Patent Publication Number: US-2012031473-A1

Title: Photovoltaic System and Wind Deflector Structure

Description:
CLAIM OF FOREIGN PRIORITY  
     The present application claims priority to Chinese Patent Application No. 201010252038.X, filed Aug. 3, 2010, which is hereby incorporated by reference in its entirety. 
     FIELD OF THE INVENTION  
     The present invention relates to solar photovoltaic application, and particularly to a wind deflector structure for a photovoltaic system and a photovoltaic system having a wind deflector structure. 
     BACKGROUND OF THE INVENTION 
     Today, energy shortage is a widespread problem all over the world. As a result, a number of new, sustainable energy sources have gained much attention. People are paying more and more attention to the use of solar energy. Compared to other energy sources, solar cells as an energy device have many advantages in terms of cleanliness and environmental protection. Consequently, solar cells are more and more widely applied. Solar photovoltaic power generation is very important to alleviate the current energy crisis and to improve the ecological environment. The solar cell is made from a material which is able to generate a photovoltaic effect, such as silicon, gallium arsenide, copper indium selenium or other materials so as to convert sunlight into electricity by the photovoltaic effect. Currently, a photovoltaic module made up of a plurality of solar cells has been put into use widely, for example, the photovoltaic modules are applied to construct a power generation system, or are used as a building wall or mounted on rooftop of buildings. 
     US Patent Application Publication Nos. 2009/0320905A1, 2009/0320906A1 and 2009/0320907A1 which are correlative to each other and assigned to the same corporation, SunPower Corp., disclose a photovoltaic module adapted to be mounted onto rooftop of buildings. The photovoltaic module comprises a photovoltaic laminate and a frame wherein the photovoltaic laminate is encased. The frame includes opposite leading and trailing frame members and opposite first and second frame members. These four frame members are separately formed, respectively, and they are assembled together by a set of connectors so as to form a frame encompassing the perimeter of the photovoltaic laminate. 
     In addition, a first arm, a second arm, a third arm and a fourth arm are formed in the frame. The first and third arms are respectively formed at opposite ends of the first side frame member, and the second and fourth arms are respectively formed at opposite ends of the second side frame member. The first and second arms extend outwardly beyond the leading frame member, and the third and fourth arms extend outwardly beyond the trailing frame member. The first and second arms are identical in configuration, and the third and fourth arms are identical in configuration. These four arms can make the photovoltaic module effectuate a tilted orientation relative to a substantially flat surface. Mounting regions are respectively formed on the four arms. A lateral space between the first and second arms is less than the one between the third and fourth arms. When adjacent two photovoltaic modules are required to be connected with each other in a front-to-back direction, the first and second arms of the first photovoltaic module are disposed between the third and fourth arms of the second photovoltaic module, and the mounting regions formed on the first and third arms are respectively aligned with the mounting regions formed on the second and fourth arms. Then by means of cooperation between male connectors and female connectors, the adjacent two photovoltaic modules are thus assembled end to end with each other. Furthermore, when adjacent two photovoltaic modules are required to be connected side by side with each other in a left-to-right direction, the first and second photovoltaic modules are aligned with each other, in detail, the second arm of the first photovoltaic module and the first arm of the second photovoltaic module, as well as the fourth arm of the first photovoltaic module and the third arm of the second photovoltaic module, are respectively aligned, and then, similarly by means of cooperation between male connectors and female connectors, the adjacent two photovoltaic modules are thus assembled side by side with each other. However, such a photovoltaic module has a relative more complex connecting manner. Moreover, regardless of a front-to-back arrangement or a side-by-side arrangement, such a photovoltaic module needs additional male and female connectors to complete the connection of the photovoltaic modules. Such a connecting manner would increase the number of parts, thereby increasing costs and complicating assembling procedure; this is contrary to the improvement of working efficiency. Furthermore, this will make it more difficult to repair the photovoltaic system too. 
     Moreover, the photovoltaic module employing the above-mentioned frame will result in an increase of the manufacturing cost and of the weight of the whole photovoltaic module, which will restrict the application of the photovoltaic module on building rooftops having a limited bearing load, thereby hindering the large-scale extended applications of the photovoltaic module. 
