NOVELTY - Electronics assembly (100) comprises: a substrate (102) of a thermally conductive material, where the substrate defines a thermal contact area for thermally contacting the electronics assembly to a photovoltaic panel (106); and at least one electronic component provided on the substrate and in thermal contact with the substrate.    USE - The electronic assembly is useful in photovoltaic panel and solar panel system (all claimed).    ADVANTAGE - The electronic assembly utilizes the thermally conductive substrate that eliminates the need for expensive cooling structures such as cooling fins and provides effective cooling of electronics even if no or little ventilation is present at the back of the panel, thus the assembly is cost-effective, simple and provides well-defined and predictable system which is stable over a long period of time.    DETAILED DESCRIPTION - Electronics assembly comprises: a substrate of a thermally conductive material, where the substrate defines a thermal contact area for thermally contacting the electronics assembly to a photovoltaic panel; and at least one electronic component provided on the substrate and in thermal contact with the substrate, so that when the electronics assembly is in thermal contact with the photovoltaic panel, the thermal contact provides a heat conductive channel between the electronic components and the photovoltaic panel, and the heat conductive channel enables the electronics assembly to use the photovoltaic panel as a heat sink for heat produced by the electronic compounds. An INDEPENDENT CLAIM is also included for a solar panel system comprising: at least one photovoltaic laminate comprising at least one photovoltaic cell; and at least one electronic assembly for receiving an electrical signal from the photovoltaic cell in the laminate.    DESCRIPTION OF DRAWING(S) - The figure shows schematic representation of the electronic assembly.    Electronic assembly (100)    Substrate (102)    Cover (104)    Photovoltaic panel (106)    Wiring (108)