WO2010040695A1

WO2010040695A1 - Photovoltaic system, photovoltaic module, sub-construction and method for assembling a photovoltaic system

Info

Publication number: WO2010040695A1
Application number: PCT/EP2009/062839
Authority: WO
Inventors: Götz Springer; Annemarie Schuster
Original assignee: Sunfilm Ag
Priority date: 2008-10-06
Filing date: 2009-10-02
Publication date: 2010-04-15
Also published as: DE102008050529A1; TW201027775A

Abstract

The invention relates to a photovoltaic system, to a photovoltaic module, to a sub-construction and to a method for assembling a photovoltaic system. A photovoltaic system (100) comprises a sub-construction (104) for holding a photovoltaic module (102), comprising a back support (110) that is attached to the back side of the photovoltaic module (102) by way of two adhesive surfaces arranged at a distance (114) from one another, said surfaces provided with a connecting piece (116). A mounting rail (108) is disposed on the sub-construction (104), wherein the back support (110) and the mounting rail (108) are adapted to allow the photovoltaic module (102) with the back support (110) to be inserted into the mounting rail (108) in at least partially form-fitted fashion and such that the back support is fixed in the mounting rail (108).

Description

description

Photovoltaic system, photovoltaic module, substructure and method for equipping a photovoltaic system

The invention relates to a photovoltaic system, a photovoltaic module, a substructure and a method for equipping a photovoltaic system.

A photovoltaic module (also referred to as a solar module) usually consists of a plurality of mutually electrically connected solar cells, which convert via the photovoltaic effect a radiation energy contained in sunlight into an electrical energy.

Photovoltaic modules are used for the direct conversion of solar energy into electricity. Thin-film solar modules have photoactive layers with a thickness in the range of a few tens of nanometers to a few micrometers. Usually, the photoactive layers are applied over a large area to a substrate, for example a glass pane, together with contact and optionally reflection layers. With the help of several structuring steps, a plurality of individual strip-shaped solar cells are formed, which are electrically connected in series. The width of the strip-shaped solar cells, also called cell strips, is in the range of centimeters. Current collectors are usually applied to the outer cell strips, via which the thin-film solar module is connected and the generated electrical power can be dissipated.

On the coated substrate is usually another sheet material, for example, another glass sheet, laminated to protect the photoactive layers from damage and weathering. To reinforce the solar module, a peripheral frame (made of aluminum, for example) can be used, in particular if a non-load-bearing or flexible substrate is used. If no frame is provided, for example, when using glass sheets as a substrate and as a cover, it is called a frameless solar module.

A compilation of several photovoltaic modules for power generation is called a photovoltaic system. Usually, the photovoltaic modules are provided with a frame which is mounted on a support by substructure, for example, screwed, is. In a free-range system is doing the

Photovoltaic module mounted on a substructure, which is mounted on an elevation. In a rooftop system usually the photovoltaic module is mounted on a substructure, which is mounted on a support structure on a rooftop. But it is also intended to provide the photovoltaic module with a substructure, which serves as an interface to the house roof.

Regardless of the type of photovoltaic system, photovoltaic modules are generally either framed or provided as unframed modules. When mounting a frameless solar module usually has a mounting system attached to the frameless solar module, via which the solar module is attached in a further step to a support device. For this purpose, mounting brackets are known which comprise the frameless thin-film solar module at its edge. The mounting brackets are designed so that a Shading or a cover of the cell strips is prevented, by which the efficiency of the solar module could be reduced.

This has the disadvantage that the fastening system the

Solar module on its upper side facing the light may not overlap or only in a very narrow area in order to cover the cell strips as little as possible. This can lead to an unfavorable distribution of forces and thus damage to the module when mounted on a

Carrier device or in operation, for example, by weathering during operation of the module. In particular, in the assembly of the photovoltaic system with a large number of photovoltaic modules, for example in so-called open-space solar systems, such a type of installation is also expensive and expensive.

The object of the invention is therefore to provide a simple mounting option for photovoltaic modules, in which a reliable and cost-effective and also easy and fast installation of photovoltaic modules is guaranteed.