     Therefore, it is necessary to provide an improved photovoltaic system to fix the above technical problem in the prior art, so as to reduce cost of the photovoltaic system and to make it easier to install and repair. 
     SUMMARY OF THE INVENTION 
     The main objectives of the present invention are to provide a wind deflector structure for a photovoltaic module and a photovoltaic system having the same, which are simple in structure and easier to install and repair. 
     To achieve the above objectives, an aspect of the present invention is to provide a photovoltaic system comprising a photovoltaic module and a wind deflector structure. The photovoltaic module comprises a photovoltaic cell laminate and a support having a support face for supporting the photovoltaic cell laminate. When the photovoltaic module is mounted onto an installation surface, a front side of the photovoltaic cell laminate is close to the installation surface and a back side thereof is far from the installation surface. The wind deflector structure is mounted close to the back side of the photovoltaic cell laminate and substantially shields a space between the back side of the photovoltaic module and the installation surface. The wind deflector structure is fixed onto the supports of at least two photovoltaic modules side by side in a left-to-right direction so as to restrict a relative position of the at least two photovoltaic modules. 
     Another aspect of the present invention is to provide a wind deflector structure for a photovoltaic system for connecting photovoltaic modules. The photovoltaic module comprises a photovoltaic cell laminate and a support having a support face for supporting the photovoltaic cell laminate. When the photovoltaic module is mounted onto an installation surface, a front side of the photovoltaic cell laminate is close to the installation surface and a back side thereof is far from the installation surface. The wind deflector structure is mounted close to the back side of the photovoltaic cell laminate and substantially shields a space between the back side of the photovoltaic module and the installation surface. The wind deflector structure is fixed onto the supports of at least two photovoltaic modules side by side in a left-to-right direction so as to restrict a relative position of the at least two adjacent photovoltaic modules. 
     By cleverly using the wind deflector structure and by means of cooperation and lock between the wind deflector structure and the support of at least two adjacent photovoltaic module side by side in a left-to-right direction, the present invention can achieve the side-by-side connection of the at least two photovoltaic modules in a left-to-right direction without an additional connector structure. Moreover, during the actual assembling process of a photovoltaic system, it usually requires the installation of a wind deflector structure. The wind deflector structure according to the present invention has dual functions, that is, on the one hand, a wind deflector structure may perform general functions as a wind deflector in preventing an array of the photovoltaic system from the impacts of the wind and keep stability for the array of photovoltaic system on the installation surface so that there is no need for installing an additional wind deflector on the location of the photovoltaic module; on the other hand, it functions as a connector structure for side by side connection of adjacent photovoltaic modules so that additional connectors may be omitted upon the side-by-side connection, thereby saving on the number of parts and cut down costs for the photovoltaic system. Furthermore, the side-by-side connection of the present invention has advantages such as being simple and easy to operate, whereby the assembly procedure of the photovoltaic system is simplified to a great extent and the working efficiency is improved. 
     Other aspects and features of the present invention will become more evident by referring to detailed descriptions of accompanying drawings hereinafter. But it should be made clear that the accompanying drawings are provided for the purpose of explanation, rather than limiting the scope of the invention, as the scope of the invention should be limited in the attached claims. It should also be made clear that unless it is clearly stated, the drawings are not drawn to scale; they are only intended to conceptually illustrate the structures and processes described herein. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an exploded, perspective view of a portion of a photovoltaic system in accordance with an embodiment of the present invention; 
         FIG. 2  is a perspective view of a photovoltaic module of  FIG. 1 ; 
         FIG. 3  is a side view of the photovoltaic module of  FIG. 2 ; 
         FIG. 4  is a cross-sectional view of  FIG. 2  taken along line A-A; 
         FIG. 5  is a perspective view of a support of  FIG. 2 ; 
         FIG. 6  is a perspective view of the support similar to  FIG. 5 , but illustrating another angle of view; 
         FIG. 7  and  FIG. 8  are respectively enlarged schematic views of a portion of a photovoltaic module in accordance with an embodiment of the present invention before and after assembly in a front-to-back arrangement; 
         FIG. 9  is a schematic view of a photovoltaic module provided with ballasts in accordance with the present invention; 
         FIG. 10  is a perspective view of the ballast of  FIG. 9  from another angle of view; 
         FIG. 11  is a perspective view of a middle wind deflector of  FIG. 1  from another angle of view; 
         FIG. 12  is a perspective view of an exterior wind deflector of  FIG. 1  from another angle of view; 
         FIG. 13  is a top view of two of photovoltaic modules in stack in accordance with the present invention; 
         FIG. 14  is a side view of the photovoltaic modules in stack of  FIG. 13 ; 
         FIG. 15  is a cross-sectional view of  FIG. 13  taken along line B-B; 
         FIG. 16  and  FIG. 17  are respectively enlarged views of local regions D and E of  FIG. 15 ; and 
         FIG. 18  is a cross-sectional view of  FIG. 13  taken along line C-C. 
