A photovoltaic module backsheet includes a polyester film having opposite first and second surfaces, and first and second fluoropolymer coatings on the first and second surfaces of the polyester film. The first and second fluoropolymer coatings each include fluoropolymer selected from homopolymers and copolymers of vinyl fluoride and homopolymers and copolymers of vinylidene fluoride polymer blended with compatible adhesive polymer. The compatible adhesive polymer includes a backbone that is compatible with the fluoropolymer and pendant functional groups. The pendant functional groups are selected from carboxylic acid, sulfonic acid, aziridine, anhydride, amine, isocyanate, melamine, epoxy, hydroxy and mixtures thereof. The surfaces of the polyester film include functional groups on each surface that interact with the pendant functional groups of the compatible adhesive polymer in the first and second fluoropolymer coatings to promote bonding of the first and second fluoropolymer coatings to the respective surfaces of the polyester film.