In a first aspect, this object is achieved by a photovoltaic system comprising:

a substructure for receiving at least one photovoltaic module,

a photovoltaic module with a back carrier mounted on the back of the photovoltaic module by means of two adhesive surfaces spaced apart from each other and provided with a connector, and

- A suspension rail, which is arranged on the substructure, wherein the rear carrier and the suspension rail are set up such that the photovoltaic module with the return carrier at least partially positively in the suspension rail inserted and the back carrier is fixed in the suspension rail.

According to the invention, the photovoltaic module on the backside, i. the main radiation direction for the conversion of radiant energy into electrical energy opposite side, provided with a back carrier. The back carrier serves as a mechanical reinforcement of the

Photovoltaic module, which is particularly advantageous for large frameless modules, since any occurring stresses on the module edges can be avoided. These voltages can occur during the handling of the photovoltaic module during assembly, for example. For mounting the photovoltaic modules thus only the back carrier is used without having to provide the photovoltaic module with a frame or the like. In addition, no shading by the frame members or module clamps occurs, so that a high efficiency in the conversion of

Radiation energy into electrical energy can be achieved. The rear carrier is inserted into a suspension rail resting on a substructure. The suspension rail is adapted to the shape of the back carrier, so that the back carrier at least partially positively in the

Suspension rail is located. In this case, the suspension rail can be arranged in a vertical direction, so that the insertion of the photovoltaic module is supported by the rear carrier in the suspension rail by gravity.

In a further embodiment, the rear carrier is formed in cross-section as a hat profile, as a V or as a U-profile. According to this embodiment, the rear carrier is formed as a torsionally rigid workpiece, wherein the at least two adhesive surfaces are arranged on the legs of the hat, V or U profile. The adhesive surfaces may be formed both continuously and in several segments along the back carrier, so that they are arranged substantially parallel and at a distance from each other. The connecting piece and the adhesive surfaces can be designed as a one-piece workpiece. For this example, steel or aluminum bar profiles can be used, which allow a simple and cost-effective production of backbones.

In a further embodiment, the adhesive surfaces of the back carrier are connected to the at least one photovoltaic module by means of an adhesive strip or by means of an adhesive layer, preferably a glue layer.

Accordingly, it is possible to have a stable and durable

To provide connection between the back carrier and the photovoltaic module, which is also simple and inexpensive. Furthermore, an electrical insulation between the back carrier and the photovoltaic module can be achieved by the bond, so that a wiring of several photovoltaic modules is made possible.

In a further embodiment, a separating layer is additionally provided between the rear carrier and the substructure, so that the rear carrier and the substructure are galvanically separated. By using a release liner, electrical isolation can be achieved to reduce contact corrosion that could occur through the use of different metals or metal compounds for the backing and the individual elements of the substructure. In a further embodiment, the material of the back carrier is selected such that its thermal expansion coefficient corresponds to that of the at least one photovoltaic module within predetermined limits. Accordingly, possibly occurring mechanical

Tensions due to temperature changes reduced or eliminated altogether, so that the life of the photovoltaic system is extended.

In a further embodiment, the rear carrier and the suspension rail are fixed by means of a clamping connection which has a pair of retaining elements on the rear carrier and the suspension rail.

According to this embodiment, the orientation of the

Photovoltaic modules on the substructure and their fixation on the substructure achieved in a single step, so that a reliable and cost-effective and also easy and fast installation of photovoltaic modules is guaranteed.

In a further embodiment, the holding elements are arranged on respectively opposite side surfaces on the rear carrier and the suspension rail, wherein the first holding element is arranged on the suspension rail and the second holding element is arranged on the rear carrier, such that the first holding element and the second holding element intermeshable are executed. According to this embodiment, it is possible to achieve the alignment of the photovoltaic modules on the substructure and their fixation on the substructure without screwing. Consequently, a reliable and cost-effective and also easy and fast installation of photovoltaic modules is ensured.

In a further embodiment, the first retaining element of the suspension rail has protruding elements.

Photovoltaic modules are aligned on the substructure by insertion into the suspension rail. The fixation is achieved on the substructure by the protruding elements, which form part of the holding elements. Accordingly, a mounting option is provided which prevents slippage of the photovoltaic modules, since after depositing the photovoltaic module is held by the protruding elements.