     
    
    
     DETAILED DESCRIPTION OF THE DRAWINGS  
     Hereinafter, detailed descriptions will be given to the embodiments of the present invention in combination with the attached drawings in order to make the above objectives, features and advantages of the present invention more evident. 
     With reference to  FIG. 1 , a photovoltaic system  100  in accordance with an embodiment of the present invention is adapted to be mounted onto an installation surface (not shown) of a building, such as a surface of rooftop, and comprises a plurality of photovoltaic modules  200 , and middle wind deflectors  3 , exterior wind deflectors  4  and lower wind deflectors  5  which are mounted onto the photovoltaic modules  200 . The middle wind deflector  3  and the exterior wind deflector  4  constitute a wind deflector structure for a photovoltaic system in accordance with the present invention. Since the wind deflector structure for photovoltaic system composed of the middle wind deflector  3  and the exterior wind deflectors  4  is mounted to a back side of the photovoltaic module  200 , the wind deflector structure for photovoltaic system in accordance with the present invention is also referred to as a back wind deflector. The plurality of photovoltaic modules  200  form an array arranged in rows and columns. In a specific embodiment, the four photovoltaic modules  200  arranged in two rows and in two columns, i.e., a first photovoltaic module  200   a , a second photovoltaic module  200   b , a third photovoltaic module  200   c  and a fourth photovoltaic module  200   d  are taken as an example for schematic illustration, but they are not intended to limit the present invention. Actually, depending on a size of the installation surface of the building, the photovoltaic system  100  according to the present invention can select a plurality of photovoltaic modules  200  arranged in any arrayed form. 
     Referring to  FIG. 2 , the photovoltaic module  200  comprises a photovoltaic cell laminate  1  and a support  2  mounted onto the photovoltaic cell laminate  1 . The support  2  is adapted to be mounted onto the installation surface of the building, and is mounted to a back surface of the photovoltaic cell laminate  1 . Preferably, the photovoltaic module  200  comprises at least two supports  2 . The supports  2  are in a longitudinal shape extending in a front-to-back direction, and are spaced in a left-to-right direction arranged side by side in the back surface of the photovoltaic cell laminate  1 . In a specific embodiment, a pair of supports  2  is disposed separately in the back surface of the photovoltaic cell laminate  1 . 
     The photovoltaic cell laminate  1  of the present invention is formed by laminating, and encapsulating a front glass substrate, sealant, a plurality of solar cells and a back panel and then by edge sealing. The edge sealing is achieved by means of sealant and/or mounting a sealing frame in a perimeter thereof. The back panel of the photovoltaic cell laminate may also be a glass substrate. Since the frame of the photovoltaic cell laminate of the present invention is only for sealing, in comparison to a traditional photovoltaic module, the frame of the photovoltaic cell laminate of the present invention is simple in structure, and there is no need for the frame to be designed as a fixing member for mounting the photovoltaic system; as the frame is light in weight, it can significantly reduce the weight of the photovoltaic cell laminate  1  and easily meet the requirements of related standards for the maximum weight of the photovoltaic module of rooftops. 
     Orientation terms mentioned in the application, such as “front”, “back”, “top”, “bottom”, “upper”, “lower”, “left”, “right” and etc., are only for describing a relative positional relationship between the individual members, but are not intended to limit an absolute orientation of related members. Referring to  FIG. 2 , the positive x-axis represents the front, and the negative x-axis represents the back; the positive y-axis represents the left, and the negative y-axis represents the right; and the positive z-axis represents the upper, and the negative z-axis represents the lower. 
