US20150325738A1

US20150325738A1 - Solar Photovoltaic Module Clamping System

Info

Publication number: US20150325738A1
Application number: US14/612,783
Authority: US
Inventors: Martin Seery; Ty Hudson
Original assignee: SolarCity Corp
Current assignee: SolarCity Corp
Priority date: 2014-05-12
Filing date: 2015-02-03
Publication date: 2015-11-12
Also published as: US20150326169A1; EP3099984A1; US8957302B1; CN106134069B; US9912285B2; CN204761372U; WO2015175275A1; MX373967B; CN106134069A; MX2016010582A; EP3099984B1; US9473065B2; US20170033731A1

Abstract

A clamping system for securing the corners of four photovoltaic modules to a carport purlin, the clamping system having upper and lower body portions with a size adjustable gap to receive the purlin therein, and a pair of rotating connectors at opposite ends of the clamp assembly, each rotating connector having arms extending from opposite sides, the arms being rotated to lock into side grooves in the photovoltaic modules.

Description

RELATED APPLICATION

The present application is a continuation of U.S. application Ser. No. 14/592,594, filed Jan. 8, 2015, and entitled A Solar Photovoltaic Module Clamping System, which is a continuation of U.S. application Ser. No. 14/301,522, filed Jun. 11, 2014, and entitled A Solar Photovoltaic Module Clamping System, which claimed priority to U.S. Provisional Patent Application Ser. No. 61/992,118 of same title, filed May 12, 2014.

TECHNICAL FIELD

The present invention relates generally to mounting systems for solar photovoltaic module arrays, and in particular to systems that mount photovoltaic modules onto carport purlins.

BACKGROUND OF THE INVENTION

Solar photovoltaic module arrays have been assembled onto building roofs for years. During installation, the installers typically work on the roof above the modules. However, a more recent trend has been to install solar photovoltaic module arrays such that they make up the “roof” of a carport. Such carport installations are becoming more common in business parking lots, especially in the southwestern United States. These solar carports offer the dual benefits of providing electricity generation, while also shading the cars parked below the solar module arrays.
Building these solar module array carports offer special challenges. First and foremost, there is no building “roof” on which the installers stand when assembling the module arrays. Instead, the modules themselves make up the “roof” of the structure. Therefore, carport solar module arrays are essentially assembled from below, with the individual modules being lifted above the operators and fastened onto the purlins/beams that support the modules.
Unfortunately, an ideal solution as to how to assemble a photovoltaic module array onto the purlins from below has proved to be a challenge. What is instead desired is a fast and simple system for fastening successive photovoltaic modules onto the purlins of the carport (such that the module array can be quickly and easily formed). Ideally, this new system would enable the installers to work from below the formed arrays as much as possible. As will be shown, the present invention provides such a system. In addition, the present system is not limited to carports. It can be used on various ground mount structures as well.

SUMMARY OF THE INVENTION

The present invention provides a clamping assembly for securing the corners of four photovoltaic modules to a beam or purlin, comprising: (a) an upper body portion; (b) a lower body portion extending from the upper body portion so as to form a gap between the upper and lower body portions, the gap being dimensioned to receive a portion of a beam or purlin therein; (c) a rotating connector at each of the opposite ends of the upper body portion, each rotating connector having arms extending from opposite sides, wherein the arms are dimensioned to secure modules together, for example by locking into side grooves in a pair of adjacent photovoltaic modules; and (d) a fastener in the lower body portion, wherein the fastener adjusts the size of the gap between the upper and lower body portions into which the portion of the beam is received (so as to secure the clamping assembly onto the beam or purlin).
In preferred aspects, the beams or purlins form the structure of a carport, with the photovoltaic modules spanning between the purlins, forming the “roof” of the carport.
An advantage of the present clamping assembly is that it can be used to simultaneously hold together the corners of four different photovoltaic modules, with the tightening and locking functions/operations all being accessible from below the array.
Each of the rotating connectors fastens onto two photovoltaic modules. By having a rotatable connector at opposite ends of the clamping assembly, a single clamping assembly can be used to secure the corners of four different photovoltaic modules together. Preferably, each one of the rotating connectors have a pair of arms that can be rotated to a position where they lock into the side groove of a photovoltaic module. Thus, rotation of one connector secures two adjacent photovoltaic modules together. Preferably as well, the bottom ends of the rotating connectors are threaded and a nut is provided to tighten them into their final locked position. During installation, the operator first tightens the fastener in the lower body portion (to secure the clamping assembly onto the purlin/beam). Next, the installer positions the modules next to the clamping assembly and rotates the connectors such that they lock into side grooves in the modules.
One advantage of the present system is that it works with different beams and purlins of different shape. Another advantage of the present system is that it is easy to install and operate from below the array. Yet another advantage of the present system is that it allows for mid-module removal.