In a further embodiment, the second holding element of the rear carrier is designed as openings, in which engage the protruding elements of the first holding element of the suspension rail.

According to this embodiment, it is possible to

To fix photovoltaic modules on the suspension rail by the protruding elements of the first support member of the suspension rail engage in the openings, which ensures a reliable and cost-effective and also easy and fast installation of photovoltaic modules. In a further embodiment, the first holding element is arranged at a first end of the suspension rail.

So it is possible to mount the photovoltaic modules at a first end of the suspension rail to the

Photovoltaic system with a variety of photovoltaic modules to equip.

In a further embodiment, further holding elements are provided, which preferably comprise screw connections.

Other holding elements can serve as an additional backup, and are mounted after the photovoltaic modules are already fixed in the suspension rail, which ensures a reliable and cost-effective and also easy and fast installation of photovoltaic modules.

In a further embodiment, the further holding elements at the first ends opposite ends of the suspension rail and the back carrier are arranged.

The attachment of the further holding elements at opposite ends increases the stability of the photovoltaic modules. The additional fixation can be done in a separate operation, after which the photovoltaic modules are already fixed in the suspension rail.

In a further embodiment, the photovoltaic system comprises at least a first purlin and a second purlin, which are connected to the substructure and on which the suspension rail is attached. In this embodiment, the suspension rail is designed to be longer, both to bridge the distance between the two purlins as well as the back carrier as far as necessary to take static. In addition, a fixation of the back carrier can be done on the suspension rail by means of screws or clamps.

In a further embodiment, the first purlin is arranged as a middle purlin, which is arranged between two further purlins.

In this embodiment, the suspension rail is executed only as a short connector, which allows the hanging of the lower and the setting of the upper module. The fixation of the modules is then additionally directly on the lower or upper purlin.

In a further embodiment, the suspension rail covers two or more photovoltaic modules.

According to this embodiment, more than one

Photovoltaic modules are combined by means of a suspension rail to a larger module, which on the

Substructure can be applied.

In a further embodiment, the suspension rail is arranged in a vertical direction.

Accordingly, the photovoltaic modules are arranged in the direction of gravity on the suspension rail, so that the photovoltaic system rests during assembly without additional securing the modules in the fixation, so that a reliable and cost-effective and also simple and fast installation of photovoltaic modules is guaranteed.

In a further embodiment, the suspension rail is arranged in a horizontal direction.

This embodiment allows, for example, the mounting of the photovoltaic modules from the side.

In a further aspect, this object is achieved by a

Solved photovoltaic module having a rear carrier, which is insertable into a suspension rail, wherein the rear carrier is mounted on the back of the photovoltaic module and at least two adhesive surfaces, which are arranged at a distance from each other and are provided with a connecting piece, which can be inserted into the suspension rail is.

According to the invention, the photovoltaic module on the back, ie the main radiation direction for the conversion of radiant energy into electrical energy opposite side, provided with a back carrier. The back carrier serves as a mechanical reinforcement of the photovoltaic module, which is particularly advantageous for large frameless modules, since any occurring stresses on the module edges can be avoided. For mounting the photovoltaic modules thus only the back carrier is used without having to provide the photovoltaic module with a frame or the like. In addition, there is no shading by the mounting system, so that a high efficiency in the conversion of radiant energy into electrical energy can be achieved. In a further embodiment, the photovoltaic module is designed as a frameless thin-film photovoltaic module.

Thin-film photovoltaic modules represent a balanced and thus cost-effective variant of a solar module in terms of their efficiency in the conversion of radiant energy into electrical energy and the production costs.

In a further aspect, this object is achieved by a

Substructure solved for a photovoltaic system for receiving one or more photovoltaic modules, wherein the substructure has a suspension rail, which is arranged on the substructure and is arranged such that a photovoltaic module with a back carrier in the suspension rail can be introduced.

According to the invention, the photovoltaic module on the backside, i. the main radiation direction for the conversion of radiant energy into electrical energy opposite side, provided with a back carrier. The rear carrier is inserted into a suspension rail resting on a substructure. The suspension rail is adapted to the shape of the back carrier, so that the back carrier is at least partially positive fit in the suspension rail. In this case, the suspension rail is arranged in a vertical direction, so that the insertion of the photovoltaic module is supported with the back carrier in the suspension rail by gravity.

