such that the distinctive feature on the first panel occupies a predetermined positional relationship with respect to a distinctive feature on the second panel.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a photovoltaic panel.    Panel (10)    Photovoltaic module (12)    Frame (14)    Connector (20)    Electrode (22)