NOVELTY - A photovoltaic module assembly (10) comprises: photovoltaic modules (18) including back sheet, crystalline silicon photovoltaic cells, first encapsulant layer, and cover sheet; rails (20) fixed relative to back sheet, and formed to support photovoltaic module on racking system of photovoltaic module installation site; and adhesive contacting the back sheet of the module and rail to adhere the rail to the photovoltaic module. The adhesive is formed from a room-temperature vulcanizing silicone composition; and has a thickness from the rail to the back sheet of 2.3-6 mm.    USE - As a photovoltaic module assembly for mounting on a frame of a racking system of a photovoltaic module installation site (claimed).    ADVANTAGE - The attachment of the rails to the photovoltaic modules is typically free of any type of mechanical hardware such as fasteners and clamps that clamp the rail onto the photovoltaic module, i.e. the rails typically are not mechanically fastened to the photovoltaic modules. As such, the material and assembly costs associated with such mechanical hardware or fasteners are eliminated and the handling of the fragile photovoltaic modules by workers associated with assembling mechanical hardware or fasteners is eliminated. In addition, damage to the photovoltaic modules caused by over-tightening of the mechanical hardware is eliminated. Also, the adhesive is a theft deterrent because it is relatively difficult to break the adhesive between the rail and the photovoltaic module without proper tools.    DETAILED DESCRIPTION - A photovoltaic module assembly (10) for mounting on a frame of a racking system of a photovoltaic module installation site, comprises: at least one photovoltaic module (18) including a back sheet, at least one crystalline silicon photovoltaic cell supported on the back sheet, a first encapsulant layer formed from a silicone composition supported on the photovoltaic cell, and a cover sheet supported on the first encapsulant layer; at least one rail (20) fixed relative to the back sheet, and is configured to support the photovoltaic module on the racking system of the photovoltaic module installation site; and adhesive disposed between and contacting the back sheet of the photovoltaic module and rail to adhere the rail to the photovoltaic module. The adhesive is formed from a room-temperature vulcanizing silicone composition; and has a thickness from the rail to the back sheet of 2.3-6 mm. The thickness is measured along a first line extending from the rail to the back sheet of the photovoltaic module, where the adhesive has a width (W) between the rail and the back sheet measured along a second line perpendicular to the first line, where the width is 5-20 mm. The back sheet of the photovoltaic module includes a first end (44) and a second end (46), where the rail continuously extends across the back sheet of the photovoltaic module from the first end to the second end. The room temperature vulcanizing silicone composition is a condensation curable silicone composition comprising an organopolysiloxane having at least one hydrolysable group, a crosslinking agent and a catalyst. An INDEPENDENT CLAIM is included for assembling a photovoltaic module assembly involving: providing at least one photovoltaic module including at least one crystalline silicon photovoltaic cell, a first encapsulant layer formed from a silicone composition disposed on the photovoltaic cell, and a cover sheet disposed on the first encapsulant layer; providing at least one rail; applying a room-temperature vulcanizing silicone composition to one of the back sheet or the rail; contacting the room-temperature vulcanizing silicone composition to the other of the back sheet or the rail; and curing the room-temperature vulcanizing silicone composition while in contact with the back sheet and the rail to adhere the rail to the back sheet, where applying the room temperature vulcanizing silicone composition includes applying the room temperature vulcanizing silicone composition at a thickness such that the room-temperature vulcanizing silicone composition cures into an adhesive adhering the rail to the back sheet and having a thickness from the rail to the back sheet of 2.3-6 mm.    DESCRIPTION OF DRAWING(S) - The figure shows a perspective view of a photovoltaic module assembly.    Photovoltaic module assembly (10)    Photovoltaic module (18)    Rail (20)    First end (44)    Second end (46)    Width (W)