Photovoltaic roofing structure
A photovoltaic roofing system includes front surface electrical connections and can be installed utilizing conventional tools and techniques. The system includes particularly configured photovoltaic power generating roofing shingles which provide for linearly aligned electrical terminals when installed. The system may be used in conjunction with a protective cap which shields the connections.
1. A photovoltaic shingle system comprising:
A. a plurality of pairs of shingle strips, each pair including a first and a second member, each of said first and second members comprising an elongated strip having a length dimension L greater than a width dimension W, each member comprising:
i. a photovoltaic generating portion extending along said length dimension L, said photovoltaic generating portion having a width which is less than said width dimension W, said photovoltaic generating portion including:
a plurality of tabs defined thereupon, each tab having a width which is equal to the width of said photovoltaic generating portion, and a length which is less than said length dimension L;
at least one photovoltaic device which is operative to generate a flow of electrical current in response to the absorption of illumination thereby;
an interconnect region defined therein, said interconnect region having a width which is equal to the width of said photovoltaic generating portion, and a length which is less than the length of any one of said tabs;
a pair of electrical terminals which are disposed in said interconnect region and which are in electrical communication with said at least one photovoltaic device, said terminals being operative to provide for the collection of said flow of electrical current generated by said at least one photovoltaic device;
ii. an overlap portion having a length equal to said length dimension L and a width which is less than said width dimension W;
wherein the interconnect region of said first member of said pair of strips is spaced from a first end of said strip by a distance which is different from a distance that the interconnect region of the second member of said pair is spaced from the corresponding end of said second member, whereby when said first member of said pair and said second member of said pair are disposed in an overlapping relationship such that said first member of said pair overlies said second member of said pair so as to cover at least a part of the overlap portion of said second member of said pair, and when the tabs of said first member of said pair, and the tabs of said second member of said pair are disposed in a staggered relationship, the interconnect region of said first member of said pair, and the interconnect region of said second member of said pair will be aligned;
B. an electrical connector for establishing electrical connection between the electrical terminals of said members of said plurality of pairs of shingle strips; and
C. a protective cap configured to overlie the aligned interconnect regions and to cover said electrical connector.
2. The photovoltaic roofing system of claim 1 , wherein said tabs are defined by embossments in said photovoltaic generating portion.
3. The photovoltaic roofing system of claim 1 , wherein said tabs are defined by notches cut through said photovoltaic generating portion.
4. The photovoltaic roofing system of claim 1 , further including retainer clips for affixing said cap to a roofing structure.
5. The photovoltaic roofing system of claim 1 , wherein said at least one photovoltaic device comprises a thin film photovoltaic device.