In a further aspect, this object is achieved by a method for equipping a photovoltaic system, comprising: - Providing a substructure for receiving one or more photovoltaic modules, which has a suspension rail, which is arranged on the substructure;

- Providing one or more photovoltaic modules, each having a back carrier, wherein the back carrier is mounted on the back of the photovoltaic module by means of two adhesive surfaces, which are arranged at a distance from each other and are provided with a connecting piece;

- Introducing the photovoltaic module with the back carrier in the suspension rail.

Accordingly, a simple installation of the photovoltaic modules by hooking or -stellen, wherein at the same time a slip-off can be provided. An additional fixation can be done in a separate operation. The

Alignment of the modules is determined by mounting the suspension rails. A complete pre-assembly of the substructure is possible. The photovoltaic modules must only be hung or adjusted in the last operation and possibly additionally fixed. By a suitable choice of the materials used or use of additional separating layers, a galvanic separation of the photovoltaic modules from the substructure and contact corrosion can be avoided. It is both a double-row construction as well as a three-row constructions possible, which can be extended.

In a further embodiment, a teaching is used for mounting the suspension rail.

To facilitate the simplest possible installation of the photovoltaic modules, the use of a gauge is provided for mounting the suspension rails, the orientation of the Mounting rail and the distance between the suspension rails determines to allow a precise installation of photovoltaic modules.

The invention will be explained in more detail using exemplary embodiments with reference to the drawings. Further advantages, advantageous embodiments and developments of the invention will become apparent from the embodiments described below in conjunction with FIGS. 1 to 8. In this case, functionally equivalent elements, regions and structures are provided with the same reference numerals. Insofar as elements, regions or structures correspond in their function, their description is not repeated for each of the exemplary embodiments.

In the drawings show:

Figure IA is a schematic perspective view of a photovoltaic system according to an embodiment of

Invention,

Figure IB is a schematic representation of a

Photovoltaic module according to an embodiment of the invention in a plan view,

Figure 2 is a schematic cross-sectional view of a

Photovoltaic module according to an embodiment of the

Invention,

Figure 3 is a schematic perspective view of a

Photovoltaic module according to an embodiment of the

Invention, Figure 4 is a schematic cross-sectional view of a

Photovoltaic system according to an embodiment of the invention,

Figure 5 is a schematic cross-sectional view of a

Photovoltaic system according to an embodiment of the invention,

FIGS. 6A to 6G schematically show the mounting of photovoltaic modules of a photovoltaic system in FIG

Cross-sectional views according to an embodiment of the invention,

FIGS. 7A to 7G schematically show the mounting of photovoltaic modules of a photovoltaic system in FIG

Cross-sectional views according to an embodiment of the invention, and

FIG. 8 shows a flow chart for a method for assembling photovoltaic modules according to an embodiment of the invention.

FIG. 1A shows a schematic side view of a photovoltaic system 100 in a perspective side view. The photovoltaic system 100 has a plurality of photovoltaic modules 102, the photovoltaic modules 102 being shown in FIG. 1A from their photosensitive side. In order to be able to better represent elements which are arranged on the side facing away from the photosensitive side of a substructure 104, two photovoltaic modules 102 are shown in dashed lines only in their outlines. In the exemplary embodiment according to FIG. 1A, the photovoltaic modules 102 can be designed, for example, as frameless thin-film solar modules. The frameless thin-film solar modules can be embodied, for example, as tandem solar cells, in which an polycrystalline or microcrystalline PIN diode is arranged under an amorphous PIN diode as the active layer, so that overall a higher efficiency in the conversion of incoming radiation energy into electrical energy results.

The embodiment of a photovoltaic system 100 is particularly suitable but not exclusively in connection with frameless thin-film solar modules as photovoltaic modules 102. Of course, the photovoltaic modules 102 in this as well as in all subsequent embodiments as well as (poly) crystalline solar modules.

