NOVELTY - Forming back-sheet for a photovoltaic module involves: providing a polymer melt comprising ethylene propylene diene terpolymer, inorganic particulates, and adhesive; depositing the polymer melt directly on fluoropolymer film (24) and pressing the fluoropolymer film and polymer melt together and cooling the polymer melt to form a first polymer layer (22) from the polymer melt, where 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.    USE - For forming a back-sheet for a photovoltaic module (claimed).    ADVANTAGE - The peel strength between the fluoropolymer film and the first polymer layer is greater than 2 (preferably greater than 8) Newtons/cm after 1000 hours of exposure at 85 degrees C and 85% relative humidity. The photovoltaic module back-sheet is durable over extended periods of time; can adhere directly to the back surface of solar cells so as to seal and protect the solar cells; offers excellent moisture resistance, good electrical insulation, high transparency, high impact resistance, high penetration resistance, good ultraviolet (UV) light resistance, good long term thermal stability, adequate adhesion strength to front-sheets, back-sheets, other rigid polymeric sheets and solar cell surfaces, and long term weatherability properties; and are economical to produce and use.    DETAILED DESCRIPTION - Forming a back-sheet for a photovoltaic module, involves: providing a fluoropolymer film (24); providing a polymer melt comprising 20-95 wt.% ethylene propylene diene terpolymer, 5-70 wt.% inorganic particulates, and 0-50 wt.% of adhesive selected from thermoplastic polymer adhesives and tackifiers, based on the weight of 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 a first polymer layer from the polymer melt, where the first polymer layer (22) having a thickness of at least 0.1 mm, where 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. INDEPENDENT CLAIMS are included for the following:    (1) forming a photovoltaic module (13), involving: providing the polymer melt; depositing the polymer melt directly on the fluoropolymer film and pressing the fluoropolymer film and polymer melt together to form the first polymer layer from the polymer melt; providing several solar cells (16) 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; and    (2) photovoltaic module comprising: several solar cells having front light receiving side and opposite rear side; a polymer layer (22) having opposite first and second sides, the first side of the polymer layer being adhered directly to the rear side of the solar cells, the polymer layer comprising 20-95 wt.% ethylene propylene diene terpolymer, 5-70 wt.% inorganic particulates, and 0-50 wt.% of adhesive selected from thermoplastic polymer adhesives and tackifiers, based on the weight of the polymer layer; and fluoropolymer film adhered directly to the second side of the polymer layer.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of the photovoltaic module with a disclosed back-sheet.    Photovoltaic module (13)    Front encapsulant layer (14)    Solar cells (16)    Ethylene propylene diene terpolymer containing polymer layer (22)    Fluoropolymer film (24)