Thermally mounting electronics to a photovoltaic panel

1. An electronics assembly for a photovoltaic panel comprising:

a substrate of a thermally conductive material, wherein the substrate defines a thermal contact area for thermally contacting the electronics assembly to a photovoltaic panel; wherein the substrate is distinct from the photovoltaic panel;

at least one electronic component comprising at least one of a transformer, a capacitor, and a bypass diode 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, via the substrate, the thermal contact provides a heat conductive channel between the at least one electronic component and the photovoltaic panel through the substrate, wherein the heat conductive channel enables the electronics assembly use the photovoltaic panel as a heat sink for heat produced by the at least one electronic component; and

a cover located over the at least one electronic component and covering an area of the substrate;

wherein the area covered by the cover is substantially smaller than the thermal contact area.

2. The electronics assembly according to claim 1 , wherein the area covered by the cover is less than about 50% of the contact area.

3. The electronics assembly according to claim 1 , wherein the area covered by the cover is less than about 30% of the contact area.

4. The electronics assembly according to claim 1 , wherein the cover comprises a substantially flat surface running in parallel to the contact area.

5. The electronics assembly according to claim 1 , wherein the material of the cover is made of a material selected from plastic and metal.

6. The electronics assembly according to claim 5 , wherein the metal is selected from steel, aluminium and stainless steel.

7. The electronics assembly according to claim 1 , wherein the thermal conductivity of the substrate is between 10 and 600 W/(m K).

8. The electronics assembly according to claim 1 , wherein the substrate comprises at least one layer of metal.

9. The electronics assembly according to claim 8 , wherein the metal is selected from steel, stainless steel, aluminium, aluminium alloys and copper.

10. The electronics assembly according to claim 1 , wherein at least one of the at least one electronic component comprises at least one of a bypass diode, a dc-dc converter, an inverter, a battery charge controller and an active bypass diode.

11. The electronics assembly according to claims 1 , wherein the assembly further comprises at least one intermediate heat sink in thermal contact with the at least one electronic component and the substrate, wherein the heat dissipated by the at least one electronic component is conducted via the intermediate heat sink to the substrate.

12. The electronics assembly according to claim 11 , wherein the at least one electronic component is mounted on a printed circuit board and the printed circuit board is thermally connected to the intermediate heat sink using a phase change material.

13. The electronics assembly according to claim 1 , wherein at least one of the substrate and the cover comprises at least one cooling structure.

14. The electronics assembly according to claim 1 , wherein the at least one electronic component is thermally connected to the substrate using a thermally conductive adhesive.