NOVELTY - The photovoltaic module useful in a power installation, comprises a rigid transparent front layer (12), an electrically conductive foil back layer (20), and solar cells (16) positioned between the front layer and the back layer. The conductive foil is wrapped around to cover an edge of the front layer and/or an edge and a portion of the front surface of the front layer. The rigid transparent front layer comprises a glass plate. The solar cells are arranged to be protected by the front layer and the back layer. The foil is set at a voltage potential of one of the solar cells.    USE - The photovoltaic module is useful in a power installation (claimed).    ADVANTAGE - The photovoltaic module is low cost, reliable and well suited for large scale installation at dedicated sites, where redundant elements can be eliminated, and ensures a high voltage withstand between the cells and the outer surface of the back layer.    DETAILED DESCRIPTION - The photovoltaic module useful in a power installation, comprises a rigid transparent front layer (12), an electrically conductive foil back layer (20), and solar cells (16) positioned between the front layer and the back layer. The conductive foil is wrapped around to cover an edge of the front layer and/or an edge and a portion of the front surface of the front layer. The rigid transparent front layer comprises a glass plate. The solar cells are arranged to be protected by the front layer and the back layer. The foil is set at a voltage potential of one of the solar cells, and provides a moisture barrier to prevent moisture entry between the front layer and the back layer. A butyl rubber adhesive is placed between the front layer and the foil covering the edge of the front layer. INDEPENDENT CLAIMS are included for:    (1) a method; and    (2) a photovoltaic power installation.    DESCRIPTION OF DRAWING(S) - The figure shows an exploded perspective view of a photovoltaic module.    Transparent front layer (12)    First pottant layer (14)    Solar cells (16)    Second pottant layer (18)    Back layer. (20)