NOVELTY - The panel (1) has a photovoltaic module (2) including a photovoltaic cell placed on a face of the panel facing towards an exterior of a refrigerated box. An insulating layer (4) is placed on a face of the panel facing towards an interior of the box. Air flow units (3) are interposed between the photovoltaic module and the insulating layer. Lateral fixing frames hold the photovoltaic module in a position on a wall of the box. A converter and storage batteries are connected to the module, where the module includes parts made of a transparent polymer material.    USE - Panel for forming a part of a wall delimiting a refrigerated chamber in a refrigerated box of a vehicle (all claimed) i.e. lorry, that is utilized for transporting goods.    ADVANTAGE - The configuration of the photovoltaic module, the insulating layer and the air flow units permits utilization of the electrical energy generated by the photovoltaic module directly to cool inside of the box while benefiting from the movement of the air relative to the movement of the lorry in order to cool the photovoltaic module and form an insulating thermal gradient between the photovoltaic module and the insulating panel to remain at low temperature when the module and the panel are subjected directly to solar irradiation. The configuration and arrangement of the air flow units improve the ventilation performance of the panel. The arrangement of the insulating layer permits the panel to adapt to the original existing walls to reduce the weight and cost of the panel and to design the panels in order to benefit fully from all the surface area available on the wall of the box. The parts of the photovoltaic module are made of the transparent polymer material, thus lightening the photovoltaic module in order to reduce the fuel consumption of the lorry.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a vehicle comprising a refrigerated box.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross sectional view of a panel.    Panel (1)    Photovoltaic module (2)    Air flow units (3)    Insulating layer (4)    Surface (5a)