WO2013038409A2

WO2013038409A2 - Electrical joint

Info

Publication number: WO2013038409A2
Application number: PCT/IL2012/050361
Authority: WO
Inventors: Itay Baruchi; Alon Naim; Barak Freedman; Pasha Solel
Original assignee: Pythagoras Solar Inc.
Priority date: 2011-09-12
Filing date: 2012-09-11
Publication date: 2013-03-21
Also published as: WO2013038409A3

Abstract

An electrical joint is provided for a window including at least two window panes defining a cavity therebetween, a spacer disposed about the perimeter of the cavity, and a photovoltaic system mounted in the cavity. The electrical joint includes a base member having at least one humidity impermeable layer, a throughgoing bore, and a coupling portion for sealingly mounting thereof to an opening in the spacer such that the bore extends between the inside of the cavity and the outside thereof. The electrical joint further includes at least one conducting wire sealingly disposed in the bore, configured for electrically coupling a first end thereof to the photovoltaic system and a second end thereof to an electric element outside the cavity.

Description

ELECTRICAL JOINT

TECHNOLOGICAL FIELD

The presently discloses subject matter relates to an electrical joint for mounting in window in general, and in particular to an electrical joint for mounting in window having a PV system mounted therein.

BACKGROUND

Insulated glazing (IG), also known as double glazing units, is a double or triple glass window panes separated by an air or other gas filled space to reduce heat transfer across a part of the building envelope. The glass panes are separated by a spacer, which seals the gas space therebetween.

As shown in Fig. 1, a prior art double glazing units 10, includes two window panes 12a and 12b parallely disposed with respect to one another, defining a cavity 14 therebetween. The two window panes 12a and 12b are coupled to one another by means of a spacer 15 disposed about the perimeter of thereof. The spacer 15 is typically a metal profile which serves as a barrier between the inside of the cavity 14 and the outside environment, thereby reducing humidity penetration therein and precluding condensation inside the cavity 14. In addition, a sealing material 16 having a high level of impermeability, such as Butyl rubber (Polyisobutylene - PIB), is provided between the spacer 15 and each of the window panes 12a and 12b, so as to further preclude penetration of humidity into the cavity 14. According to an example, the spacer includes a hollow inner volume 17 filled with a desiccant 18 configured to absorb humidity and moisture captured in the cavity 14 during the manufacturing process as well as a humidity and moisture which might penetrate through the metal spacer 15.

The two window panes 12a and 12b, the spacer 15 therebetween, and the sealing material 16 are structurally held by an adhesive material 20, such as a silicone based adhesive, which is also configured to prevent water in its liquid form, from reaching the spacer 15 and/or the sealing material 16. In order to further structurally support to two window panes a window frame 22 is provided, such which

WO/2011/048595 discloses a photovoltaic glazing unit (PVGU) which includes a double glazing window system having an optical and a photovoltaic systems imbedded therein. The photovoltaic glazing unit allows generation of solar energy while retaining the window transparence. The combined PV and optical system are incorporated into the double glazing air cavity.

The double glazing unit requires that the cavity therein preserves the thermal properties of the window. That is to say, imbedding the combined optical and PV system into the cavity should be in such a way which does not compromise the sealing properties of the window system. Sealing breach can cause both reduction of window transparency due to condensation and can harm the PV electrical system.

GENERAL DESCRIPTION

There is provided according to one aspect of the presently disclosed subject matter a method for providing an electrical connection between photovoltaic system mounted within a cavity of a window having at least two window pane defining the cavity therebetween and a spacer disposed about the perimeter of the cavity, and an external electric element outside the cavity. The method comprising: forming in a portion of thespacer an opening, mounting in the opening a base member with a throughgoing bore extending between the inside of the cavity and the outside thereof, passing one or more conducting wires through thebore, sealing the opening with humidity impermeable sealing material so as to prevent humidity from entering inside the cavity, and electrically coupling a first end of the or each wire to the photovoltaic system and a second end thereof to the external electric element.