As further shown in FIG. 1A, the photovoltaic system includes an elevation 106 connected to the substructure 104. The elevation 106 is connected, for example by means of suitable fasteners in a soil to form a free surface solar system. But it is also possible to install the substructure on a building roof or a flat roof. Furthermore, in FIG. 1A, suspension rails 108 are shown, which are connected to the substructure 104. For each photovoltaic module 102, two suspension rails 108 are provided by way of example, which are arranged parallel to one another on the substructure 104 in a vertical direction. However, it is also conceivable to provide a different number of suspension rails 108 for a photovoltaic module 102, for example only one suspension rail 108 or more than two suspension rails 108. As is apparent from the following Exemplary embodiments, the suspension rail 108 serves to receive the photovoltaic module 102. For this purpose, a back carrier 110 is attached to the back of the photovoltaic module 102. The photovoltaic module 102 with the rear carrier 110 is fixed in the suspension rail 108.

The photovoltaic system 100 shown in Figure IA is merely illustrative of the structure of the device according to the invention. It goes without saying

It goes without saying that a different number of photovoltaic modules 102 in different sizes and arrangements can be used. Thus, the invention is not limited to two-row arrangements of photovoltaic modules 102, but can be arbitrarily extended to three- or multi-row arrangements. The photovoltaic modules 102 may have any sizes. For example, it is provided that the photovoltaic modules 102 have a size of 5 m.sup.2 or more.

For each photovoltaic module 102, two return carriers 108 are provided by way of example, which are arranged parallel to one another on the substructure 104 in a vertical direction. However, it is also conceivable to arrange the rear carriers 108 in a horizontal direction, as in FIG. 1B

(left) is shown. Furthermore, it is also possible to provide a different number of back beams 108 for a photovoltaic module 102, for example only one back beam 108 or more than two back beams 108. Another possibility is to use one or more back beams 108 for two or more photovoltaic modules, for example, by arranging four photovoltaic modules 102 in two in parallel Rear supports 108 are arranged, as shown in Figure IB (left).

With reference to FIG. 2, the mounting of the photovoltaic module 102 with the rear carrier 110 in the following will be described hereinafter

Suspension rail 108 described in more detail. FIG. 2 is a cross-sectional view through a photovoltaic module drawn on the section line A-B, as shown in FIG. 1A.

As shown in FIG. 2, the rear carrier 110 comprises two adhesive surfaces 112, which are arranged parallel to one another and at a distance 114. Together with a connecting piece 116, which connects the two adhesive surfaces 112 with each other, a one-piece workpiece is formed, which constitutes the back carrier 110. As shown in Figure 2, the back support 110 may be formed in cross-section as a hat profile. But it is also possible to use other profile shapes, such as V or U profiles. The rear carrier 110 serves the mechanical

Stabilization of the Photovoltaic Module 102. According to one embodiment, the adhesive surfaces 112 of the back carrier 110 are connected to the photovoltaic module 102 by means of an adhesive strip or by means of an adhesive layer. On the other hand, the adhesive layer can also cause electrical insulation in order to electrically isolate the photovoltaic module 102 from the back support 110. In another embodiment, it is possible between the back support 110 and the suspension rail 108 or the substructure 104, a release layer of electrically non-conductive material to provide galvanic isolation to reduce contact corrosion.

As further shown in FIG. 2, the rear carrier 110 can be introduced into the suspension rail 108. For this purpose, the rear carrier 110 has a shape which is adapted to that of the suspension rail 108 on the side facing away from the photovoltaic module 102. The back carrier 110 may also be configured such that its coefficient of thermal expansion corresponds to that of the photovoltaic module 102 within predetermined limits in order to reduce mechanical stresses due to temperature changes.

With reference to FIG. 3, the fixing of the return carrier in the suspension rail will be described in more detail below. FIG. 3 shows a perspective side view of the rear support 110 and the suspension rail 108. According to this embodiment, the fixing of the rear carrier 110 and the suspension rail 108 takes place by means of a clamping connection 120. For this purpose, the suspension rail 108 and the rear carrier

110 each holding elements that can interlock. As shown in Figure 3, the holding members 124 of the suspension rail 108 are designed as protruding elements. These may for example have a hook shape, as shown in Figure 3.

