SOLAR ROOF TILE ASSEMBLY
A photovoltaic solar roof tile assembly can include a roof tile having a front and a rear surface and a single hole extending through the tile. A structure can be attached to the front surface of the roof tile. The structure can include a photovoltaic solar cell that in operation can provide a single positive output connected to a positive conductor and a single negative output connected to a negative conductor. The positive conductor and the negative conductor can extend from the structure attached to the front surface of the roof tile, through the hole of the roof tile to the rear surface of the roof tile. The structure can be laminated, and can include a printed circuit board, a first layer covering a surface of the printed circuit board, a second layer covering the photovoltaic solar cell, and a front sheet covering a front face of the second layer.
The present invention relates to a photovoltaic solar panel.
BACKGROUND OF THE INVENTIONPhotovoltaic solar panels are known which absorb solar and ultra violet rays, transforming them into electrical energy.
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The back sheet portion 401, of the photovoltaic solar panel 400 comprises two surfaces 406, 407, wherein the first surface 406 may be attached to the surface of a roof tile. The second surface of the back sheet portion 407 is adjacent to a first surface 408 of encapsulation layer 402; and a second surface 409 of first encapsulation layer 402 is in adjacent contact with the photovoltaic cell 404. The photovoltaic cell is also in adjacent contact with a first surface 410 of second encapsulation layer 403; and a second surface 411 of second encapsulation layer 403 is in adjacent contact with a first surface 412 of the front sheet 405.
The term “adjacent contact with” does not necessarily mean that the second surface of the encapsulation layer s in contact with a surface of the photovoltaic cell. A layer of encapsulation material may be used between the photovoltaic cell and the back sheet 401 and/or the front sheet 405
Polyethylene terephthelate PET is a known encapsulation material, which is used in solar panels to bond front and back sheets of the panel together by the process of lamination.
Lamination of solar cells with polyethylene-vinyl acetate films is conducted at about 150° C., and permits molten polyethylene-vinyl acetate to flow into voids in a solar panels to encapsulate the solar cell.
The current lifespan of PET solar panels is in the region of 5 to 10 years.
Known photovoltaic panels do not integrate well into the architecture of older, traditional buildings.
SUMMARY OF THE INVENTIONIt is an object of the current invention to increase the efficiency and lifespan of current solar panels whilst providing a photovoltaic solar panel which can be easily integrated into various architectural surroundings.
According to a first aspect of the present invention, there is provided a photovoltaic solar panel for attachment to a roof tile configured with a through aperture, the panel comprising:
a rigid back plate;
a support sheet comprising at least one photovoltaic solar cell;
a negative and a positive connection extending from the or each solar cell through a sealed aperture of the back plate and accessible at the rear of the panel;
a diode connected to the positive connection;
an ultra-violet resistant front sheet for covering a front face of the or each solar cell;
wherein the back plate, support sheet and front sheet form a sealed laminated structure.
Other aspects of are as recited in the claims herein.
For a better understanding of the invention and to show how the same may be carried into effect, there will now be described by way of example only, specific embodiments, methods and processes according to the present invention with reference to the accompanying drawings in which:
There will now be described by way of example a specific mode contemplated by the inventors. In the following description numerous specific details are set forth in order to provide a thorough understanding. It will be apparent however, to one skilled in the art, that the present invention may be practiced without limitation to these specific details. In other instances, well known methods and structures have not been described in detail so as not to unnecessarily obscure the description.
There is disclosed herein a novel photovoltaic solar panel designed to be attached to the front face of proprietary concrete, clay, metal or plastic roof tile. The solar panel is capable of generating electricity and thus providing a solar tile. The solar tile may be fitted directly to a roof to form a flat roof surface. The apparatus is designed to fit to new and replacement roofs.
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The roof the comprises a roof tile 500, which can be a cement, plastics or metal roof tile. The solar panel comprises a silicone based adhesive sealant layer 501; a fiber glass back plate 502; a sheet 503 comprising a one or a plurality of monocrystalline or polycrystalline solar cells each comprising one or more solar wafers; and an ultra-violet transparent plastics cover sheet 504.
The one or more solar cells are sandwiched between the clear cover sheet 504, on the side of the wafer which is exposed to sun light, and the fiber glass back plate 502 at the rear side, which is adjacent the roof tile 500. The silicone based adhesive sealant layer 501 sticks a rear surface of the fiber glass back plate 502 to a front surface of the roof tile 500. The fibre glass back sheet gives rigidity and support to the sheet 503 which contains the solar cells.
