Described is a flexible composite strip comprising a flexible printed circuit (2) comprising at least a first and a second conductor track (5, 6), a plurality of groups (4) of photovoltaic cells (3) being connected in parallel to said first and second tracks (5, 6) for supplying them; the composite strip comprises a plurality of soldering pads (12) at which the first and second conductor tracks (5, 6) are accessible; the flexible composite strip is configured to be cut at the soldering pads (12).