The method can include providing a conductor member disposable in the bore and holding the one or more conducting wires.

The conductor member can be selected from a plurality of conductor members differing in at least one of the number of the wires, their characteristics and their arrangement within the conductor member. The conductor members can be configured for use with different photovoltaic systems.

The base member can be selected from a plurality of base members differing in at least one of the peripheral dimensions thereof, wherein the dimensions of the throughgoing bore in the plurality of the base members is identical. The base members can be configured for use with different spacer.

The method can further comprise providing the conductor member and the base member with at least one layer of a humidity impermeable material.

The at least a portion of the base member can be made of a humidity impermeable material preventing humidity from entering inside the cavity.

The step of mounting the base member can include mounting in a hollow portion of thespacer at least one mounting arm provided on the base member.

The at least one mounting arm can include at least one groove.

The method can further comprise filling the groove with a humidity impermeable sealing material.

According to another aspect of the presently disclosed subject matter there is provided an electrical joint for a window including at least two window panes defining a cavity therebetween, a spacer disposed about the perimeter of the cavity, and a photovoltaic system mounted in the cavity. The electrical joint includes a base member having at least one humidity impermeable layer, a throughgoing bore, and a coupling portion for sealingly mounting thereof to an opening in the spacer such that thebore extends between the inside of the cavity and the outside thereof. The electrical joint further includes at least one conducting wire sealingly disposed in thebore, configured for electrically coupling a first end thereof to the photovoltaic system and a second end thereof to an electric element outside the cavity.

The electrical joint can further include a conductor member sealingly disposed in thebore and having at least one humidity impermeable layer, wherein theat least one conducting wire is mounted in theconductor member.

The conductor member can include at least one aperture configured for sealingly mounting the conducting wire therein.

The at least one aperture can be a concaved aperture sealed with a humidity impermeable material. The conductor member can include at least one humidity impermeable layer. The layer is a conductive plate having an electrically insulated opening for receiving the at least one conductive wire therethrough. The layer can cover at least the majority of the base member.

The conductor member can be made of a material having a low level of flammability and high relative thermal index.

The coupling portions are at least one mounting arm configured to be sealingly mounted inside a hollow section of the spacer. The mounting arms can include grooves for receiving humidity impermeable sealing material therein.

According to another aspect of the presently disclosed subject matter there is provided a window comprising: at least two window pane defining a cavity therebetween, a spacer sealingly disposed in the cavity about the periphery of the window panes, a photovoltaic system mounted in the cavity, and at least one electrical joint mounted in an opening in the spacer. The electrical joint includes a base member for sealingly mounting in the opening, the base member having at least one humidity impermeable layer, a throughgoing bore, and a coupling portion for sealingly mounting thereof to an opening in the spacer such that the bore extends between the inside of the cavity and the outside thereof. The electrical joint further includes at least one conducting wire sealingly disposed in the bore, configured for electrically coupling a first end thereof to the photovoltaic system and a second end thereof to an electric element outside the cavity.

The at least one electrical joint further comprising a conductor member sealingly disposed in the bore and having at least one humidity impermeable layer, wherein the at least one conducting wire is mounted in the conductor member.

The at least one aperture can be a concaved aperture sealed with a humidity impermeable material. The conductor member can include at least one humidity impermeable layer. The layer can be a conductive plate having an electrically insulated opening for receiving the at least one conductive wire therethrough. The layer can cover at least the majority of the base member.

The conductor member can be made of a material having a low level of flammability and high relative thermal index. The coupling portions can be at least one mounting arm configured to be sealingly mounted inside a hollow section of the spacer.

The at least one electrical joint include a first electrical joint and a second electrical joint, the conducting wire of the first electrical joint is coupled to the positive terminal of the photovoltaic system, and the conducting wire of the second electrical joint is coupled to the negative terminal of the photovoltaic system.

