Roof panel comprising a photovoltaic module having a top surface, a bottom surface and lateral edges, and at least one rib fixedly connected to the photovoltaic module and transversely, preferably perpendicularly, projecting away from the bottom surface and extending along a lateral edge of the photovoltaic module. The height (h, h1, h2) of the at least one rib increases, preferably continuously increases, in direction along the lateral edge, such that the lower edge of the at least one rib is inclined with respect to the bottom surface and/or the top surface of the photovoltaic module.