BRIEF DESCRIPTION OF THE DRAWINGS:

FIG. 1 is a first perspective view of the clamping assembly.

FIG. 2 is a second perspective view of the clamping assembly.

FIG. 3 is a side elevation view of the clamping assembly.

FIG. 4 is an end elevation view of the clamping assembly.

FIG. 5 is a bottom perspective view of one of the rotating connectors.

FIG. 6 is a perspective view of the clamping assembly attached onto a purlin.

FIGS. 7A to 7C are side elevation view of the clamping assembly fastened to three different purlins.

FIGS. 8A to 8D are successive end elevation views showing the installation of a pair of photovoltaic modules onto one of the rotating connectors.

FIGS. 9A to 9D are successive end elevation views showing movement of the rotating connector to disengage the photovoltaic modules such that one of the modules can be removed for maintenance.

FIG. 10 is a perspective view of an assembled carport photovoltaic module array.

FIG. 11 is a close-up view of a portion of the assembled array seen in FIG. 10.

FIG. 12 is another close-up view of a portion of the assembled array seen in FIG. 10.

DETAILED DESCRIPTION OF THE DRAWINGS

FIGS. 1 to 4 show different views of the clamping assembly. FIG. 5 shows further details of one of the rotating connectors of the clamping assembly. FIGS. 6 to 7C show the clamping assembly attached to a purlin. FIGS. 8A to 8D show the installation of a pair of photovoltaic modules onto one of the rotating connectors. FIGS. 9A to 9D show disengagement of one of the photovoltaic modules for removal/maintenance. FIGS. 10 to 12 show further details of an assembled carport photovoltaic module array.
Referring first to FIGS. 1 to 4, a clamping assembly 10 for securing photovoltaic modules to a beam or purlin is provided. Clamping assembly 10 comprises: an upper body portion 20; a lower body portion 30. Lower body portion 30 extends downwardly from upper body portion 20 so as to form a gap 40. Gap 40 is dimensioned to receive a portion of a beam/purlin 100 (see FIGS. 6 to 7C) therein.
Clamping assembly 10 also includes a pair of rotating connectors 22 at opposite ends of upper body portion 20. Each rotating connector 22 has a pair of arms 24 extending from its opposite sides. As will be shown, arms 24 are dimensioned to lock into side grooves in a pair of adjacent photovoltaic modules. Finally, clamping assembly 10 includes a fastener 50 in lower body portion 30. Fastener 50 adjusts the size of gap 40 between upper and lower body portions 20 and 30. As can be seen, lower body portion 30 preferably extends from one side of upper body portion 20 so as to form a generally C-shaped clamping assembly.
Each rotating connector 22 is received through a hole 23 in an opposite end of upper body portion 20. In preferred embodiments, each rotating connector 22 comprises: an upper portion 25 from which arms 24 extend; a threaded bottom portion 26; and a nut 28 on threaded bottom portion 26. As can be seen, upper portion 25 is positioned above hole 23, threaded bottom portion 26 passes through hole 23 and nut 28 is positioned below hole 23.
In optional preferred embodiments, holes 23 are notched such that rotating connectors 22 sit with their arms 24 perpendicular to an axis passing through the center of both of the rotating connectors when nuts 28 on the threaded bottom portion are tightened. This positioning of rotating connectors 22 is seen in the installed views of FIGS. 11 and 12. In optional preferred embodiments, one of arms 24 of each of the rotating connectors 24 has a downwardly facing tooth 27 thereon.
In optional preferred embodiments, fastener 50 comprises a bolt 51 passing through a threaded hole 52 in lower body portion 30. Preferably, the head of bolt 51 is positioned below hole 52, as shown. Optionally, a torque nut 54 received around bolt 51. As can be seen, the head of bolt 51 preferably has a smaller diameter than torque nut 54. The advantage of this is that an installer first tightens bolt 51 to secure the clamping assembly 10 to the carport purlin. Next, the installer tightens torque nut 54 over bolt 51. This securely fastens clamping assembly 10 to the carport purlin. Advantageously, since the diameter of the head of bolt 51 is smaller than the diameter of torque nut 54, the installer can use a tightening tool on torque nut 54 that simply slips over the smaller diameter of the head of bolt 51 (after bolt 51 has first been secured into position). Advantageously, both the tightening of bolt 51 and torque nut 54 can be done by the installer working below the array.