According to yet another aspect of the presently disclosed subject matter there is provided a method for forming a doubled glazed window having a photovoltaic system mounted therein. The method comprising: providing two window panes, sealingly disposing a spacer between the two window panes, about the periphery thereof thereby defining a cavity therebetween, forming an opening in the spacer, mounting a photovoltaic system in the cavity, and sealingly mounting an electrical joint in the opening. The electrical joint includes a base member for sealingly mounting in the opening, the base member having a throughgoing bore defined between the inside of the cavity and the outside thereof and at least one conducting wire disposed in the bore, configured for electrically coupling a first end thereof to the photovoltaic system and a second end thereof to an electric element outside the cavity. The method further comprising providing the electrical joint with at least one humidity impermeable layer for sealing the cavity against humidity from the outside thereof.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to better understand the subject matter that is disclosed herein and to exemplify how it may be carried out in practice, embodiments will now be described, by way of non-limiting example only, with reference to the accompanying drawings, in which:

Fig. 1A is perspective view of a prior art double glazed window;

Fig. IB is side sectional view of a portion of a prior art double glazed window;

Fig. 2 A is a perspective view of a base member of an electrical joint according to one example of the presently disclosed subject matter;

Fig. 2B is a perspective view of a conductor member for mounting inside the base member of Fig. 2A;

Fig. 3 is a perspective view of the base member of Fig. 2A having the conductor member of Fig. 2B mounted therein; Fig. 4 is a perspective view of a conductor according to another example of the presently disclosed subject matter;

Fig. 5A is a perspective view of a window spacer having the base member of Fig. 2A mounted therein;

Fig. 5B is an enlarged view of the spacer of Fig. 5A having an electrical joint mounted therein;

Fig. 6A is an exploded view of a doubled glazed window having a PV system and an electrical joint mounted therein; and,

Fig. 6B is a side perspective view of the window of Fig. 6 A having a window frame.

DETAILED DESCRIPTION OF EMBODIMENTS

The presently disclosed subject matter relates in one aspect thereof to a method for providing an electrical connection between PV system mounted within a cavity of a doubled glazed window and an external electric element. The electrical connection is formed by an electrical joint sealingly mounted in the spacer disposed between the window panes of the window.

Fig. 2A shows an electrical joint 30 which includes a base member 32 having a throughgoing bore 34, and a coupling portion 35 for sealingly mounting thereof to an opening in a doubled glazed window spacer such that the bore 34 extends between the inside of the cavity and the outside thereof. The electrical joint 30 further includes at least one conducting wire sealingly disposed in the bore 34, configured for electrically coupling a first end thereof to the photovoltaic system and a second end thereof to an electric element outside the cavity.

The base member 32 can be made of a metallic material having a low level of humidity permeability. Alternatively, the base member 32 can be made of plastic having a low level of humidity permeability and can be manufactured using standard injection molding technologies as well as other plastic part manufacturing techniques. The material can also be configured to retain low level of flammability and high relative thermal index (RTI, both mechanical and electrical). Such material can be for example PPO (Polyphenylene oxide) or PPE (Polypheny lene ether), or its blends with PS (Polystyrene), such as Noryl (by Sabic), a blend of PPO+PS or PPE+PS. The coupling portion 35 according to the illustrated example is a pair of coupling arms 35a and 35b extending from two opposing sides of the base member 32. The coupling arms 35a and 35b are configured to be inserted inside a hollow portion of a spacer disposed between the two window panes, as described in detail herein after with regards to Fig. 5A.

In order to obtain maximal sealing between the joint and the spacer, the coupling arms 35a and 35b can be provided with grooves and ridges for inserting therebetween sealing material, such as Butyl rubber (Polyisobutylene).

