Roof tile systems for structures are provided. A representative system (100) includes a solar panel tile (102) having a top side (121) for facing away from a structure, a bottom side (122) for facing lower side (126) for facing the downslope direction, the solar panel (150), the solar panel tile (102) having a first rib (131, 132, 133, 134) extending across the cavity (128); and a solar panel (150) mounted within the cavity (128) and supported by the first rib (131, 132, 133, 134) such that the solar panel tile (102) being a first of multiple solar panel tiles (102), with the multiple tiles being operative to engage in a side-by- side arrangement to form at least a partial course of tiles of the system (100).