NOVELTY - The assembly method involves providing a sub-assembly that includes first layer with first fusible foil and second layer (20) with PV cells (11). The sub-assembly is pre-heated at discrete locations such that first and second layers are fixated at the discrete locations. A third layer with interconnect coil is provided. A fourth layer with second fusible foil is arranged opposite front side of second layer. A fifth layer with transparent or translucent cover panel is arranged opposite fourth layer. The five layers are stacked and heated to fuse them together and provide an assembled PV module.    USE - PV module assembly method for converting optical energy, such as solar radiation, into electrical energy.    ADVANTAGE - Provides an improved method for high precision assembly of a PV module that includes PV cells arranged and fixed in four layers in a sub-assembly and second fusible foil for preventing displacement of PV cells, while maintaining easy air removal between the layers of the sub-assembly when laminating. Ensures improved physical sturdiness of the sub-assembly due to the four-layer arrangement of the PV cells. Uses a pre-heating module that can be arranged at a position in the assembly station at which the layers of the PV module are stacked, to provide the advantage of not having to transport the sub-assembly to, loading in, and removing the sub-assembly from a separate heating station, thus minimizing any risks connected to the handling and the transporting of a non-fixation sub-assembly.    DETAILED DESCRIPTION - The PV cells has a light receiving front side and a back side having electrical contacts positioned opposite the first fusible foil. The interconnect foil has a pattern of electrically conductive tracks comprising of connectors positioned opposite the first layer. The connectors are in an aligned relationship with the electrical contacts. INDEPENDENT CLAIMS are also included for the following:    (1) a sub-assembly used in assembling the PV module;    (2) a PV module assembly system; and    (3) the assembled PV module.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic top view of the pre-heating module for pre-heating of a sub-assembly.    PV cells (11)    Second layer (20)    Halogen lamps (61)    Discrete spot or patch formed locations (62)