NOVELTY - The system has a flat module (2) provided with an upper face (3) and a lower face (4), where the lower face is partially supported by a rafter (1). A photovoltaic panel (12) i.e. rolled type photovoltaic panel, is placed parallel to the flat module, and is provided with an inner face (14) that is turned against the upper face. A shaped section (15) is supported on the upper face of the flat module, and partially supports the inner face of the photovoltaic panel. An attachment unit (5) is fixed to the rafter and the shaped section to integrate the shaped section with the rafter.    USE - System for a roof of a veranda.    ADVANTAGE - The system is configured such that the same glazing bead is extended on multiple photovoltaic panels, so that the speed of installation, robustness, sealing and aesthetic appearance of the roof are improved. The system is configured such that the maintaining units appreciably extend over the entire length of the shaped section so as to assure better distribution of the maintenance effort. The glazing bead is integrated with the rafter via a screw, a clamp and the shaped section once the assembly is fixed on the rafter, thus allowing firm maintenance of the photovoltaic panel, and hence simplifying the structure of the system. The photovoltaic panel is enclosed between the glazing bead and the shaped section, and the flat module is enclosed between the shaped section and the rafter, thus allowing firm maintenance of the different roof elements, simplifying assembly process, and enhancing assembly speed. The assembly of photovoltaic cells does not comprise a support frame so that the thickness of the roof is reduced. The glazing bead ensures better continuity between different juxtaposed photovoltaic panels, thus improving sealing and mechanical resistance of the system, and assuring harmonious aesthetic aspect. The closed contour directly carries the maintenance units, and the maintenance units are thus not located remotely from the shaped section and are not positioned in an overhang manner with respect to the closed contour, so that the robustness of the system is reinforced. The system has low fabrication cost, and facilitates the management of stocks of the elements. The system improves efficiency of the photovoltaic panels, and reinforces the heat and phonic insulation of the roof.    DESCRIPTION OF DRAWING(S) - The drawing shows a transverse sectional view of a system for a roof of a veranda.    Rafter (1)    Flat module (2)    Upper face (3)    Lower face (4)    Attachment unit (5)    Photovoltaic panel (12)    Inner face (14)    Shaped section (15)