     With reference to  FIGS. 3 to 6 , the support  2  comprises a supporting portion  20 , a first connecting portion  22 , a transition portion  24  and a second connecting portion  26 . Preferably, the supporting portion  20  has a support face for supporting the photovoltaic cell laminate  1  and is affixed to the back surface of the photovoltaic cell laminate  1  by adhesive for supporting the photovoltaic cell laminate  1 . The supporting portion  20  has a receiving groove  202  at a side thereof for affixing the photovoltaic cell laminate  1 . The first connecting portion  22  extends forwardly from a front end of the supporting portion  20 , and is disposed close to a front side of the photovoltaic cell laminate  1 . The transition portion  24  extends backwardly from a back end of the supporting portion  20  and is adapted for connecting the supporting portion  20  and the second connecting portion  26 . The second connecting portion  26  further extends backwardly from the transition portion  24 , and is disposed close to a back side of the photovoltaic cell laminate. In one embodiment, the first connecting portion  22  extends from a first end of the supporting portion  20  beyond the front side of the photovoltaic cell laminate  1 . The transition portion  24  and the second connecting portion  26  extend from an opposite second end of the supporting portion  20  beyond the back side of the photovoltaic cell laminate  1 . 
     When the photovoltaic module  200  is mounted onto the installation surface of the building, the first connecting portion  22  and the second connecting portion  26  is placed on the installation surface for cooperating with the installation surface. The supporting portion  20  is disposed at a certain angle to the installation surface so that the photovoltaic cell laminate  1  is also at a certain angle to the installation surface after assembled. Such a tilting arrangement of the photovoltaic cell laminate  1  will be helpful for collecting solar energy by the photovoltaic cell laminate  1  and for better converting sunlight into electricity and for making effective use of area of the installation surface such as a rooftop. Factors such as power conversion and effective use of installation area should be taken into consideration in arranging an angle between the photovoltaic cell laminate  1  and the installation surface such that, the photovoltaic modules will not be shielded from each other when the sunlight is shining. The angle is preferably in a range of 5-20°. In one embodiment, the first connecting portion  22  and the second connecting portion  26  is located on the same horizontal surface. 
     Mainly referring to  FIGS. 5 to 8 , when a plurality of photovoltaic modules  200  are mounted end to end (i.e., in a front-to-back direction) onto the installation surface, the first connecting portion  22  of one photovoltaic module  200  is engaged with the second connecting portion  26  of another adjacent photovoltaic module  200  so that a relative position of the photovoltaic module  200  and another adjacent photovoltaic module  200  is maintained. The first connecting portion  22  and the second connecting portion  26  of the present invention are arranged to be a structure that can cooperate and lock with each other. In a specific embodiment of the present invention, the first connecting portion  22  and the second connecting portion  26  both are in a frame shape, and the first connecting portion  22  is sized to be greater than the second connecting portion  26  so that the first connecting portion  22  can cover the second connecting portion  26 . The first connecting portion  22  has a first fixing portion  222  disposed thereon, and the second connecting portion  26  has a second fixing portion  262  disposed thereon and corresponding to the first fixing portion  222  of the first connecting portion  22 . Preferably, the first connecting portion  22  comprises at least two first fixing portions  222 , and the second connecting portion  26  comprises the second fixing portions  262  having at least the same number corresponding to the number of the first fixing portions  222 . The first fixing portions  222  are respectively disposed at the opposite sides of the first connecting portion  22 , and the second fixing portions  262  are respectively disposed at the opposite sides of the second connecting portion  26 . At least one of the first fixing portion  222  and the second fixing portion  262  is a resilient structure. When the first connecting portion  22  of one photovoltaic module  200  is engaged with the second connecting portion  262  of another adjacent photovoltaic module  200 , the resilient structure is first pressed by the other of the first fixing portion  222  and the second fixing portion  262  and is deformed resiliently, and then the resilient structure is returned resiliently due to release of the press and is thus locked. The first fixing portion  222  and the second fixing portion  262  cooperate and lock with each other so that a relative position of the first fixing portion  222  and the second fixing portion engaged is restricted. In one embodiment, the first fixing portion  222  is configured to be bumps projecting inwardly from lower edges of apertures of opposite two side walls, and the second fixing portion  262  is configured to be resilient tabs deflected outwardly from opposite two side walls. The resilient tabs are locked with the bumps of the lower edges of the apertures. The first connecting portion  22  has a protrusion  224  protruding downwardly from a top thereof. A first mounting hole  226  is defined through the protrusion  224 . The second connecting portion  26  defines a second mounting hole  266  corresponding to the protrusion  224 . When the first connecting portion  22  of one photovoltaic module  200  is engaged with the second connecting portion  26  of another adjacent photovoltaic module  200 , the protrusion  224  of the first connecting portion  22  of the photovoltaic module  200  is inserted into the second mounting hole  266  of another adjacent photovoltaic module  200 , and the first mounting hole  226  is aligned with the second mounting hole  266 . 
