Electrically isolated heat dissipating junction box
A junction box used for making electrical connections to a photovoltaic panel. The junction box has two chambers including a first chamber and a second chamber and a wall common to and separating both chambers. The wall may be adapted to have an electrical connection therethrough. The two lids are adapted to seal respectively the two chambers. The two lids are on opposite sides of the junction box relative to the photovoltaic panel. The two lids may be attachable using different sealing processes to a different level of hermeticity. The first chamber may be adapted to receive a circuit board for electrical power conversion. The junction box may include supports for mounting a printed circuit board in the first chamber. The second chamber is configured for electrical connection to the photovoltaic panel. A metal heat sink may be bonded inside the first chamber.
1. A junction box comprising:
a wall common to and physically separating a first chamber and a second chamber, the first chamber comprising a heat sink attached therein, and the second chamber comprising an electrical connector providing an electrical connection to a photovoltaic panel; and
a circuit board for electrical power conversion disposed in the first chamber, wherein the heat sink is adapted to dissipate heat generated by the circuit board, the circuit board electrically connected, through the wall, to the electrical connection in the second chamber.
2. The junction box of claim 1 , further comprising a bus bar sealed therein.
3. The junction box of claim 2 , wherein the bus bar provides electrical connectivity between the circuit board and the electrical connector.
4. The junction box of claim 1 , wherein the wall comprises a double wall adapted to allow for mutual separation of the first chamber to the second chamber.
5. The junction box of claim 1 , wherein the wall comprises a double wall adapted to allow for re-attachment of the first chamber to the second chamber.
6. The junction box of claim 1 , wherein replacing the first chamber does not require disconnecting the second chamber from the photovoltaic panel.
7. The junction box of claim 1 , wherein the first chamber is hermetically sealed against an ingress of water or humidity.
8. The junction box of claim 7 , wherein a bus bar is sealed in the wall so as to preserve a level of hermiticity of the first chamber.
9. The junction box of claim 1 , wherein the heat sink includes a dovetail structure adapted to prevent mutual separation of the heat sink from the junction box.
10. The junction box of claim 1 , wherein the first chamber is covered by a first lid.
11. The junction box of claim 10 , wherein the second chamber is covered by a second lid.
12. The junction box of claim 11 , wherein the second chamber is accessible by opening the second lid.
13. The junction box of claim 11 , wherein the first lid and the second lid are on opposite sides of the junction box.
14. A method comprising:
physically separating a first chamber and a second chamber with a wall common to the first chamber and the second chamber;
attaching a heat sink in the first chamber;
providing an electrical connection to a photovoltaic panel via an electrical connector disposed in the second chamber;
disposing a circuit board for electrical power conversion in the first chamber; and
configuring the heat sink to dissipate heat generated by the circuit board, the circuit board electrically connected, through the wall, to the electrical connection in the second chamber.
15. The method of claim 14 , wherein a bus bar is sealed in the wall.
16. The method of claim 15 , wherein the bus bar provides electrical connectivity between the circuit board and the electrical connector.
17. The method of claim 14 , wherein the wall comprises a double wall adapted to allow for mutual separation of the first chamber from the second chamber.
18. The method of claim 14 , wherein the wall comprises a double wall adapted to allow for re-attachment of the first chamber to the second chamber.
19. The method of claim 14 , wherein replacing the first chamber does not require disconnecting the second chamber from the photovoltaic panel.
20. The method of claim 14 , wherein the first chamber is hermetically sealed against an ingress of water or humidity.
21. The method of claim 14 , wherein a bus bar is sealed in the wall, the bus bar configured to preserve a level of hermiticity of the first chamber.