1. Field of the Invention
Embodiments of the present invention generally relate to a device and method for mounting and supporting solar panels.
2. Description of the Related Art
Due to environmental concerns and the rise in the cost of traditional energy sources, the demand for use of renewable energy sources is steadily increasing. In particular, significant resources are being invested in developing low cost panels for the production of electricity from solar energy. However, many challenges remain in achieving this goal, such as efficient, low cost mounting of solar panels both in filed and rooftop environments.
Typically, solar panels are manufactured in a planar, rectangular configuration. A frame is then attached around the perimeter of the panel to facilitate mounting. Brackets are then attached to the frame about the perimeter of the panel via screws or some other mounting hardware. The brackets are then typically attached to mounting rails, which are attached to a structure that is to support the solar panel. This configuration and mounting approach results in a bulky solar panel configuration while adding significant cost to the production of the panel as well as the ultimate field installation.
Another approach is to mount a solar panel absent a frame. A typical embodiment is illustrated in
For example, this approach requires that the clamping members 120 be stiff and strong enough to support the panels 110 under significant loading from typical adverse environmental conditions, such as wind, ice, and snow. To accomplish this, the clamping members 120 are typically comprised of aluminum extrusions, designed to allow very little deflection. As a result of this design approach, high stress concentrations develop at the edges of the glass solar panels 110 under load. Thus, breakage of the solar panel 110 becomes a problem having significant repair/replacement expenses associated therewith.
Additionally, solar panels, by their very nature, are exposed to high temperature loading via exposure to solar radiation. At these high temperatures, the lamination material contained within the panels can liquefy. As a result, panels that are solely mounted by clamping at the perimeter may slip and shift out of position, which often results in improper orientation or breakage of the solar panel.
Accordingly, a need exists for a simple and cost effective device and method for mounting and supporting solar panels in a variety of environments.
In one embodiment of the present invention, a solar panel assembly comprising a solar panel having a light receiving surface and a non-light receiving surface, a substantially V-shaped support member having a corrosion resistant coating, and a moisture resistant adhesive bonding member attaching the substantially V-shaped support member to the non-light receiving surface of the solar panel, wherein the substantially V-shaped member substantially spans a length of the solar panel.
In another embodiment of the present invention, a solar panel support attachment module comprises a system controller configured to send and receive commands, a solar panel cleaning region configured receive commands from the system controller and clean a non-light receiving surface of the solar panel, a solar panel drying module configured to receive commands from the system controller and dry the non-light receiving surface of the solar panel, a support member placement module configured to receive commands from the system controller and position a support member on the non-light receiving surface of the solar panel, a support member attachment module configured to receive commands from the system controller and attach the support member to the non-light receiving surface of the solar panel, and an automation system configured to receive commands from the system controller and move the solar panel through the solar panel support attachment module.
In another embodiment of the present invention, a method for attaching a support member to a solar panel comprises receiving the solar panel onto an automation device, positioning the solar panel within a cleaning module via the automation device, cleaning a non-light receiving surface of the solar panel, transferring the solar panel into a drying module via the automation device, drying the non-light receiving surface of the solar panel, transferring the solar panel into a support member placement module via the automation device, positioning a support member onto the non-light receiving surface of the solar panel, transferring the solar panel into a support member attachment module via the automation device, and attaching the support member to the non-light receiving surface of the solar panel.
In another embodiment of the present invention, a solar panel support assembly comprises a lower support structure, a lower transverse support rail attached to the lower support structure, an upper transverse support rail attached to the lower support structure, and an adhesive member affixed to the lower transverse support rail and the upper transverse support rail and configured to adhere to a non-light receiving surface of the solar panel. In one embodiment, the lower transverse support rail has a plurality of slots disposed therein each configured to receive a solar panel support member affixed to the solar panel. In one embodiment, the upper transverse support rail has a plurality of slots disposed therein each configured to receive the solar panel support member affixed to the solar panel.
In yet another embodiment of the present invention, a method for mounting a solar panel comprises affixing an adhesive member to an upper mounting surface of a lower transverse rail and an upper mounting surface of an upper transverse rail of a grounded lower support member, positioning the solar panel onto the adhesive member of the lower transverse rail and the upper transverse rail, and attaching the solar panel to the upper mounting surface of the lower transverse rail and the upper mounting surface of the upper transverse rail.
