NOVELTY - The photovoltaic module (1) comprises a first backsheet (B1), which is flat and flexible with respect to its lying plane, photovoltaic cells (C), which are made of crystalline silicon and arranged on an upper face of the first backsheet either directly or with the interposition of a first sheet of ethylene vinyl acetate, transparent plastic films (2), which are arranged on the cells either directly or with the interposition of a second sheet of ethylene vinyl acetate to isolate them from the outside, and a second backsheet, which is flexible with respect to its lying plane.    USE - The crystalline silicon photovoltaic module is useful in a photovoltaic panel (claimed) for a building and as a covering.    ADVANTAGE - The photovoltaic module can be economically manufactured with high flexibility and lightweight and easily mounted in roofs of industrial buildings, is easy to connect to the alternating current mains, prevents the panel from overheating, and is free from completely stiff plates or stiff layers such as glass plates, which do not bend.    DETAILED DESCRIPTION - The photovoltaic module (1) comprises a first backsheet (B1), which is flat and flexible with respect to its lying plane, photovoltaic cells (C), which are made of crystalline silicon and arranged on an upper face of the first backsheet either directly or with the interposition of a first sheet of ethylene vinyl acetate, transparent plastic films (2), which are arranged on the cells either directly or with the interposition of a second sheet of ethylene vinyl acetate to isolate them from the outside, a second backsheet, which is flexible with respect to its lying plane and is positioned on the first backsheet and on the opposite side with respect to the cells, a third sheet of ethylene vinyl acetate interposed between the first and second backsheets, and reinforcing ribs extending at edges of the module or a reinforcing frame extending next to part of a perimeter of the module to prevent the module itself to be twisted and bent beyond a desired threshold. The first backsheet, the photovoltaic cells, the transparent plastic film and, if present, the sheets of ethylene vinyl acetate are hot-rolled together to form a sandwich, which is flexible with respect to its lying plane and able to take a convex or concave configuration. The second backsheet and the third sheet of ethylene vinyl acetate are hot-rolled together with other members composing the sandwich structure of the module. The second backsheet is a metal plate having a thickness of 0.5-5 mm so to be flexible and prevent the photovoltaic cells from being deformed until breaking. The transparent plastic films have a thickness of 15-100 mu m. The photovoltaic cells are electrically connected by wires or strip conductors interposed either between the photovoltaic cells and the transparent films or between the photovoltaic cells and the second sheet of ethylene vinyl acetate. The reinforcing ribs and the reinforcing frame are made of metal profiles, and are provided with heat sinks. The photovoltaic module is integrated in a covering member such as a second metal sheet for buildings. INDEPENDENT CLAIMS are included for:    (1) a photovoltaic panel; and    (2) a method of manufacturing a photovoltaic module.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a photovoltaic module.    Photovoltaic module (1)    Transparent plastic film (2)    First backsheet (B1)    Photovoltaic cells (C)    Ribbons. (R)