at least one photovoltaic element;

at least one frame surrounding a periphery of a respective one of the at least one photovoltaic element, the at least one frame having a first side and a second side, a plurality of projections being defined on the first side and a plurality of recesses being defined on the second side, the plurality of projections and the plurality of recesses surrounding the periphery of the at least one photovoltaic element and being located in a region of side edges of the photovoltaic element spaced from corner regions of the at least one frame,

wherein each of the plurality of projections of a first one of the at least one frame is configured to engage a respective one of the plurality of recesses of a second one of the at least one frame when the first frame is arranged on the second frame, each of the plurality of projections and each of the plurality of recesses being configured such that each of the plurality of projections is held in a respective one of the plurality of recesses in a form-fitting manner,

wherein each frame of the at least one frame consists of a plurality of frame elements which are connected to one another by at least one connector, the frame elements comprising hollow chamber profiles, and

wherein a highest point of each of the plurality of frame elements is defined by one or more of the plurality of projections.