So that the manner in which the above recited features of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only typical embodiments of this invention and are therefore not to be considered limiting of its scope, for the invention may admit to other equally effective embodiments.
The present invention generally relates to a simple and cost effective device and method for mounting and supporting solar panels. A solar panel according to the present invention is supported from the backside via a plurality of elongated support members. The elongated support members may have open V-shaped or W-shaped arrangements strong enough to support a solar panel under the required loading but flexible enough to minimize the maximum stress experienced by the solar cell during normal operation and exposure to the environment. The support members may be adhered to the solar panels through strong, flexible glue or double-sided tape that withstands significant environmental loads, such as wind uploading, yet remain flexible enough to minimize stress concentrations in the solar panels. The support members may be attached to a solar panel by a support member attachment module incorporated into an automated solar panel production line. A plurality of solar panels may be field mounted to a solar panel support structure having one or more piles or the like with at least a lower and upper transverse support rails spanning the plurality of solar panels. Each solar panel may be further retained by clearance fit end brackets as well. The solar panels discussed herein may vary in size, and may have a light receiving surface having an area as large as 2.2 meters×2.6 meters.
The elongated member 200, 300 may comprise a formed steel sheet, such as 16, 18, or 20 gauge cold-rolled steel. Other materials having similar strength and flexibility may be used as well. Additionally, the elongated member 200, 300 may be coated with a suitable coating for corrosion resistance. For instance, elongated member 200, 300 may comprise an aluminum-zinc coating, such as a coating containing 55% aluminum and 45% zinc by weight. The nominal coating thickness may be between about 15 μm and about 30 μm on each side of elongated member 200, 300. In one embodiment, the elongated member 200, 300 is constructed of galvanized steel. Alternatively, the elongated member 200, 300 may be constructed of a plastic or cardboard material if to be used solely as a shipping spacer.
Adhesive members 420 may comprise a structural glazing tape suitable for bonding glass materials to metallic structures. The structural glazing tape may comprise conformable, acrylic closed cell foam having a high performance acrylic adhesive applied to both sides. Examples of structural glazing tapes, which may be used in embodiments of the present invention, include VHB Structural Glazing Tapes manufactured by 3M in St. Paul, Minn.
One embodiment of the present invention may include an adhesion promoter in conjunction with structural glazing tape. Glass materials, such as those used in solar panels, are hydrophilic. This characteristic makes an adhesive bond, particularly with an acrylic adhesive, susceptible to degradation under high humidity or when otherwise exposed to high moisture environments. In order to prevent this problem, the solar panel may be surface treated with an adhesion promoter, such as a silane coupling agent, to reduce the hydrophilic nature of the solar panel 410 and enhance the adhesive bond between the solar panel 410 and the adhesive member 420. One such adhesion promoter that may be used in the present invention is 3-glycidoxypropyl trimethoxysilane resin. An example of this adhesion promoter is Z-6040 Silane manufactured by Dow Corning Corporation in Midland, Mich.
Alternatively, the adhesive member may comprise adhesive glue suitable for bonding glass to metal structures and having the aforementioned characteristics of the structural glazing tape.
In one embodiment, a solar panel may be further retained by one or more end brackets to prevent slippage of the laminated glass members due to slow plastic creeping of the lamination material (e.g., PVB or EVA).
Referring to
The automation system 950 is generally a conveying system that is used to support and transfer the solar panel 810 through the various sections of the support member attachment module 900. In one example, as shown in
In the first step of attaching elongated support members 820 to the solar panel 810 via the support member attachment module 900, the cleaning module 960 is adapted to perform one or more cleaning and preparation processes to the non-light receiving surface of the solar panel 810 so that the elongated support members 820 can be securely and reliably attached in a subsequent step. The cleaning and preparation process may include a cleaning fluid rinse of the non-light receiving surface of the solar panel 810, gas purge of the surface to remove particles, and/or the application of a primer or other material (e.g., glue) to the surface that can be used to help promote or form a bond between the non-light receiving surface of the solar panel 810 and the elongated support members 820. In one embodiment, a cleaning fluid or primer material is delivered from one or more source vessels 961 through a nozzle 962 to the non-light receiving surface of the solar panel 810.
