White polyester film for a solar cell, sealing sheet for back surface of solar cell using same, and solar cell module

A white polyester film for a solar cell, wherein the film has whiteness of 50 or more, an average reflectance of 50 to 95% in a range of wavelength of 400 to 800 nm, an acid value of 1 to 50 eq/ton, and a thickness of 30 to 380 μm,

• wherein
• the film has a multilayer structure in which a polyester resin layer is disposed as at least one outermost layer,
• the polyester resin layer comprises
• (i) inorganic fine particles I comprising titanium dioxide mainly composed of a rutile type, having an average particle diameter of 0.2 μm to 0.5 μm, and in an amount of 17 to 19% by mass relative to the polyester resin layer,
• and
• (ii) inorganic fine particles II comprising silica or zeolite, having an average particle diameter of 2.2 μm to 7.0 μm, and in an amount of 0.3 to 2.2% by mass relative to the polyester resin layer,
• the inorganic fine particles I and the inorganic fine particles II are the only inorganic fine particles in the polyester resin layer,
• a difference in average particle diameter between the inorganic fine particles I and inorganic fine particles II is 1.7 μm to 6.4 μm,
• the polyester resin layer has a larger thickness than the average particle diameter of the inorganic fine particles II, and
• a half-value width of protrusion distribution on a surface of the polyester resin layer is 200 to 1000 nm, the protrusion distribution being obtained by plotting the number density of protrusions with respect to protrusion height.