The present invention relates to a system for mounting photovoltaic panels. In particular, the present invention relates to a system that provides for fast attachment and removal of photovoltaic panels from a support structure.
Photovoltaic (“PV”) modules, also known as solar panel modules, are typically mounted to support structures and include a photovoltaic panel and the associated electrical wiring for connecting the module to a desired circuit. PV modules are typically installed on the roofs of buildings or homes in order to place them in the best position for receiving the direct and uninterrupted sunlight that is necessary to generate electricity. However, mounting the modules on such structures can be difficult since they need to be properly aligned in order to work most efficiently and also to be more aesthetically pleasing.
PV modules are mounted on a support structure that typically consists of a plurality of spaced elongate rails. The rails are designed to accommodate one or more PV panels along their length. Such rails must be properly aligned and spaced from each other in order to provide a mounting surface and attachment points that correspond to the mounting apertures in the PV module. If one rail is not parallel to the other and spaced appropriately from the other to provide the correct amount of support for the module installation, the attachment points will not align with the mounting apertures in the PV panels. Also, rails may have to be adjusted in length to accommodate a particular installation. Therefore, a significant amount of time and effort must be expended on top of a roof to install and align the rails.
The installation of the PV panel systems on the roofs of structures can be a time consuming operation and a significant part of the cost for an owner. First, the support structure has to be attached to the roof and then each panel must be secured to the support structure using a plurality of fastening devices. Therefore, anything that reduces the installation time reduces the overall cost of the PV panel system. Since a large number of fastening devices are used to secure the PV panels to the support structure, reducing the time needed for installing the fastening devices would reduce the overall time required for installing the PV panel system.
Accordingly, there is a need for a fastening system that uses fastening devices that can be installed easily and in less time than the fastening devices currently being used.
In accordance with the present invention, a photovoltaic panel mounting system is provided. The photovoltaic panel mounting system comprises, consists of or consists essentially of a pair of spaced mounting rails, one or more fastener retaining devices and a plurality of quick access fasteners. Each of the pair of spaced mounting rails includes a first end, a second end and a plurality of mounting holes. The one or more fastener retaining devices are aligned with the plurality of mounting holes in each of the rails. Each of the quick access fasteners is removably secured to one of the rails through one of the plurality of mounting holes. The quick access fasteners are securable and removable to one of the one or more fastener retaining devices with less than one revolution of the quick access fastener. The plurality of the quick access fasteners can be quarter turn fasteners and they can have a head with a shaft extending therefrom to a distal end.
In a preferred embodiment, the one or more fastener retaining devices includes a rod extending along the length of the rail or a pin in the rail located at each of the plurality of mounting holes. The quarter turn fastener has an engaged position and a disengaged position. When in the engaged position, the fastener, preferably a notch at the distal end, engages the rod and the fastener is secured to the mounting rail. When in the disengaged position, the fastener does not engage the rod and the fastener is not secured to the mounting rail.
Each of the spaced mounting rails is elongated and has a base, first and second side walls extending upwardly therefrom and one or more top plates; preferably first and second top plates. The side walls can be substantially parallel or they can extend from the bottom wall to the top plate at an angle to provide additional structural strength. In a preferred embodiment, the side walls and the bottom wall and top plate have a trapezoidal shape, when viewed form one of the ends of the rail. The first and second top plates extend inwardly from the side walls and parallel to the base to define an interior. Preferably, the plurality of mounting holes is formed in the first top plate. In addition, each of the pair of spaced mounting rails can include a passage having a first end and a second end corresponding to the first and second ends of the rails. The passage is located in the interior and is in communication with the plurality of mounting holes. In preferred embodiments, the one or more fastener retaining devices are positioned in the passage; most preferably, the rod is positioned in the passage. The rod can also be attached to the rail by a plurality of clips that attach to a lip on the top wall of the rail.
In another embodiment, each of the pair of spaced mounting rails has a first end, a second end, a bottom wall, a top plate and one or more side walls therebetween. The bottom wall, top plate and one or more side walls define an interior and an exterior and the top plate has a plurality of mounting holes. The one or more fastener retaining devices, preferably a rod extending the length of the passage, are located in the interior and align with the plurality of mounting holes in each of the rails. The passage is in communication with the exterior through the plurality of mounting holes. Preferably, the passage is formed by two curved walls extending from the top plate into the interior.
The preferred embodiments of the photovoltaic panel system of the present invention, as well as other objects, features and advantages of this invention, will be apparent from the accompanying drawings wherein:
The present invention provides a mounting system for photovoltaic (“PV”) panels. The PV panels may be frameless solar panels having mounting apertures (i.e., through holes) formed therein in order to receive quick access fasteners, also referred to as quick release fasteners. The use of traditional threaded fasteners in a solar mounting system, which require five or more 360-degree revolutions to secure, takes time and can be cumbersome. Unlike traditional screw fasteners that require multiple revolutions for them to be secured, the use of the quick access fasteners reduces the time it takes to install the solar panels. Quick access fasteners may be secured and removed to a structure with less than one revolution. One type of quick release fastener is known in the art as a quarter turn fastener since it can be moved between a secured and unsecured position with only a quarter revolution (i.e., 90 degrees) of the fastener. The use of quick access fasteners allows the PV panels to be quickly and securely fastened to the rails of the support structure and removed therefrom.