According to an example, illustrated in Figs. 2B and 3, the conductive wire is in a form of a conductor member 36 which is configured to be sealingly disposed in the bore 34 and further includes one or more wires extending therethrough, here illustrated as a pair of conducting flat pins 38. The conductor member 36 can have a shape complementary to the shape of the bore 34, such that mounting thereof in the bore completely seals the bore. This way, a photovoltaic system can be provided with a conductor member 36, which is configured to be mounted inside a bore 34 of any base member 32. Thus, the base members 32 can be adapted and configured to be coupled to a specific spacer having a certain dimension, and having a bore 34 which is adapted to receive a universal conductor member. Accordingly, when forming a double glazed window having a PV system, a base member 32 is selected so as to fit the dimensions of the spacer of the window, while the conductor member 36 can be manufactured as a standard member adapted to fit a bore of any base member 32.

The conductor member 36 can further include a stop member for retaining thereof in place when disposed inside the bore 34. For example, the conductor member 36 can include a shoulder portion 39 configured to engage a complementary shoulder portion (not shown) defined about the inner perimeter of the bore 34, thus precluding the displacement of the conductor member 36 outside the bore 34.

The conductor member 36 can be made from an electrically insulating material such as plastic, so as to allow extending a conductive wire therethrough. Since plastic martial is a humidity permeable material, a humidity impermeable layer 40 can be provided. The humidity impermeable layer 40 can be a metal or a glass sheet provided with slit 42 for extending theretrough the conductive flat pins 38. It is appreciated that the impermeable layer 40 can be adapted to cover only the conductor member 38, or can be adapted to cover the base member 32 or portions thereof, as well. The metallic layer serves as humidity barrier so as to significantly reduce the humidity permeability and thus increase the durability of the double glazing system. The conductor member as well as the base member 32 can also be coated or co-injected with a second layer of material with lower permeability such as epoxy based materials.

It is further appreciated that in case the layer 40 is a metal layer, the slit 42 can be coated with an electrically insulating material so as to preclude electrically coupling the two conductive flat pins with one another or with the spacer of the window.

According to another example the humidity impermeable layer is integrated in the conductor member 36, such as a metallic layer embedded inside the conductor member 36, or a conductor member, which is made of a metallic material. In the latter case, the conducting wires 38 extending through the conductor member 36 are coated with an electrically insulating material.

Reference is now made to Fig. 4, a conductor member 50 can be formed with one or more concaved apertures 52 for inserting therethrough a conductive flat pin 54. The concaved aperture 52 is filled with an insulating material 56 such which is substantially humidity impermeable for example, butyl rubber (Polyisobutylene) or epoxy adhesive which is configured to eliminate any penetration of humidity due to separation between the flat pin 54 and the body of the conductor member 50.

When assembling a double glazed window having a photovoltaic system embedded therein, a spacer is formed for disposing between the two window panes about the perimeter thereof. As shown in Fig. 5A, the spacer 60 can be a hollow profile 62 having two side walls 64a and 64b, and is bent such that it defines the size of the cavity formed between the window panes. An opening 65 is formed in the spacer profile 62, for mounting therein an electric joint, for example the electrical joint 30 of Fig. 2A. It is appreciated that in case the electrical joint includes a conductor member for mounting in a bore of a base member, only the base member is mounted in the opening 65. Thus, the base member 32 is mounted in the opening 65 by inserting the coupling arms (not shown) into the hollow section of the spacer profile 62. The opening 65 can be formed by bending the spacer profile 62 to form an almost enclosed shape, here illustrated as a rectangular shape for a rectangular doubled glazed window. The spacer profile 62 is bent such that a first end 66a thereof does not engage the second end 66b thereof, rather leaving a gap in between, which constitutes the opening 65 for receiving the base member 32 therein. This way, the base member 32 completes the bent spacer profile 62 to form together an enclosed spacer 60 to be disposed between two window panes. Alternatively, the spacer can be a complete enclosed shaped profile, and an opening can be formed therein, such which can receive a base member of an electrical joint.

The base member can be mounted inside the opening by inserting the coupling arms 35a and 35b inside the hollow portion of the first end 66a and the second end 66b of the profile 62, respectively. In addition, the hollow portion of the profile 62 can be filled with a desiccant 18.