The solar panel further comprises electrical connections which are accessible at the rear of the roof tile, for connecting the solar panel to an electrical circuit. The electrical connections comprise a negative connector 505; a positive connector 506; a silicone based seal 507, which fits into an aperture in the roof tile 500 and surrounds a pair of positive and negative conductors 508, 508 respectively such that the connectors are spaced apart, and protected from the weather and moisture; each electrical conductor 508, 500 comprising a copper wire surrounded with an insulating plastic sheath; a diode 510 connected to a positive output of the solar cells 503 and to positive conductor 509; and first and second aluminum strips 511, 512 which respectively form electrical connectors to the solar cells of the sheet 503, the aluminum strips each being covered with a respective strip of insulating electrical tape, the first strip 511 being connected to the positive conductor 509 via diode 510, and the second aluminum strip 512 being connected to the negative conductor 508.
The clear or transparent plastics cover sheet 504, the solar wafer sheet 503, along with first and second aluminum strip conductors 611, 512, and the fiber glass back plate 502 form a sealed laminated unit, which is sealed against the ingress of moisture.
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In the example shown, a Monocrystalline P type boron doped silicone sheet has dimensions 156 mm height by 156 mm width. The Monocrystalline silicon wafer is grown by the CZ method. Electrical characteristics of the solar sheet are as follows:
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A solar array 709 is provided and consists of a plurality of monocrystalline solar wafers 710 which are connected together in a bank of two rows.
The junction box is rated at 1000 dcV.
Each solar wafer 710 is situated on a layer of ethylene-vinyl acetate 711, which covers the surface of the printed circuit board 704.
Soldered aluminum strips 712 connect individual solar cells 710; the ends of said strips are folded over the top of the cells 710 to attach them to the circuit board 704.
The aluminum strips are covered by a strip of electrical tape and a sheet of ethylene-vinyl acetate 713. A layer of ethylene tetrafluoroethylene 714 covers the ethylene-vinyl acetate 713.
The total layered array is bound via lamination at a temperature range of 150° C. to 2000C, a vacuum pressure of 2 to 4 atmospheres for a period of 10 to 15 minutes.
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An array of individual solar roof panels 1800 are arranged in rows and columns on a roof. Each individual solar panel has a positive conductor and a negative conductor as shown in
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Conventional roof tile dimensions from different manufacturers vary. The height and width of the solar panel embodiments disclosed herein may be selected to match the size of roof tile. A minimum length and width of each panel is calculated to produce a minimum of 10 Watts each at peak sunlight, and is dependent on the available area of the roof tile. Most known roof tile areas will achieve this minimum power output. Larger sized roof tiles allow the solar cell area to be increased, achieving a greater power output.
Each solar panel contains a diode on the positive circuit of its printed circuit board. Each solar tile is fitted to a roof using a known roofing method. The solar tiles are wired together in series to form a solar array. The solar array is connected through a combiner box and to an inverter.
The output of the solar array is dependent on the D.C. voltage range demanded by the inverter. The voltage is controlled by limiting the number of solar tiles wired in series. Each series or row of solar tiles has two final contact wires which are combined together through a suitable fuse to a positive and negative bus bar to form a parallel circuit with one positive and one negative output. These outputs are wired to an inverter.
Each solar cell within the solar panel is protected by an electrical diode within the series circuitry to minimize the effect of “shadowing” for example as the incident light on the solar cells vary due to cloud movements. If one solar cell is shadowed, its performance is reduced without affecting the performance of any adjacent solar cell. Similarly, if one solar panel is shaded by for example a tree, then its performance may be reduced compared to an adjacent solar panel which is in full sunlight. Due to the serial diodes, the shading of one solar cell does not affect the performance of adjacent solar cells.
The embodiments disclosed herein can be fitted to new or replacement roofs. Any individual failed solar panel is easily replaceable by a new solar roof tile.