FIG. 5 shows further structural details of the rotating connector 22. For example, a slot 29 may be provided in the bottom of threaded portion 26. Slot 29 is ideally suited for mid-module removal (by reversing the locking steps described below). Specifically, an installer can insert a screwdriver into slot 29 and rotate connector 22 such that arms 24 can be rotated to lock into side grooves in a pair of photovoltaic modules. By having slot 29 at the bottom side of clamping assembly, it is accessible from underneath the array. Thus, the locking of arms 24 into the photovoltaic modules can be done while working below the array. In addition, an optional grounding rib 21 can be included. When rotated into its final locked position, the grounding rib 21 will cut into the anodized surface of the module, thereby providing a grounding module-to-module contact.
FIG. 6 shows clamping assembly 10 fastened onto the top of a purlin 100. FIGS. 7A to 7C show the versatility of the clamping system as it can be used to connect to purlins of different shapes and cross sections (e.g.: purlins 100A, 100B and 100C). After the top end of the purlin is inserted into gap 40, then fastener 50 is tightened (such that the top of bolt 51 is received against the inside of the purlin). Next, torque nut 54 is tightened, thereby preventing bolt 51 from loosening.
FIGS. 8A to 8D are successive end sectional elevation views showing the installation of a pair of photovoltaic modules onto one of the rotating connectors, as follows. First, as seen in FIG. 8A, the side edge of a photovoltaic module frame 200A is placed on top of upper portion 20 sitting adjacent to rotating connector 22. As can be seen, photovoltaic module frame 200A has a side groove 202 therein. Next, as seen in FIG. 8B, an installer pushes or pulls upwardly (preferably from below) on the bottom of rotating connector 22, lifting rotating connector 22, and then rotates rotating connector 22 by ninety degrees in direction R such that arm 24 is received into side groove 202 of frame 200A. Next, as seen in FIG. 8C, the installer lowers rotating connector 22 (such that tooth 27 fits down into a bottom portion of the side groove 202) and then partially tightens nut 28, thereby securing frame 200A into a locked position. (At this time, rotating connector 22 sits down into notch 23, preventing the connector from rotating). Finally, as is seen in FIG. 8D, the installer slips a second photovoltaic module frame 200B onto the “toothless” arm 24. Nut 28 can be further tightened as needed to secure photovoltaic module frames 200A and 200B onto clamping assembly 10. The advantage of having tooth 27 on only one of the pair of arms 24 is that the second module 200B can be removed if needed (by loosening nut 28). In addition, this allows for adjustment of the photovoltaic module on the side without the tooth, such that the module can be pulled out slightly for adjustment.
FIGS. 9A to 9D are successive end elevation views showing movement of the rotating connector to disengage the photovoltaic modules (e.g.: mid-array module 200B in FIG. 10) such that one of the modules can be removed for maintenance, as follows. FIG. 9A begins at the same point in time as FIG. 8D. Next, in FIG. 9B, the installer loosens nut 28. Next, in FIG. 9C, the installer pushes up on the bottom of bottom portion 26 (for example with the end of a screwdriver received into slot 29). Finally, in FIG. 9D, the installer rotates bottom portion 26 in direction R2 by ninety degrees such that arms 24 unlock from side grooves 202 in each of module frames 200A and 200B.
FIGS. 10 to 12 show an assembled carport photovoltaic module array according to the present system (FIG. 10), with close-up views of portions of the array (FIGS. 11 and 12).
An array 300 of photovoltaic modules 200 forms the “roof” of the carport. Array 300 thus is mounted onto purlins 100 by a plurality of clamping assemblies 10. FIG. 11 shows a view of an end of array 300. As can be seen, a single clamping assembly 10 holds the corners of two adjacent photovoltaic modules 200 together. FIG. 12 shows a view of four adjacent photovoltaic modules 200 (however, one of the photovoltaic modules 200B has been removed for clarity). As can be seen, the single clamping system 10 holds the four corner edges of the photovoltaic modules together, with each rotating connector 22 being positioned such that its arms 24 are rotated to lock into the side grooves 202 of the photovoltaic modules 200. As can also be seen, the four corners of the photovoltaic modules 200 are held together at a position over purlin 100.

