A solar power system including a thermal-storage tank installed in the ridge of the roof of a building, and a plurality of solar collector units covered over the roof and outside wall of the building and connected to the thermal-storage tank, wherein each solar collector unit comprises a transparent cover plate with photovoltaic cells for converting the radiant energy of sunlight into electric power, a rear mounting rail, a front mounting frame for engagement with the rear mounting rail of another solar collector unit, a heat-absorber plate having a collector tube connected to the thermal-storage tank, and a lateral mounting frame for connection to another solar collector unit over its heat-absorber plate by screws.
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