Floating photovoltaic installation comprising photovoltaic panels and a system for supporting photovoltaic panels resulting from the assembly of devices for supporting photovoltaic panels and of connecting elements, the supporting devices and the connecting elements being modular elements, said system having means for fastening, for assembly together, said connecting elements and said devices for supporting photovoltaic panels and wherein: - each device for supporting a photovoltaic panel is comprised substantially of a sealed plastic jacket, said plastic jacket constituting a lower wall, an upper wall, and four sidewalls (5, 6, 7, 8), said plastic jacket being able to enclose a volume of air allowing it to constitute a floater, with the device having means for maintaining a photovoltaic panel on said upper wall of said plastic jacket - each connecting element is comprised substantially by a sealed plastic jacket, said plastic jacket of said connecting element constituting a lower wall, an upper wall, and four sidewalls (34, 35, 36, 37), said plastic jacket having an interior volume allowing the floating of said connecting element to be ensured and wherein said photovoltaic panels are maintained on the upper walls of the plastic jackets of the devices for supporting photovoltaic panels said system having at least two rows (R1, R2) of devices for supporting photovoltaic panels, said two rows (R1, R2) of devices being maintained by means of a spacer row of connecting elements, able to constitute a maintenance corridor, said spacer row of connecting elements being a spacer row that is configured so as to separate the two rows (R1, R2) of devices for supporting photovoltaic panels from one another, preventing a photovoltaic panel belonging to a row of supporting devices from casting a shadow on a photovoltaic panel of a successive row of supporting devices and wherein two consecutive supporting devices belonging to the same row of supporting devices are separated mutually by means of a connecting element, or even two connecting elements in parallel, spacing the two devices, and such that the separation between the two consecutive devices belonging to the same row allows the photovoltaic panels to be arranged such that they overhang the plastic jackets of the supporting devices, said row being constituted by said supporting devices, arranged side by side by the intermediary of their sidewalls (5, 7), said photovoltaic panels being provided such that they overhang the plastic jackets of the supporting devices. - each device for supporting a photovoltaic panel is comprised substantially of a sealed plastic jacket, said plastic jacket constituting a lower wall, an upper wall, and four sidewalls (5, 6, 7, 8), said plastic jacket being able to enclose a volume of air allowing it to constitute a floater, with the device having means for maintaining a photovoltaic panel on said upper wall of said plastic jacket - each connecting element is comprised substantially by a sealed plastic jacket, said plastic jacket of said connecting element constituting a lower wall, an upper wall, and four sidewalls (34, 35, 36, 37), said plastic jacket having an interior volume allowing the floating of said connecting element to be ensured