Systems and methods for improved installation and grounding of photovoltaic assemblies
View Patent ↗Improved PV assemblies for converting solar radiation to electrical energy and methods of installation thereof are disclosed herein. PV arrays comprising a plurality PV modules are also described herein. A PV assembly can comprise a plurality of PV modules arranged into rows and/or columns of a PV array. A PV module can comprise a plurality of solar cells encapsulated within a PV laminate. In some embodiments, a PV module includes a frame at least partially surrounding the PV laminate. A PV assembly can further comprise at least one flexible grounding connector positioned between a plurality of PV modules, adjacent rows of PV modules in an array and/or a column of PV modules in an array. A flexible grounding connector can comprise a first and a second engagement head for engaging a first and a second PV module. A flexible grounding connector can further comprise a flexible body portion coupling first and second engagement heads. The flexible body portion of the flexible grounding connector can be electrically conductive so as to provide an electrical grounding path between first and second PV modules and accommodate any misalignment or offset between first and second PV modules.
1. A photovoltaic (PV) assembly comprising:
a first row of a PV array;
a second row of a PV array adjacent to the first row, wherein the first and second rows each comprise:
a plurality of PV modules, each PV module having a front side that faces the sun to collect solar radiation during normal operation and a back side opposite the front side, each PV module comprising:
a laminate encapsulating a plurality of solar cells;
a metal frame surrounding the laminate to define an outer side edge of the PV module;
a flexible grounding connector positioned between the first and second rows, the flexible grounding connector comprising:
a first electrically conductive clamping head for engaging the outer side edge of a first PV module in the first row of the PV array;
a second electrically conductive clamping head for engaging the outer side edge of a second PV module in the second row of the PV array;
the first and second electrically conductive clamping heads each comprising:
an upper and lower clamping portion comprising at least one slot formed therethrough for receiving at least one fastener;
at least one pierce point configured to bear against the outer side edge of a PV module when the upper and lower clamping portions are secured by the fastener, thereby providing an electrical grounding path;
each flexible grounding connector further comprising an electrically conductive flexible body portion coupling the first and second clamping heads, the flexible body portion being flexible in a first direction substantially perpendicular to the outer side edge of the first and second PV modules, and wherein the flexible grounding connector provides an electrical grounding path between the first and second rows of the PV assembly.
2. The PV assembly according to claim 1 , wherein the flexible body portion comprises a serpentine structure.
3. The PV assembly according to claim 2 , wherein the serpentine structure comprises a plurality of square waves.
4. The PV assembly according to claim 1 , wherein the frame comprises a longitudinally extending ridge, and wherein the upper and lower clamping portions of the flexible grounding connector are configured to engage the longitudinally extending ridge of the frame.
5. A photovoltaic (PV) assembly comprising:
a first and second PV module each comprising:
a laminate comprising a plurality of solar cells;
a frame at least partially surrounding the laminate;
at least one flexible grounding connector positioned between the first and second PV modules, the at least one flexible grounding connector comprising:
a first electrically conductive engagement head for engaging the first PV module;
a second electrically conductive engagement head for engaging the second PV module;
a flexible body portion coupling the first and second electrically conductive engagement heads, the flexible body portion being electrically conductive;
wherein the flexible grounding connector provides an electrical grounding path between the first and second PV modules, and
wherein the flexible grounding connector is formed as a single metal piece comprising a first and a second end, the first and second ends of the flexible grounding connector being curved to form the first and second electrically conductive engagement heads, and wherein the first and second electrically conductive engagement heads each comprise an upper clamping portion, a lower clamping portion and a hinge portion therebetween.
6. The PV assembly according to claim 5 , wherein the first module is positioned in a first row of a PV array, the second module is positioned in a second row of the PV array, and the first row of the PV array is adjacent to the second row of the PV array.
7. The PV assembly according to claim 5 , wherein the first and second electrically conductive engagement heads each comprise at least one pierce point configured to bear against the frame of a PV module.
8. The PV assembly according to claim 5 , wherein the frame comprises a longitudinally extending ridge, and wherein the upper and lower clamping portions of the flexible grounding connector are configured to engage the longitudinally extending ridge of the frame.
9. The PV assembly according to claim 5 , wherein the first and second electrically conductive engagement heads each comprise at least one slot formed therethrough for receiving at least one fastener.
10. The PV assembly according to claim 5 , wherein the flexible body portion comprises a structure selected from the group of a serpentine structure, a braided structure, a spring tensioned structure, a sinusoidal shaped structure, an S-shaped structure, a spiral structure, a coil, a spring, or a combination thereof.
11. The PV assembly according to claim 5 , wherein the flexible body portion is flexible in a first direction substantially perpendicular to an outer side edge of the PV module.
12. The PV assembly according to claim 11 , wherein the flexible body portion is deformable to a distance greater that 5 mm along the first direction.
13. The PV assembly according to claim 5 , wherein the electrically conductive engagement head engages an outer surface feature located at an outer side edge of the PV module.
14. The PV assembly according to claim 5 , wherein the electrically conductive engagement head engages an outer surface feature located at a back side of the PV module.
15. The PV assembly according to claim 5 , wherein the flexible body portion has a width less than 20 mm.
16. A flexible grounding connector for electrically connecting adjacent rows of a PV array, the flexible grounding connector comprising:
a first electrically conductive clamping head for engaging a first PV module in a first row of the PV array;
a second electrically conductive clamping head for engaging a second PV module in a second row of the PV array, the first and second electrically conductive clamping heads each comprising:
an upper and lower clamping portion comprising at least one slot formed therethrough for receiving at least one fastener;
at least one pierce point configured to bear against an outer surface of a PV module when the upper and lower clamping portions are secured by the fastener, thereby providing an electrical grounding path;
the flexible grounding connector further comprising an electrically conductive flexible body portion coupling the first and second clamping heads, the flexible body portion being flexible in a first direction substantially perpendicular to an outer side edge of the first and second PV modules, and wherein the flexible grounding connector provides an electrical grounding path between adjacent rows of the PV array.
17. The flexible grounding connector according to claim 16 , wherein the flexible body portion is deformable to a distance greater that 5 mm along the first direction.
18. The flexible grounding connector according to claim 16 , wherein the flexible body portion comprises a structure selected from the group of a serpentine structure, a braided structure, a spring tensioned structure, a sinusoidal shaped structure, an S-shaped structure, a spiral structure, a coil, a spring, or a combination thereof.
19. The flexible grounding connector according to claim 16 , wherein the flexible grounding connector is formed as a single metal piece comprising a first and a second end, the first and second ends of the flexible grounding connector being curved to form the first and second electrically conductive clamping heads, and wherein the first and second electrically conductive clamping heads each comprise a hinge portion between the upper and lower clamping portions.