The corresponding holding element 122 of the back carrier 110 is formed as an opening. For this purpose, for example, a slot-shaped opening in the back carrier 110 can be punched or milled. The first holding element 124 of the

The suspension rail 108 and the second retaining element 122 of the back support 110 engage with each other, so that the back support 110 with the photovoltaic module 102 thereon is secure can be attached. In FIG. 3, only a pair of holding elements 122 and 124 is shown for this purpose. However, it is also envisaged that further holding elements are arranged on the rear carrier 110 or the suspension rail 108, for example on the opposite side surfaces with respect to the first clamping connection 120.

With reference to FIG. 4, the assembly of the photovoltaic module 102 with the rear carrier 110 on the substructure 104 will be described in more detail below. The illustration in Figure 4 follows a cross-sectional view along the line C-D, as shown in Figure 1.

The suspension rail 108 is on the substructure 104 in a vertical direction, that is in the direction of

Arranged gravitational field. The protruding elements 124 on the suspension rail 108 are arranged directed upward, so that the photovoltaic module 102 is fixed with its back support 110 due to gravity in the support members 124. The photovoltaic modules 102 are thus mounted on the suspension rail 108, without having to make a screw connection.

However, it is also conceivable, the photovoltaic modules 102 and the return carrier 110 by additional

Secure screw after the preparation of the clamping connection by means of the holding elements 124.

The suspension rail 108 is arranged on the substructure 104, which has two purlins, which run in the horizontal direction. The lower purlin 128 and the upper purlin 130 may be made of, for example, a steel or aluminum bar profile. The suspension rail 108 completely covers the area between the upper purlin 130 and the lower purlin 128. The structure comprising the suspension rail 108, the two purlins 128 and 130 and the substructure 104 can be constructed, for example, by means of screw connections.

Referring now to Figure 5, another embodiment of a photovoltaic system 100 is shown. The embodiment according to FIG. 5 differs from that according to FIG. 4 in that the substructure 104 has a middle purlin 132 in addition to the upper purlin 130 and the lower purlin 128.

The suspension rail 108 is arranged in the embodiment of Figure 5 in an area above the middle purlin 132, without completely covering the area between the lower purlin 128 and the upper purlin 130. The protruding elements 124 of the suspension rail 108, in turn, engage with the back beams 110 of the photovoltaic modules 102. As an additional safeguard, further fixings 140 are formed on the upper purlin 130 and on the lower purlin 180, which can be designed both as protruding elements and as screw connections.

The embodiments described in FIGS. 4 and 5 show double-row arrangements of photovoltaic modules 102 for a free-space solar system. However, it goes without saying that the embodiments shown are to be understood as examples only. It is thus possible to extend the concept shown in FIGS. 4 and 5 to three-row or multi-row photovoltaic systems. Furthermore, it is also possible, for example, the elevation 106 replaced by a stand for a roof mounting.

The module assembly of a photovoltaic system according to FIG. 4 will be described in more detail below with reference to FIGS. 6A to 6G.

Starting point of the assembly of photovoltaic modules is a substructure 104 which is mounted on the elevation 106. The substructure 104 has at its lower end a lower purlin 128 and at its upper end an upper purlin 130, as shown in Figure 6A. The elevation 106, the substructure 104 and the two purlins 128 and 130 can be constructed, for example, by means of screw connections.

As shown in FIG. 6B, mounting of the suspension rail 108 is subsequently carried out. It is fastened in a vertical direction on the upper purlin 130 and on the lower purlin 128. Advantageously, for example, an empty can be used for mounting the suspension rail 108. As a result, it is possible to dispose a plurality of hanging rails 108 on the substructure 104 in a substantially parallel orientation and in a predetermined pitch matched to the size of photovoltaic modules.

As shown in FIG. 6C, after mounting the suspension rail 108, the suspension of the lower photovoltaic module 102 takes place. The lower photovoltaic module 102 is thereby introduced by means of its back support 110 into the protruding elements 124 of the suspension rail 108. As shown in Figure 6D, the lower

Photovoltaic module 102 are merely hung so that no screws are required for its attachment.

In the next step, which is shown in FIG. 6E, the upper photovoltaic module 102 is hooked into the protruding elements 124 of the suspension rail 108 by means of its rear carrier 110.