In the next step, the solar panel 810 is transferred to the drying region 970 where the solar panel 810 is dried to remove any contaminants that might affect the bonding process. In one embodiment, the drying region 970 includes a hood 973 and an exhaust device 972 (e.g., fan) that are adapted to dry the surface of the solar panel 810 by promoting evaporation of the cleaning solution components and/or collect vapors emanating from the primer or other chemicals delivered during the cleaning process.
In the next step, the solar panel 810 is transferred to the support member placement region 980 where the elongated support members 820 are placed on the solar panel 810 by use of robotic devices 981. The robotic devices 981 may be conventional robotic devices that are positioned to receive an elongated support member 820 from a receiving area (not shown) and place the elongated support member 820 on a desired region of the solar panel 810. In one embodiment, prior to placement of the elongated support member 820 on the solar panel 810 an amount of a glue or tape material, such as the adhesive member 420, is affixed to a bonding surface of the elongated support member 820 that is placed against the non-light receiving surface of the solar panel 810 by the robotic device 981.
In the next step, the solar panel 810 is transferred through the support member attachment region 990 where the elongated support member 820 is urged against the non-light receiving surface of the solar panel 810, which is supported on the automation system 950, by use of one or more automated rollers 991. In one embodiment, the automated roller 991 is generally weighted to provide a desired load to the elongated support member 820 and the solar panel 810 to assure that the elements used to bond the elongated support member 820 to the solar panel 810 are in contact. In another embodiment, the force applied by the automated roller 991 by an actuator (not shown) and the speed with which the solar panel 810 is fed through the automated rollers 991 by the automation system 950 components is controlled by the system controller 995. Next, solar panel 810 can be transferred to an unload module using one or more of the automation system 950 components.
Referring to
As shown in
In one embodiment, the lower transverse support rail 1012 includes a plurality of mounting tabs 1034, which may have some compliance for supporting each elongated member 820. In one embodiment, a fastener 1036 is used to attach the elongated member 820 to the lower transverse rail 1012 and provide an electrical connection for grounding purposes. The fastener 1036 may be a metallic screw, rivet, or other conductive fastening device. In one embodiment, the lower transverse rail 1012 is electrically attached to the lower support 1010, which is electrically grounded.
Referring to
In one embodiment of the present invention, the upper transverse rail 1014 is a mirror image of the lower transverse rail 1012. As such, the upper transverse rail 1014 may also include a slot region 1022 receiving each elongated member 820 as well. Additionally, the solar panel 810 may also be attached to the upper transverse rail 1014 via the adhesive member 1040 and panel mounting portions 1030. In one embodiment, the upper transverse rail 1014 also includes a mounting tab 1034 for attaching to each elongated member 820 with the fastener 1036.
In one embodiment, the one or more middle transverse rails 1016 are identical to the lower transverse rail 1012 and the upper transverse rail 1014 except the slot region 1022 of the middle transverse rails 1016 extends through both panel mounting portions 1030 and both flexible support portions 1026. As such each solar panel 810 may also be attached to the panel mounting portions 1030 of each middle transverse rail 1016 via the adhesive member 1040. In one embodiment, each middle transverse rail 1016 also includes a mounting tab 1034 for attaching to each elongated member 820 with the fastener 1036.
In one embodiment, the lower transverse rail 1012, the upper transverse rail 1014, and the one or more middle transverse rails 1016 may comprise a formed steel sheet, such as appropriate gauge cold-rolled steel. Other materials having similar strength and flexibility may be used as well. In one embodiment, the rails may be coated for corrosion resistance. In one embodiment, an aluminum/zinc coating, such as a coating containing 55% aluminum and 45% zinc by weight may be used. Nominal coating thickness may be between about 15 μm and about 30 μm. In one embodiment, the lower transverse rail 1012, the upper transverse rail 1014, and the one or more middle transverse rails 1016 comprise galvanized steel.
The cross-sections of the lower transverse rail 1012, the upper transverse rail 1014, and the one or more middle transverse rails 1016 illustrated in
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
This application claims benefit of U.S. provisional patent application Ser. No. 61/028,795, filed Feb. 14, 2008 and U.S. provisional patent application Ser. No. 61/036,691, filed Mar. 14, 2008, each of which is herein incorporated by reference. This application is related to U.S. application Ser. No. 12/202,199, filed Aug. 29, 2008 and U.S. application Ser. No. 12/201,840, filed Aug. 29, 2008.
Number | Date | Country | |
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61028795 | Feb 2008 | US | |
61036691 | Mar 2008 | US |