Referring now to Figs. 6 A and 6B, the spacer 60 is disposed on a first window pane 72a of a window 70, by coupling the first side wall 64a of the profile 62 such that the spacer 60 defined a delimited area on the inner surface of the window pane 72a, thereby defining a cavity 75. Sealing material, such as Butyl rubber, can be disposed between the window pane and the side wall 64a of the profile 62, so as to preclude humidity form penetrating in between. A PV system 74 is disposed in the cavity 75, and can be attached to the window pane 72a or the spacer profile 62. The PV system 74 can include a conductor member, such as the conductor member 36 of Fig. 2B, having a pair of conducting flat pins 38 and shoulder portion 39.

The conductor member 36 can be readily made as part of the PV system 74 or can be coupled thereto as part of the assembling process of the window 70. Thus, when disposing the PV system 74 in the cavity 75 the conductor member 36 is mounted inside the bore 34 such that the flat pins 38 protrudes through the bore outside the cavity. According to an example, the shoulder portion 39 of the conductor member 36 bears against the complementary shoulder portion (not shown) inside the bore 34 such that the conductor member is retained therein and cannot be released from the outside of the cavity 75.

According to an example, in order to obtain mechanical bonding and sealing between the conductor member 36 and the base member 32, a low permeability adhesive can be applied on the inner part of the bore 34.

Once the PV system 74 is firmly placed in the cavity 75 and the conductor member 36 is disposed inside the bore having the pins extending outside thereof, a second window pane 72b is placed on the spacer 60. The second window pane 72b is coupled to the second side wall 64b of the spacer profile 62, thus enclosing the cavity 75 and the PV system 74 therein. Sealing material, such as Butyl rubber, can be disposed between the second window pane and the side wall 64b of the profile 62, so as to preclude humidity form penetrating in between.

In order to further seal the opening 65, the base member 32 can be covered with at least one humidity impermeable layer, such as described hereinabove with regards to Fig. 3. The humidity impermeable layer can be disposed on the base member 32 and the conductor member 36 disposed inside the bore 34 thereof. The conductive pins 38 extend through the slits of the layer, which can be coated with an electrically insulating material.

As described herein above with regards to the prior art of Fig. l adhesive material 73 can be disposed on the outside periphery of the spacer 60 for retaining the windows panes 72a and 72b together. The adhesive material 73 can having characteristics of a sealing material, thus further protecting the cavity 75 against humidity. In case the window panes 72a and 72b are wider or higher than the spacer 60, and hence, when coupled to one another, the window panes extend higher that the spacer, the adhesive material 73 can be disposed in the gap formed between the two window pane. This way, the adhesive material 73 structurally hold the two window panes together. The adhesive material 73 can be disposed about the entire perimeter of the spacer 60 and the window panes 72a and 72b, or about portions thereof.

As shown in Fig. 6A and 6B, a window frame 76 can be disposed about the entire assembly, thus holding and retaining together the two window panes 72a and 72b, the spacer 60 and the PV system 74 therebetween. The window frame 76 can be a standard frame having apertures formed therein for extending the flat pins 38 therethrough. The flat pins 38 can now be coupled to any electrical device, such as a lighting device, a rechargeable battery for charging thereof by the electric power generated by the PV system 74, etc. according to another example the electric device can be external to the cavity 75 holding the PV system 74 therein, however the electric device can be held within the window frame 76. For example, an array of LED configured to illuminate inside the window 70.

According to one example, the flat pins 38 of the electrical joint are electrically coupled to a junction box. The junction box can be coupled to a plurality of electrical joints, for example from a plurality of double glazed windows having a PV system mounted therein, the junction box can be further coupled to an electrical device powered by the electricity generated by the PV systems in the windows. According to one example, the junction box is coupled to a power inverter for changing the direct current (DC) from the PV systems to an alternating current (AC) which can be used to generate devices requiring AC current, or for coupling to the utility grid.