As a result, a photovoltaic system 110 is obtained, in which the two photovoltaic modules 102 are suspended in the suspension rail 108. This process is repeated for a plurality of photovoltaic modules 102, which are mounted side by side on their respective suspension rails 108.

As shown in FIG. 6G, a fixation of the photovoltaic modules 102 on the suspension rail 108 can now optionally be carried out. The fixation may include, for example, a screw connection to hold the photovoltaic modules 102 permanently in the suspension rail 108.

The assembly of a photovoltaic system according to FIG. 5 is explained in more detail below with reference to FIGS. 7A to 7D.

The starting point of the method according to the invention is a substructure 104 which comprises a lower purlin 128, a middle purlin 132 and an upper purlin 130. The substructure also has an elevation 106, as shown in Figure 7A.

In the next step, which is shown in FIG. 7B, the mounting rail 108 is now mounted. The suspension rail 108 is fastened in an area above the middle purlin 132. The suspension rail 108 has, in the area between the middle purlin 132 and the lower purlin 128, the first holding element in the form of projecting elements 124. In the area between the middle purlin 132 and the upper purlin 130, a first holding element in the form of protruding elements 124 is likewise arranged.

As shown in Figure 7C, the lower photovoltaic module 102 is now suspended in the protruding elements 124 in the region between the middle purlin and the lower purlin.

The fully suspended module is shown in Figure 7D.

In the next step, which is shown in FIG. 7E, the upper photovoltaic module 102 is now set in the suspension rail 108.

As shown in FIG. 7F, the upper photovoltaic module 102 is again held in position by means of the protruding elements 124 which engage in its back carrier 110.

Finally, as shown in FIG. 7G, a fixing of the two photovoltaic modules 102 takes place on the lower purlin 128 and on the upper purlin 130.

The proposed mounting option of the photovoltaic system 100, which was explained with reference to FIGS. 6A to 6G and 7A to 7G, makes use of a suspension rail 108 into which the rear carrier 110 of the photovoltaic module 102 is suspended. For this purpose, the shape of the suspension rail 108 is adapted to that of the back carrier 110. The suspension rail 108 is equipped with special protruding elements 124 which hook when mounting or setting of the photovoltaic module 102 in correspondingly shaped openings in the back carrier 110 and so in a single step, the alignment and support the

Photovoltaic modules ensured on the substructure.

In the following, with reference to FIG. 8, method steps for equipping a photovoltaic system are summarized on the basis of a flowchart.

In step 810, there is provided a substructure 104 for receiving one or more photovoltaic modules 102 having a retainer rail 108 disposed on the substructure 104 in a vertical direction.

In step 820, provision is made of one or more photovoltaic modules 102, each having a backbone 110, the backbone 110 being mounted on the back side of the photovoltaic module 102 and including at least two adhesive surfaces 112 disposed substantially parallel and spaced apart 114 are and are provided with a connecting piece 116.

In step 830, the introduction of the photovoltaic module 102 with the rear carrier 110 in the suspension rail 108. In summary, a simple and cost-effective installation option for large-scale photovoltaic modules, which can form, for example, a free-space solar system.

The invention is not limited by the description with reference to the embodiments. Rather, the includes Invention, each novel feature and any combination of features, which includes in particular any combination of features in the claims, even if this feature or this combination is not even explicitly stated in the claims or exemplary embodiments.

Claims

Claims:

A photovoltaic system comprising:

a substructure (104) for receiving at least one photovoltaic module (102),

- A photovoltaic module (102) having a rear support (110) which is mounted on the back of the photovoltaic module (102) by means of at least two adhesive surfaces (112) which are arranged at a distance (114) to each other and provided with a connecting piece (116) are and

a suspension rail (108) arranged on the substructure (104), wherein the rear support (110) and the

Einhängeschiene (108) are arranged such that the photovoltaic module (102) with the rear support (110) at least partially positively in the suspension rail (108) can be introduced and the back carrier is fixed in the suspension rail (108).

2. Photovoltaic system according to claim 1, wherein the rear carrier (110) is formed in cross section as a hat profile, as a V or as a U-profile.

3. Photovoltaic system according to one of claims 1 or 2, wherein the adhesive surfaces (112) of the back carrier (110) with the at least one photovoltaic module (102) by means of a

Adhesive strip or by means of an adhesive layer, preferably a glue layer, are connected.