     The support  2  of the photovoltaic module  200  in accordance with the present invention is designed to have the first connecting portion  22  and the second connecting portion  26  which can cooperate with each other and can be locked together by means of cooperation between the first connecting portion  22  and the second connecting portion  26  of adjacent two photovoltaic modules  200 , in such a manner, it can be realized that the adjacent two photovoltaic modules  200  are connected in a front-to-back direction without an additional connector structure. As shown in  FIG. 7  and  FIG. 8 , when adjacent two photovoltaic modules  200  are required to be connected in a front-to-back direction, the first connecting portion  22  of the support  2  of one photovoltaic module  200  covers the second connecting portion  26  of the support  2  of another adjacent photovoltaic module  200 . The protrusion  224  of the first connecting portion  22  is received in the second mounting hole  266  of the second connecting portion  26 , and the second mounting hole  266  is aligned with the first mounting hole  226 . The second fixing portion  262  of the second connecting portion  26  may lock in the first fixing portion  222  of the first connecting portion  22  so that the first connecting portion  22  and the second connecting portion  26  are locked with each other, thereby realizing a connection in a front-to-back direction between adjacent two photovoltaic modules  200 . For connecting more photovoltaic modules  200  in a front-to-back direction, a similar connecting manner above can be adopted for connection. The end-to-end mode of connection is very simple and easy to operate, whereby the assembly procedure of the photovoltaic system  100  is simplified to a great extent and the working efficiency is improved. 
     The above is described by taking an example in which both the first connecting portion  22  and the second connecting portion  26  are in a frame shape, but the present invention is not limited to the example herein. The first connecting portion  22  and the second connecting portion  26  of the present invention can also adopt other structures which can cooperate and lock with each other without departing from the spirit of the present invention. Furthermore, in an alternative embodiment of the present invention, it can be also adopted that the second connecting portion  26  is sized to be greater than the first connecting portion  22  so that the second connecting portion  26  covers the first connecting portion  22 . These can also achieve the objectives of the present invention. In a further embodiment of the present invention, the first fixing portion  222  of the first connecting portion  22  and the second fixing portion  262  of the second connecting portion  26  can be also disposed in reverse or can adopt other locking manners. All of these equivalent substitutions and deformations are covered in the protective scope of the present invention. 
     See  FIG. 9  and  FIG. 10 , in an alternative embodiment of the present invention, optionally, the photovoltaic system  100  may further comprise a plurality of ballasts  6  in order to increase reliability of the photovoltaic module on the installation surface such as rooftop depending on the local climate. The ballast  6  is pressed on the first connecting portion  22  and the second connecting portion  26  which are connected to each other. The ballast  6  defines a mounting hole  60  corresponding to the first mounting hole  226  of the first connecting portion  22  and/or the second mounting hole  266  of the second connecting portion  26 . 