It is appreciated that the window assembly system can include more than one electrical joint, for example at different location on the window. In that case the spacer can include more than one opening for disposing therein an electrical joint. This way, Each joint can then have a smaller aperture and the conductor conveyer can include only one conductor.

According to one example, the window assembly can include two electrical joints one at each corner thereof, the first joint can be coupled to the positive terminal of the PV system inside the window, while the second joint can be coupled to the negative terminal thereof. Accordingly, each electrical joint can include only one wire, for example a conductor member having only one flat pin. This way there is no need for extending long electrical wires throughout the cavity, between the window panes.

Those skilled in the art to which the presently disclosed subject matter pertains will readily appreciate that numerous changes, variations, and modifications can be made without departing from the scope of the invention, mutatis mutandis.

Claims

CLAIMS:

1. A method for providing an electrical connection between photovoltaic system mounted within a cavity of a window having at least two window pane defining the cavity therebetween and a spacer disposed about the perimeter of the cavity, and an external electric element outside the cavity, the method comprising:

forming in a portion of said spacer an opening;

mounting in said opening a base member with a throughgoing bore extending between the inside of the cavity and the outside thereof;

passing one or more conducting wires through said bore;

sealing said opening with humidity impermeable sealing material so as to prevent humidity from entering inside the cavity; and

electrically coupling a first end of the or each wire to the photovoltaic system and a second end thereof to said external electric element.

2. A method according to Claim 1, further comprising providing a conductor member disposable in said bore and holding said one or more conducting wires.

3. A method according to Claim 2, wherein said conductor member is selected from a plurality of conductor members differing in at least one of the number of the wires, their characteristics and their arrangement within the conductor member.

4. A method according to Claim 3, wherein said conductor members are configured for use with different photovoltaic systems.

5. A method according to Claim 2, wherein said base member is selected from a plurality of base members differing in at least one of the peripheral dimensions thereof, wherein the dimensions of said throughgoing bore in said plurality of said base members is identical.

6. A method according to Claim 5 wherein said base members are configured for use with different spacer.

7. A method according to any one of claims 2 to 6 further comprising providing said conductor member and said base member with at least one layer of a humidity impermeable material.

8. A method according to any one of claims 1 to 6 wherein at least a portion of said base member is made of a humidity impermeable material preventing humidity from entering inside the cavity.

9. A method according to any one of claims 1 to 8 wherein said step of mounting said base member includes mounting in a hollow portion of said spacer at least one mounting arm provided on said base member.

10. A method according to claim 9 wherein said at least one mounting arm includes at least one groove.

11. A method according to claim 10 further comprising filling said groove with a humidity impermeable sealing material.

12. An electrical joint for a window including at least two window panes defining a cavity therebetween, a spacer disposed about the perimeter of the cavity, and a photovoltaic system mounted in the cavity, the electrical joint comprising:

a base member having at least one humidity impermeable layer, a throughgoing bore, and a coupling portion for sealingly mounting thereof to an opening in the spacer such that said bore extends between the inside of the cavity and the outside thereof; at least one conducting wire sealingly disposed in said bore, configured for electrically coupling a first end thereof to the photovoltaic system and a second end thereof to an electric element outside the cavity.

13. The electrical joint of claim 12 further comprising a conductor member sealingly disposed in said bore and having at least one humidity impermeable layer, wherein said at least one conducting wire is mounted in said conductor member.

14. The electrical joint of claim 13 wherein said conductor member includes at least one aperture configured for sealingly mounting said conducting wire therein.

15. The electrical joint of claim 14 wherein said at least one aperture is a concaved aperture sealed with a humidity impermeable material.

16. The electrical joint of any one of claims 12 to 15 wherein said conductor member includes at least one humidity impermeable layer.

17. The electrical joint of claim 16 wherein said layer is a conductive plate having an electrically insulated opening for receiving said at least one conductive wire therethrough.