Claims

What is claimed is:

1. A method of assembling a photovoltaic array, comprising:

(a) securing a clamping assembly onto a beam by inserting the beam into a gap between an upper portion and a lower portion of the clamping assembly, and then tightening a fastener extending downwardly from below the lower portion of the clamping assembly, thereby securing the beam between the upper portion and the lower portion of the clamping assembly;

(b) placing a side edge of a first photovoltaic module onto an upper surface of the clamping assembly;

(c) rotating a first rotating connector on the clamping assembly to secure the first rotating connector to the side edge of the first photovoltaic module; and

(d) placing a side edge of a second photovoltaic module onto the upper surface of the clamping assembly, wherein the side edge of the first photovoltaic module and the side edge of the second photovoltaic are positioned on opposite sides of the first rotating connector, and wherein the side edge of the second photovoltaic module is secured to the first rotating connector.

2. The method of claim 1, wherein the fastener on the clamping assembly is tightened by an installer positioned below the beam reaching upwardly and rotating the fastener.

3. The method of claim 1, wherein the first rotating connector on the clamping assembly is rotated by an installer positioned below the beam reaching upwardly and rotating the first rotating connector.

4. The method of claim 3, wherein rotating the first rotating connector is performed by the installer inserting a screwdriver into a slot of the bottom of the first rotating connector, and then rotating the first rotating connector.

5. The method of claim 1, wherein the first rotating connector is rotated by 90 degrees to secure the first rotating connector to the side edges of the first and second photovoltaic modules.

6. The method of claim 1, wherein the first rotating connector has arms extending from opposite sides thereof, and one arm is received into a side groove in a frame of the first photovoltaic module and the other arm is received into a side groove in a frame of the second photovoltaic module.

7. The method of claim 6, further comprising tightening a nut onto a threaded bottom portion of the first rotating connector, thereby holding the first rotating connector in a final locked position in a hole passing through the upper body portion.

8. The method of claim 1, further comprising:

(e) placing a side edge of a third photovoltaic module onto the upper surface of the clamping assembly;

(f) rotating a second rotating connector on the clamping assembly to secure the second rotating connector to the side edge of the third photovoltaic module; and

(g) placing a side edge of a fourth photovoltaic module onto the upper surface of the clamping assembly, wherein the side edge of the third photovoltaic module and the side edge of the fourth photovoltaic are positioned on opposite sides of the first rotating connector, and wherein the side edge of the fourth photovoltaic module is secured to the second rotating connector,

such that the upper support surface of the clamping assembly supports corners of each of the four photovoltaic modules thereon.

9. The method of claim 1, wherein the beam is a beam in a carport roof.