     When a plurality of photovoltaic modules  200  is mounted onto the installation surface, and the first connecting portion  22  of one photovoltaic module is engaged with the second connecting portion  26  of another adjacent photovoltaic module, for an engaged portion of the photovoltaic modules in a front-to-back direction, since the first connecting portion  22  of one photovoltaic module covers the second connecting portion  26  of another adjacent photovoltaic module, the ballast  6  is fixed on a location where the first connecting portion  22  and the second connecting portion  26  are engaged via a pin  64  sequentially passing through the mounting hole  60  of the ballast  6 , the first mounting hole  226  of the first connecting portion  22  and the second mounting hole  266  of the second connecting portion  26 . For the photovoltaic module  200  at one outmost end of array of the photovoltaic system, the ballast  6  is fixed on the first connecting portion  22  via a pin  64  sequentially passing through the mounting hole  60  of the ballast  6  and the first mounting hole  226  of the first connecting portion  22 . For the photovoltaic module  200  at the other outmost end thereof, the ballast  6  is fixed on the second connecting portion  26  via a pin  64  sequentially passing through the mounting hole  60  of the ballast  6  and the second mounting hole  266  of the second connecting portion  26 . Preferably, in order that the ballast  6  may better support on the surface of the building, the ballast  6  further provides a plurality of supporting posts  62  at the bottom thereof for supporting on the installation surface of the building. 
     During assembly of the photovoltaic system  100 , for the purpose of preventing wind from affecting stability of the whole photovoltaic system, it is usually required to install wind deflectors to change the flow of wind. As shown in  FIG. 1 , when the photovoltaic module  200  is mounted onto the installation surface, the back wind deflector  3 ,  4  is mounted close to the back side of the photovoltaic cell laminate  1 , and substantially shields a space between the back side of the photovoltaic module  200  and the installation surface. In view of the issue of the cooling of the photovoltaic module, the back wind deflector  3 ,  4  defines a plurality of openings  30 ,  40 . The openings  30 ,  40  may be round or polygonal through holes, or may also be shutter holes in an alternative preferred embodiment so that this will not only allow the cooling of the photovoltaic modules  200 , but also not affecting function of deflecting wind. The back wind deflector  3 ,  4  is fixed onto the supports  2  of at least two photovoltaic modules  200  side by side in a left-to-right direction so as to restrict a relative position of the at least two adjacent photovoltaic modules  200  in a left-to-right direction. In detail, the back wind deflector  3 ,  4  is fixed onto the transition portions  24  of the supports  2  of adjacent photovoltaic modules  200  so that the adjacent photovoltaic modules  200  are connected together side by side. 
     In conjunction with  FIGS. 1 and 11  to  12 , the back wind deflector  3 ,  4  includes a middle wind deflector  3  and an exterior wind deflector  4 . The middle wind deflector  3  has a length substantially equal to that of the back side of the photovoltaic cell laminate  1 , and is adapted for side by side connection of adjacent two photovoltaic modules  200  in a left-to-right direction. The middle wind deflector  3  defines a pair of notches  32  corresponding to adjacent transition portions  24  of two photovoltaic modules  200  in a side-by-side arrangement. The transition portion  24  may be received in the notch  32 . The transition portion  24  defines a positioning hole  242  and a plurality of fixing holes  244  (as shown in  FIG. 5 ) thereon. The middle wind deflector  3  provides in the notch  32  a plurality of hooks  36  projecting and corresponding to the fixing holes  244 . The plurality of hooks  36  are respectively locked in the plurality of fixing holes  244 . The middle wind deflector  3  provides a positioning post  34  projecting and corresponding to the positioning hole  242 , and the positioning post  34  may be positioned in the positioning hole  242 . An abdication portion  246  for receiving an upper side of the middle wind deflector  3  is disposed at a top of a junction of the supporting portion  20  and the transition portion  24 . 
     Returning to  FIG. 1 , when adjacent two photovoltaic modules  200  such as the first photovoltaic module  200   a  and the third photovoltaic module  200   c , are required to be connected side by side in a left-to-right direction, the transition portion  24  of the supporting portion  20  of the first photovoltaic module  200   a  and the transition portion  24  of the supporting portion  20  of the third photovoltaic module  200   c  are respectively received in a pair of notches  32  of the same middle wind deflector  3 . The positioning post  34  of the middle wind deflector  3  is first positioned in the positioning hole  242  so that the middle wind deflector  3  is first positioned in the first photovoltaic module  200   a  and the third photovoltaic module  200   c , then the hooks  36  of the middle wind deflector  3  are locked in the fixing holes of the transition portion  24 , and the upper side of the middle wind deflector  3  is locked in the abdication portion  246  of the support  2  so that the middle wind deflector  3  is fixed on the adjacent two transition portions  24  of the first photovoltaic module  200   a  and the third photovoltaic module  200   c  in a side-by-side arrangement. Therefore, the adjacent first photovoltaic module  200   a  and third photovoltaic module  200   c  are connected side by side by means of the middle wind deflector  3 . For a side-by-side connection between the second photovoltaic module  200   b  and the fourth photovoltaic module  200   d , or even for side by side connection of more photovoltaic modules  200 , a similar connecting manner above may be adopted for connection. As shown in  FIG. 1 , the photovoltaic modules  200  are arranged in an array form by the front-to-back connection and the side-by-side connection of the photovoltaic modules  200  above-mentioned. 
