NOVELTY - Forming (M1) a back-sheet for a photovoltaic module, comprises: (a) providing a fluoropolymer film (24); (b) providing a polymer melt (30) comprising 10-85 wt.% of olefin-based elastomer, 5-75 wt.% of inorganic particulates, and 5-80 wt.% of adhesive including thermoplastic polymer adhesives and tackifiers, based on weight of polymer melt; (c) depositing the polymer melt directly on the fluoropolymer film and pressing the fluoropolymer film and polymer melt together and cooling the polymer melt to form a first polymer layer from the polymer melt.    USE - The method is useful for forming a back-sheet which is useful for forming photovoltaic module (all claimed).    ADVANTAGE - The method: provides photovoltaic module back-sheet that is durable over extended periods of time, that can adhere directly to the back surface of solar cells so as to seal and protect the solar cells and offers excellent moisture resistance and good electrical insulation properties, thus providing photovoltaic module back-sheets and modules that are economical; and utilizes inorganic particulates that increases light refractivity of the back-sheet which serves to increase solar module efficiency and increase the UV resistance of the back-sheet as well as serves to reduce the overall cost of the olefin-based elastomer containing layer.    DETAILED DESCRIPTION - Forming (M1) a back-sheet for a photovoltaic module, comprises: (a) providing a fluoropolymer film (24); (b) providing a polymer melt (30) comprising 10-85 wt.% of olefin-based elastomer, 5-75 wt.% of inorganic particulates, and 5-80 wt.% of adhesive including thermoplastic polymer adhesives and tackifiers, based on weight of polymer melt, where the olefin-based elastomer is a copolymer comprising of at least 50 wt.% of monomer units including ethylene and propylene monomer units copolymerized with at least one different 2-20C alpha olefin monomer units, and the olefin-based elastomer has a melt index of less than 25 g/10 minutes measured according to ASTM D1238; (c) depositing the polymer melt directly on the fluoropolymer film and pressing the fluoropolymer film and polymer melt together and cooling the polymer melt to form a first polymer layer from the polymer melt, where the first polymer layer has a thickness of at least 0.1 mm, and the peel strength between the fluoropolymer film and the first polymer layer is greater than 2 Newtons/cm after 1000 hours of exposure at 85 degrees C and 85% relative humidity, where peel strength is measured according to ASTM D3167 INDEPENDENT CLAIMS are also included for:    (1) forming (M2) a photovoltaic module, comprising: providing the fluoropolymer film; providing the polymer melt; depositing the polymer melt directly on the fluoropolymer film and pressing the fluoropolymer film and polymer melt together and cooling the polymer melt to form the first polymer layer, where the first polymer layer has a first side adhered directly to the fluoropolymer film and an opposite second side; providing many solar cells each having a front sunlight receiving side and an opposite rear side; and pressing the second side of the first polymer layer directly against the rear side of the solar cells and heating the first polymer layer to adhere the second side of the first polymer layer to the rear side of the solar cells;    (2) an integrated back-sheet for a photovoltaic module, comprising: the fluoropolymer film having opposite first and second sides; and the polymer layer adhered directly to the first side of the fluoropolymer film; and    (3) a photovoltaic module comprising: many solar cells having a front light receiving side and an opposite rear side; the polymer layer having opposite first and second sides, where the first side of the polymer layer is adhered directly to the rear side of the solar cells; and the fluoropolymer film adhered directly to the second side of the polymer layer, where the fluoropolymer film forms an exposed surface of the photovoltaic module.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a process for producing a back-sheet.    Roll (12)    Fluoropolymer film (24)    Extruder die (25)    Extruder (29)    Melt layer (30)