Abstract: A system for a solar panel roof surface effectively uses a roof support substructure having a series of parallel hollow support beams extending downwardly from a roof peak to a roof edge. These parallel hollow beams not only provide support for solar panels but also allow for drainage in channels provided in the beams. A series of solar panels are secured to hollow support beams and collectively define a closed sloped roof surface. The series of solar panels are positioned on the beams to define elongate segments of abutting panels where each elongate segment is one panel wide and supported between adjacent hollow support beams. The abutting panels include a sealing arrangement between panels to allow flow of water along the length of the elongate segments.