     By cleverly using the middle wind deflector  3  and by means of cooperation and lock between the middle wind deflector  3  and adjacent two transition portions  24  of adjacent two photovoltaic modules  200 , the present invention can achieve the side-by-side connection of any number of photovoltaic modules  200  in a left-to-right direction without an additional connector structure. Thus, the side-by-side connection in a left-to-right direction of the present invention has such advantages as being simple and rapid, thereby greatly saving the assembly procedure and the number of parts of the photovoltaic system  100  and improving the working efficiency. The middle wind deflector  3  according to the present invention has dual functions, that is, on the one hand, the middle wind deflector  3  may perform general functions as a wind deflector in preventing an array of the photovoltaic system from the impact of the wind so that the array of photovoltaic system may be stably retained on the installation surface; on the other hand, it functions as a connector structure for side by side connection of the photovoltaic modules  200  so that additional connectors may be omitted upon the side-by-side connection, thereby saving on the number of parts and reducing the costs for the photovoltaic system  100 . 
     The exterior wind deflector  4  has a configuration similar to half of the middle wind deflector  3 . In conjunction with  FIG. 12 , the exterior wind deflector  4  defines a notch  42  corresponding to the transition portion  24  of the support of the photovoltaic module  200 . The exterior wind deflector  4  provides in the notch  42  a plurality of hooks  46  projecting and corresponding to the fixing holes  244  of the transition portion  24 , and a positioning post  44  projecting and corresponding to the positioning hole  242  of the transition portion  24 . In conjunction with  FIG. 1 , the exterior wind deflector  4  is installed close to an outer end of the back side of the photovoltaic module  200  located at the outmost end thereof. The transition portion  24  of the supporting portion  20  of the photovoltaic module  200  located at the outmost end thereof is received in the notch  42  of the exterior wind deflector  4 , and the positioning post  44  of the exterior wind deflector  4  is positioned in the positioning hole  242  of the transition portion  24 , so that the exterior wind deflector  4  is first positioned in the photovoltaic module  200  located at the outmost end thereof, and the hooks of the exterior wind deflector  4  are further locked in the fixing holes  244  of the transition portion  24 . The exterior wind deflector  4  is thus fixed on the transition portion  24  of the outmost side of the photovoltaic module  200  at the outmost end thereof. 
     In conjunction with  FIGS. 13 to 18 , when a plurality of photovoltaic modules  200  is placed or transported in stack, the support  2  of one photovoltaic module  200  can support on the support  2  of another adjacent photovoltaic module  200 , and the photovoltaic cell laminate  1  of each of the photovoltaic modules  200  is not extruded by other photovoltaic modules  200  in stack. 
     In conjunction with  FIGS. 16 to 18 ,  FIG. 16  and  FIG. 17  are respectively enlarged views of local regions D and E of  FIG. 15 , and  FIG. 18  is a cross-sectional view of  FIG. 13  taken along line C-C. The support comprises a first upper restricting portion  227 , a first lower restricting portion  228 , a second upper restricting portion  247  and a second lower restricting portion  248 . The first upper restricting portion  227  and the first lower restricting portion  228  are configured to be beyond the front side of the photovoltaic cell laminate  1 , and the second upper restricting portion  247  and the second lower restricting portion  248  are configured to be beyond the back side of the photovoltaic cell laminate  1 . The first upper restricting portion  227  and the first lower restricting portion  247  are close to a junction of the first connecting portion  22  and the supporting portion  20 , and the second upper restricting portion  228  and the second lower restricting portion  248  are close to a junction of the second connecting portion  26  and the transition portion  24 . The first upper restricting portion  227  and the second upper restricting portion  247  are disposed at a top of the support  2 . The first upper restricting portion  227  has a backward restricting surface and the second upper restricting portion  247  has a forward restricting surface. The first lower restricting portion  228  and the second lower restricting portion  248  are disposed at a bottom of the support  2 . The first lower restricting portion  228  has a forward restricting surface and the second lower restricting portion  248  has a backward restricting surface. In one embodiment, the first upper restricting portion  227  and the second upper restricting portion  247  are represented by restricting projections projecting upwardly from the top, and the first lower restricting portion  228  and the second lower restricting portion  248  are represented by stiffening ribs extending in a left-to-right direction from the bottom. 