Claims
1-28. (canceled)
29. A photovoltaic solar roof tile assembly comprising:
- a roof tile having a front and a rear surface and a single hole extending through the tile; and
- a structure attached to the front surface of the roof tile, the structure comprising at least one photovoltaic solar cell, the structure which in operation provides a single positive output and a single negative output, the positive output connected to a positive conductor and the negative output connected to a negative conductor, wherein the positive conductor and the negative conductor extend from the structure attached to the front surface of the roof tile, through the hole of the roof tile to the rear surface of the roof tile.
30. The photovoltaic solar roof tile assembly of claim 29, wherein the structure attached to the front surface of the roof tile is a laminated structure.
31. The photovoltaic solar roof tile assembly of claim 30, wherein the laminated structure includes a printed circuit board, a first layer covering at least a surface of the printed circuit board, a second layer covering the at least one photovoltaic solar cell, and a front sheet covering a front face of the second layer.
32. The photovoltaic solar roof tile assembly of claim 31, wherein at least one of the first layer and the second layer includes ethylene-vinyl acetate (EVA).
33. The photovoltaic solar roof tile assembly of claim 31, wherein the front sheet includes a layer of ethylene tetrafluoroethylene (ETFE).
34. The photovoltaic solar roof tile assembly of claim 29, wherein the structure includes a printed circuit board, the at least one photovoltaic solar cell is electrically connected to the printed circuit board, and the positive conductor and the negative conductor extend from the printed circuit board through the hole of the roof tile to the rear surface of the roof tile.
35. The photovoltaic solar roof tile assembly of claim 29, further comprising a junction box housing a diode connected to the positive conductor.
36. The photovoltaic solar roof tile assembly of claim 35, wherein the diode is a 1000 dcV diode.
37. The photovoltaic solar roof tile assembly of claim 36, wherein the junction box is permanently sealed to the structure.
38. The photovoltaic solar roof tile assembly of claim 29, further comprising a female plug located in the hole of the roof tile, the female plug operable to receive a male plug connector.
39. The photovoltaic solar roof tile assembly of claim 29, wherein each photovoltaic solar cell of the at least one photovoltaic solar cell includes a respective plurality of monocrystalline solar wafers.
40. The photovoltaic solar roof tile assembly of claim 29, wherein the at least one photovoltaic solar cell includes a plurality of photovoltaic solar cells, the plurality of photovoltaic solar cells connected together in series.
41. The photovoltaic solar roof tile assembly of claim 40, wherein the plurality of photovoltaic solar cells are connected together in a bank of rows by one or more aluminum strips.
42. The photovoltaic solar roof tile assembly of claim 41, further comprising electrical tape and a layer of ethylene-vinyl acetate (EVA), wherein the electrical tape and the layer of ethylene-vinyl acetate (EVA) cover the one or more aluminum strips.
43. A method of manufacturing a photovoltaic solar roof tile assembly comprising:
- providing a roof tile having a front surface and a rear surface;
- forming a single hole through the roof tile, the hole extending from the front surface to the rear surface;
- attaching a structure to the front surface of the roof tile, the structure comprising at least one photovoltaic solar cell, the structure which in operation provides a single positive output and a single negative output, the positive output connected to a positive conductor and the negative output connected to a negative conductor, wherein the positive conductor and the negative conductor are extended from the structure attached to the front surface of the roof tile, through the hole of the roof tile to the rear surface of the roof tile.
44. The method of claim 43, wherein providing a roof tile having a front surface and a rear surface includes providing a roof tile that includes at least one of concrete, cement, clay, plastic, and metal.
45. The method of claim 43, wherein attaching a structure to the front surface of the roof tile includes attaching a laminated structure to the front surface of the roof tile.
46. The photovoltaic solar roof tile assembly of claim 43, wherein attaching a structure to the front surface of the roof tile includes attaching a structure that includes a printed circuit board, the at least one photovoltaic solar cell electrically connected to the printed circuit board, and the positive conductor and the negative conductor extending from the printed circuit board through the hole of the roof tile to the rear surface of the roof tile.
47. The photovoltaic solar roof tile assembly of claim 43, further comprising locating a junction box in the hole of the roof tile, the junction box housing a diode connected to the positive conductor.
48. The method of claim 47, wherein locating a junction box in the hole of the roof tile includes permanently sealing the junction box to the structure.
Type: Application
Filed: Mar 5, 2019
Publication Date: Jun 27, 2019
Inventors: Paul Julian CROPPER (Vancouver), David Allan STIRLING (Vancouver)
Application Number: 16/292,523