TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: A number of down-holder-wires are arranged in series along the end faces of the framework and are present in a distance from each other, according to the length of the connector in the conveying direction, where the contact units of all the down-holder-wires, arranged in series in the direction of each connector, press the respective connector at the solar cell in a linear manner along its length in the conveying direction, and the contact units of the down-holder-wire lie adjacent to the connector and transversely to the conveying direction, independently of each another across its width. A one end of the respective down-holder-wire is provided with a fastening device fixed at a front face, and other end of the down-holder-wire is connected with a power compensation device along the end face, for adjusting the clamping force of the down-holder-wire. The framework forms a record box for recording the force compensation devices defined by the long sides and other side of face. The force compensation devices are attached at a strip arranged transversely to the longitudinal sides in a plane inclined away from the conveyor belt. The framework is designed to be open on the opposite longitudinal side that is opposite to the conveying direction, and has only one longitudinal side, which faces the conveying direction. The force compensation device comprises: a pressure spring, which is held in at its one end in a tubular tension element, and is fixed at its other end at a mounting element; a hand part provided with a one-handed opening for the down-holder-wire, having a bolt-like shank part with external thread, which is held screwed in an axial direction of the tubular tension element in a nut fixed to the tension element with an internal thread for adjusting the bias of the pressure spring; a tension spring, whose one eyelet is mounted in an opening of an angled arm belonging to a strip attached to the second face, in the direction of conveyor belt, and the other eyelet is mounted in an opening of a tension element adjustably connected with the end of down-holder-wire. The contact unit is formed from a cylindrical body provided with an axial passage for the down-holder-wire, which is pushed on the down-holder-wire, and is adjusted and fixed according to the position of the connector on the solar cell along the down-holder-wire. A bore with internal thread is arranged perpendicular in the cylindrical body for operating, and in which a locking screw is screwed for fixing the contact unit on the down-holder-wire. The contact unit formed as roller bodies with at least one pin formed on an end face, with an axial passage. The pin is thin-walled and is deformed such that it is clamped and fixed by a deformation force applied externally on the down-holder-wire according to the position of the connector. The cylinder body or roller body is variable diameter and length and comprises a material, preferably stainless steel, which is temperature-resistant during soldering. The fastening device comprises a clamping arrangement with a passage for the down-holder-wire, fixed at a surface of the end face opposite to the solar cell, and in which the end of the down-holder-wire is inserted and guided, and in which the down-holder-wire is fixed by a locking screw. The clamping arrangement is designed as a strip fixed to the clamping pieces, which are positioned along the face of the clamping frame. The clamping assembly is integrated directly in the upper side of the front face facing away from the solar cell. The down-holder-wire is made of a material, preferably wired metal strands, steel strands, temperature-resistant plastic fibers or threads, or composite materials, which exhibits elastic properties at high temperatures, preferably at soldering temperatures. The clamping frame is provided columns arranged vertically to the transport direction and a drive for vertical lowering or rising to or from the solar cells. The clamping frame, the column and the drive are guided in a drive synchronized with the drive of the conveyor belt by a linear guide horizontally extending in the conveying direction. The drive is a pneumatic-, hydraulic- or electric drive.