     As shown in the enlarged, local views of  FIG. 17  and  FIG. 18 , when a plurality of photovoltaic modules  200  are stacked, the first upper restricting portion  227  of one photovoltaic module  200  leans against the first lower restricting portion  228  of another adjacent photovoltaic module  200 . In detail, the restricting surface of the first upper restricting portion  227  of one photovoltaic module  200  leans against the restricting surface of the first lower restricting portion  228  of another adjacent photovoltaic module  200 . The second upper restricting portion  247  of one photovoltaic module  200  leans against the second lower restricting portion  248  of another adjacent photovoltaic module  200 . In detail, the restricting surface of the second upper restricting portion  247  of one photovoltaic module  200  leans against the restricting surface of the second lower restricting portion  248  of another adjacent photovoltaic module  200 . Therefore, movement of the photovoltaic module  200  relative to another adjacent photovoltaic module  200  in a front-to-back direction is restricted, i.e., a relative movement in an end-to-end direction is restricted, thereby facilitating the transportation of the photovoltaic modules  200 . 
     Referring particularly to  FIG. 18 , the support  2  further comprises a third upper restricting portion  249   a  and a third lower restricting portion  249   b . When a plurality of photovoltaic modules  200  is stacked, the third upper restricting portion  249   a  of one photovoltaic module  200  cooperates with the third lower restricting portion  249   b  of another adjacent photovoltaic module  200 , so that movement of the photovoltaic module  200  relative to another adjacent photovoltaic module  200  in a left-to-right direction is restricted. In a specific embodiment, left and right sides of the transition portion  24  form a shape which is narrow at an upper thereof and is wide at a lower thereof. The uppers of the left and right sides of the transition portion  24  form the upper stopping wall and the left and right sides of the transition portion  24  extend downwardly to form the lower stopping wall. When the third upper restricting portion  249   a  of one photovoltaic module  200  cooperates with the third lower restricting portion  249   b  of another adjacent photovoltaic module  200 , outer sides of the uppers (i.e., the upper stopping wall) of the left and right sides of the transition portion  24  cooperate with inner sides of the lowers (i.e., the lower stopping wall) of the left and right sides of the transition portion  24 , so that the photovoltaic module  200  located at the upper can protect photovoltaic module  200  located at the lower, and the movement of the photovoltaic module  200  relative to another adjacent photovoltaic module  200  in a left-to-right direction is prevented, thereby further facilitating the transportation of the photovoltaic modules  200 . 
     Preferably, in conjunction with  FIG. 6 , the support  2  has a plurality of stiffening ribs  290  extending in a front-to-back direction at a side thereof far from the photovoltaic cell laminate  1  and defines a receiving slot  292  located among the plurality of stiffening ribs. The stiffening ribs  290  are adapted for strengthening the photovoltaic module  200 . As shown in  FIG. 4 , the lower wind deflector  5  of the photovoltaic system  100  is mounted in the receiving slot  292 . As shown in  FIG. 1 , after the photovoltaic modules  200  are assembled in a required array form, the lower wind deflector  5  is installed in a lower of the photovoltaic module  200  located in the outmost side thereof, and the lower wind deflector  5  is installed in the receiving slot  292  of the support  2  of the photovoltaic module  200  located in the outmost side thereof. 
     Although the present invention is disclosed by the preferable embodiments as discussed above, but these embodiments are not intended to be limitative, and potential variations and modifications can be made by any one skilled in the art without departing from the spirit and scope of the present invention, so the protective scope of the present invention should cover all as defined in the attached claims.