In a typical installation of the photovoltaic panel mounting system of the present invention, the pair of rails is positioned on a structure, such as a roof, and spaced apart so that the mounting holes in the top plates of the rails correspond with the mounting apertures in the photovoltaic panel. The rails are then secured to the structure and, in a preferred embodiment, a rod is inserted into the passage located on the interior side of the top plate. The passage is in communication with the plurality of holes in the top plate. The solar panel is then positioned on the pair of rails so that the mounting apertures in the photovoltaic panel are aligned with the holes in the top plate. Optionally, one or more insulators can be positioned between the top plate of the rail and the photovoltaic panel. The quick access fasteners are then inserted in the mounting apertures of the photovoltaic panel, pass through the optional insulator and holes in the top plate of the rail. The quick access fasteners are then rotated in the clockwise direction, preferably one-half turn, more preferably one-quarter turn to engage the rod in the passage and secure the photovoltaic panel to the mounting system. The photovoltaic panel can be quickly and easily removed from the mounting system by rotating the quick access fasteners in a counter-clockwise direction or by removing the rod from the passages in the pair of mounting rails.
As used herein, the term “quarter turn fastener” refers to a fastening device that is fully tightened by rotating the device one-quarter of a revolution or 90-degrees. The fastening device has a head with a shaft extending therefrom to a distal end. The head is used to turn or rotate the shaft and the distal end has various designs that can engage a structure by rotating the shaft one-quarter turn. For example, the shaft can have a notch that receives the retaining device and is secured by rotating the fastener. Quick access securement fasteners known in the art include Dzus® quarter turn fasteners or other similar type fasteners. Such quick access fasteners are also marketed by DFCI Solutions, Inc. under their quarter turn-ST-1200 line.
By using the quick attach and release fasteners, an installer of the PV panels can quickly attach the panel to the rail. Often these PV panels are placed on roofs or overhead structures where installment can be difficult. Therefore, the ability to quickly attach the panels significantly eases the installation process. In addition, if a panel needs to be replaced the fasteners need only be rotated a portion of a revolution to release the panel from the rail allowing a new panel to be installed.
In the mounting system of the present invention, no torque specifications are necessary with the use of the quick access fasteners. The fastener is either off and loose or on and tight. This reduces the amount of tools needed to install the solar system. In particular, the use of a quarter turn fastener is beneficial since the use of mounting hardware extending directly through a PV panel can break the solar panel due to over tightening. The use of the quick access quarter turn fastener reduces this risk.
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In order to secure the fastener 36 within the mounting holes 30, the end of the fastener 36 is inserted into the hole 30 so that the fastener passage engages the rod 34. The fastener 36 is then turned, which causes the fastener to be pulled toward the rail 12 to a secured position. To remove the fastener 36, the fastener 36 is turned in the opposite direction (i.e., counter clockwise) causing the fastener 36 to disengage the rod 34, thereby permitting the fastener 36 to be removed from the hole 30.
The fasteners 36 are used to secure the PV panels 14 to the rails 12. Typically, PV panels 14 are formed with holes 40 extending there through to receive the fasteners 36. With reference to
PV panels 14 are installed by first securing a pair of spaced rails 12 to the support structure 13. The PV panel 14 is then placed over the rails 12 and the PV panel holes 40 are aligned with the rail mounting holes 30. A quick access fastener 36 may then be placed through the aligned holes 40, 30 in the panel 14 and rails 12. Downward pressure on the head of the fastener 36a compresses the pad 42 and the fastener 36 is turned to secure it to the rod 34 in the rail 12. Turning of the fastener 36 to the secured position tends to pull it toward the rail 12, further compressing the pad 42. When the panel 14 is secured via the fastener 36, the resilient pad 42 is compressed as the fastener 36 is drawn toward the rail 12. The tension provided by the compressed pad 42 helps to maintain the fastener 36 in the secured position. In order to remove the fastener 36, the head 36a of the fastener 36 is pressed down to compress the pad 42 and then turn the fastener 36 toward the open or unsecured position. The fastener 36 may be removed and the PV panel 14 then lifted off the mounting rail 12.
The rail 12 may have different configurations to conform to the design and the mounting hole locations of the PV panel. With reference to
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The clip 102 may include a top 114 and bottom 116 opposed projections connected at one end by a loop 118. The clip 102 may be formed of a resilient material such as steel, and the top and bottom projections are biased toward each other. The bottom projection 116 may include a notch 120 formed therein to receive the rod 34. The clip 102 is inserted on the rail 100 by placing the lip between the top and bottom clip portion. The clip 102 is then pushed further onto the rail 100 toward the central wall 104. A stop 121 depends downwardly from the top portion adjacent the loop 118. The stop 121 engages the rail 100 when the clip 102 is fully inserted on the rail. The clip bottom portion 116 bay have a leading edge 122 which is curved away from the top portion 114. This facilitates placement of the clip 102 on the rail 100. A plurality of clips 102 may be placed along the length of the rail 100 to secure the rod 34 thereto.
When the clips 102 are in place, the rod 34 may be slid into the notches 120. This may be done by aligning the rod 34 with the length of the rail 100 and sliding the rod 34 into the notches 120. Alternatively, the rod 34 may first be placed inside the rail 100 and the clips 102 placed on the rail 100 and over the rod 34.
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Thus, while there have been described the preferred embodiments of the present invention, those skilled in the art will realize that other embodiments can be made without departing from the spirit of the invention, and it is intended to include all such further modifications and changes as come within the true scope of the claims set forth herein.
This application claims priority from provisional application Ser. No. 61/878,995, filed on Sep. 17, 2013, which is incorporated herein in its entirety.