Assembly comprising: - a transparent substrate; - a junction box; - at least one array, arranged on the transparent substrate, comprising a plurality of functional films with a first and a last functional film, the first functional film being placed at the nearest place from the junction box, wherein each functional film is composed of an active element and two busbars (105a, 105b) which electrically connect the active element, the two busbars (105a, 105b) oppositely disposed along at least a part of the borders of the active element and wherein the functional films are electrically connected in parallel starting from the first functional film; said functional films being photovoltaic films; - conductive means (106a, 106b, 106c) linking the functional films together in parallel and linking directly the first functional film to the junction box; characterized in that one of the two busbars of the first functional film is connected to two conductive means (106a, 106c) and the other busbar is connected to a third conductive mean, in that the plurality of functional films comprises a further functional film, in that one of the two busbars of the first functional film is directly connected to the junction box via one of the two conductive means and directly connected to the others functional films (110, 111) via the other conductive mean and the other busbar (10 5b) of the first functional film is directly connected to the junction box and to the others functional films (110, 111) via the third conductive mean and in that the functional films are electrically connected in parallel starting from the first functional film. - a transparent substrate; - a junction box; - at least one array, arranged on the transparent substrate, comprising a plurality of functional films with a first and a last functional film, the first functional film being placed at the nearest place from the junction box, wherein each functional film is composed of an active element and two busbars (105a, 105b) which electrically connect the active element, the two busbars (105a, 105b) oppositely disposed along at least a part of the borders of the active element and wherein the functional films are electrically connected in parallel starting from the first functional film; said functional films being photovoltaic films; - conductive means (106a, 106b, 106c) linking the functional films together in parallel and linking directly the first functional film to the junction box; characterized in that one of the two busbars of the first functional film is connected to two conductive means (106a, 106c) and the other busbar is connected to a third conductive mean, in that the plurality of functional films comprises a further functional film, in that one of the two busbars of the first functional film is directly connected to the junction box via one of the two conductive means and directly connected to the others functional films (110, 111) via the other conductive mean and the other busbar (10 5b) of the first functional film is directly connected to the junction box and to the others functional films (110, 111) via the third conductive mean and in that the functional films are electrically connected in parallel starting from the first functional film.