4. Photovoltaic system according to one of claims 1 to 3, in which between the rear support (110) and the

Substructure is provided a separating layer (118), so that the at least one photovoltaic module (102) and the substructure are galvanically isolated.

5. Photovoltaic system according to one of claims 1 to 4, wherein the material of the back carrier (110) is selected so that its thermal expansion coefficient corresponds to that of the at least one photovoltaic module (102) within predetermined limits.

A photovoltaic system according to any one of claims 1 to 5, wherein the rear support (110) and the suspension rail (108) are fixed by a clamp connection (120) having a pair of support members (122; 124) on the rear support and the suspension rail ,

7. Photovoltaic system according to claim 6, wherein the holding elements are arranged on respectively opposite side surfaces on the rear carrier (110) and the suspension rail, wherein the first holding element (124) is arranged on the suspension rail and the second holding element (122) on the rear carrier ( 110) is arranged, such that the first holding element and the second holding element are designed to engage one another.

8. Photovoltaic system according to claim 7, wherein the first holding element (124) of the suspension rail has protruding elements.

9. Photovoltaic system according to claim 8, wherein the second holding element of the back carrier (110) is formed as openings, in which engage the projecting elements of the first holding element of the suspension rail (108).

10. Photovoltaic system according to claim 7 to 9, wherein the first holding element at a first end of the suspension rail

(108) is arranged.

11. Photovoltaic system according to one of claims 1 to 10, wherein further further holding elements are provided, which preferably comprise screw connections.

12. Photovoltaic system according to claim 11, wherein the further holding elements at opposite ends of the first ends of the suspension rail (108) and the rear support (110) are arranged.

13. Photovoltaic system according to one of claims 1 to 12, further comprising at least a first purlin, which is connected to the substructure and on which the suspension rail (108) is attached.

14. Photovoltaic system according to claim 13, wherein the first purlin is set up as a middle purlin, which is arranged between two further purlins.

15. Photovoltaic system according to one of claims 1 to 14, wherein the suspension rail (108) two or more

Photovoltaic modules (102) covers.

16. Photovoltaic system according to one of claims 1 to 15, wherein the suspension rail (108) is arranged in a vertical direction.

17. Photovoltaic system according to one of claims 1 to 15, wherein the suspension rail (108) is arranged in a horizontal direction.

18. Photovoltaic module, which has a rear carrier (110) which can be introduced into a suspension rail (108), wherein the rear carrier (110) on the back of the photovoltaic module (102) is mounted and at least two adhesive surfaces (112) which are arranged at a distance from each other and with a connecting piece (116) which is insertable into the Einhängeschiene (108).

19. Photovoltaic module according to claim 18, wherein the rear carrier (110) is formed in cross-section as a hat profile, as a V or as a U-profile.

20. Photovoltaic module according to claim 18 or 19, which is designed as a thin-film photovoltaic module.

21. Photovoltaic module according to one of claims 18 to 20, wherein the adhesive surfaces of the back carrier (110) by means of an adhesive strip or by means of a glue layer are attached.

22. Photovoltaic module according to one of claims 18 to 21, wherein the material of the back carrier (110) is selected so that its thermal expansion coefficient corresponds to that of the photovoltaic module (102) within predetermined limits.

23. Substructure for a photovoltaic system for receiving one or more photovoltaic modules according to one of claims 18 to 22, wherein the substructure is a

Mounted rail (108) which is arranged on the substructure and is arranged such that a photovoltaic module with a return carrier (110) in the suspension rail (108) can be introduced.

24. Method for equipping a photovoltaic system comprising: - Providing a substructure for receiving one or more photovoltaic modules (102) having a Einhängeschiene (108) which is arranged in a vertical direction on the substructure; - Providing the one or more photovoltaic modules, each having a back carrier (110), wherein the back carrier (110) is mounted on the back of the photovoltaic module (102) by means of two adhesive surfaces, which are arranged at a distance from each other and are provided with a connecting piece ;

- Introducing the photovoltaic module (102) with the return carrier (110) in the suspension rail (108).

25. The method of claim 24, wherein for mounting the suspension rail (108) a doctrine is used.