18. The electrical joint of claim 16 wherein said layer covers at least the majority of said base member.

19. The electrical joint of any one of claims 12 to 18 wherein said conductor member is made of a material having a low level of flammability and high relative thermal index.

20. The electrical joint of any one of claims 12 to 19 wherein said coupling portions are at least one mounting arm configured to be sealingly mounted inside a hollow section of the spacer.

21. The electrical joint of claim 20 wherein said mounting arms includes grooves for receiving humidity impermeable sealing material therein.

22. A window comprising:

at least two window pane defining a cavity therebetween;

a spacer sealingly disposed in said cavity about the periphery of said window panes;

a photovoltaic system mounted in said cavity; and

at least one electrical joint mounted in an opening in said spacer, said electrical joint includes:

a base member for sealingly mounting in said opening, said base member having at least one humidity impermeable layer, a throughgoing bore, and a coupling portion for sealingly mounting thereof to an opening in the spacer such that said bore extends between the inside of the cavity and the outside thereof; and

at least one conducting wire sealingly disposed in said bore, configured for electrically coupling a first end thereof to said photovoltaic system and a second end thereof to an electric element outside said cavity.

23. The window of claim 22 wherein said at least one electrical joint further comprising a conductor member sealingly disposed in said bore and having at least one humidity impermeable layer, wherein said at least one conducting wire is mounted in said conductor member.

24. The window of claim 23 wherein said conductor member includes at least one aperture configured for sealingly mounting said conducting wire therein.

25. The window of claim 24 wherein said at least one aperture is a concaved aperture sealed with a humidity impermeable material.

26. The window of any one of claims 22 to 25 wherein said conductor member includes at least one humidity impermeable layer.

27. The window of claim 26 wherein said layer is a conductive plate having an electrically insulated opening for receiving said at least one conductive wire therethrough.

28. The window of claim 26 wherein said layer covers at least the majority of said base member.

29. The window of any one of claims 22 to 28 wherein said conductor member is made of a material having a low level of flammability and high relative thermal index.

30. The window of any one of claims 22 to 29 wherein said coupling portions are at least one mounting arm configured to be sealingly mounted inside a hollow section of the spacer.

31. The window of claim 20 wherein said mounting arms includes grooves for receiving humidity impermeable sealing material therein.

32. The window of any one of claims 22 to 31 wherein said at least one electrical joint include a first electrical joint and a second electrical joint, said conducting wire of said first electrical joint is coupled to the positive terminal of said photovoltaic system, and said conducting wire of said second electrical joint is coupled to the negative terminal of said photovoltaic system.

33. A method for forming a doubled glazed window having a photovoltaic system mounted therein, the method comprising:

providing two window panes;

sealingly disposing a spacer between said two window panes, about the periphery thereof thereby defining a cavity therebetween;

forming an opening in said spacer;

mounting a photovoltaic system in said cavity;

sealingly mounting an electrical joint in said opening, said electrical joint includes:

a base member for sealingly mounting in said opening, said base member having a throughgoing bore defined between the inside of said cavity and the outside thereof;

at least one conducting wire disposed in said bore, configured for electrically coupling a first end thereof to said photovoltaic system and a second end thereof to an electric element outside said cavity; providing said electrical joint with at least one humidity impermeable layer for sealing said cavity against humidity from the outside thereof.

34. The method of claim 33 wherein said electrical joint further comprising a conductor member sealingly disposed in said bore and having at least one humidity impermeable layer, wherein said at least one conducting wire is mounted in said conductor member.

35. The method of claim 34 wherein said conductor member includes at least one aperture configured for sealingly mounting said conducting wire therein.

36. The method of claim 35 wherein said at least one aperture is a concaved aperture sealed with a humidity impermeable material.

37. The method of any one of claims 34 to 36 wherein said conductor member includes at least one humidity impermeable layer.

38. The method of claim 37 wherein said layer is a conductive plate having an electrically insulated opening for receiving said at least one conductive wire therethrough.

39. The method of claim 38 wherein said layer covers at least the majority of said base member.