Abstract: [Problem] To provide a solar power system and a solar panel installation method with which, by using a positioning configuration which is not prone to visible vertical misalignment while preserving sunlight lighting efficiency in the positioning of a plurality of solar panels, solar panel installation is easy, and which is suitable to installing a large solar power system on a hill, in wetlands, etc. [Solution] A solar power system comprises a solar panel group (2) in which a plurality of vertically oriented rectangular solar panels (21) are inclined in the same direction, either left or right, at a prescribed angle of inclination (theta), and the lighting faces (22) of each of the solar panels (21) are arrayed in the same plane.

Abstract: A pile foundation, on top of which a structural object is placed, supported at the ground surface by a plurality of batter piles, has a pile foundation body comprising a lower plate disposed on the bottom side, an upper plate disposed on the top side, and a support post for supporting the lower plate and the upper plate, separated by a prescribed gap, to be substantially parallel. A plurality of piling holes, through which each of the batter piles pass through in a downward direction in a substantially radial form, are formed in the lower plate and the upper plate.