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The present invention relates particularly to photovoltaic systems for use in photovoltaically generating electrical energy. One aspect of the invention is a photovoltaic roofing system disposed on a roof deck. The photovoltaic roofing system includes one or more photovoltaic elements contiguously d

The present invention relates particularly to photovoltaic systems for use in photovoltaically generating electrical energy. One aspect of the invention is a photovoltaic roofing system disposed on a roof deck. The photovoltaic roofing system includes one or more photovoltaic elements contiguously disposed on the roof deck, the contiguously-disposed photovoltaic elements defining a photovoltaic area; a plurality of roofing elements disposed adjacent the contiguously-disposed photovoltaic elements, along their side edges; side flashing disposed along the side edges of the contiguously-disposed photovoltaic elements, the side flashing having a cross-sectional shape comprising a vertically-extending feature and a flange extending from each lateral side at the bottom of the vertically-extending feature, with the flange facing the photovoltaic area being at least partially disposed between a photovoltaic element and the roof deck, and the flange facing away from the photovoltaic area being at least partially disposed between a roofing element and the roof deck.

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1. A photovoltaic roofing system disposed on a roof deck having an upper end and a lower end, the photovoltaic roofing system comprising: one or more photovoltaic elements contiguously disposed directly on the roof deck, the one or more contiguously-disposed photovoltaic elements together having a t

1. A photovoltaic roofing system disposed on a roof deck having an upper end and a lower end, the photovoltaic roofing system comprising: one or more photovoltaic elements contiguously disposed directly on the roof deck, the one or more contiguously-disposed photovoltaic elements together having a top edge facing the upper end of the roof deck, a bottom edge facing the lower end of the roof deck, and two side edges, the one or more contiguously-disposed photovoltaic elements defining a photovoltaic area;a plurality of roofing elements disposed adjacent the one or more contiguously-disposed photovoltaic elements, along the side edges of the one or more contiguously-disposed photovoltaic elements;side flashing disposed along each of the side edges of the one or more contiguously-disposed photovoltaic elements, each side flashing having a cross-sectional shape comprising a vertically-extending feature and a flange extending from each lateral side at a bottom of the vertically-extending feature, with the flange facing the photovoltaic area being at least partially disposed between at least one of the one or more photovoltaic elements and the roof deck but not extending under substantially the entire photovoltaic area, and the flange facing away from the photovoltaic area being at least partially disposed between a roofing element and the roof deck, wherein one or more of the side flashings includes a hemmed return. 2. The photovoltaic roofing system according to claim 1, wherein at least one of the one or more photovoltaic elements is adhered to the photovoltaic area-facing flange of the side flashing by an adhesive on a bottom surface of the at least one photovoltaic element. 3. The photovoltaic roofing system according to claim 1, wherein the roofing elements are bituminous shingles. 4. The photovoltaic roofing system according to claim 1, wherein one or more of the flanges of the flashings have flexible portions. 5. The photovoltaic roofing system according to claim 1, wherein the side flashings include a recessed insertion area formed in a side of the vertically-extending feature, and one or more of the roofing elements are at least partially disposed in the recessed insertion area. 6. The photovoltaic roofing system according to claim 1, wherein at least one of the side flashings is provided as one or more continuous pieces of flashing on a side facing the one or more photovoltaic elements, and a plurality of stepped side flashing pieces on a side facing the roofing elements. 7. The photovoltaic roofing system according to claim 1, further comprising a roofing element disposed along the bottom edge of the photovoltaic area and a bottom flashing disposed along the bottom edge of the photovoltaic area, disposed at least partially underneath at least one of the one or more photovoltaic elements and at least partially on top of the roofing element disposed along the bottom edge of the photovoltaic area. 8. The photovoltaic roofing system according to claim 7, wherein the bottom flashing has a cross-sectional shape comprising a vertically-extending feature and a flange extending from each lateral side at a bottom of the vertically-extending feature, with the flange facing the photovoltaic area being disposed at least partially underneath at least one of the one or more photovoltaic elements, and the flange facing away from the photovoltaic area being disposed at least partially on top of the roofing element disposed along the bottom edge of the photovoltaic area. 9. The photovoltaic roofing system according to claim 1, further comprising a roofing element disposed along the top edge of the photovoltaic area and a top flashing disposed along the top edge of the photovoltaic area, the top flashing disposed at least partially under the roofing element disposed along the top edge of the photovoltaic area, and at least partially over the one or more photovoltaic elements. 10. The photovoltaic roofing system according to claim 9, wherein the top flashing includes one or more cavities, one or more recesses, or one or more cavities and one or more recesses that act as a cover, a conduit, or both a cover and a conduit for electrical features protruding from a surface of the one or more photovoltaic elements at the top edges of the one or more photovoltaic elements. 11. The photovoltaic roofing system according to claim 1, wherein a plurality of the photovoltaic elements are disposed in the photovoltaic area. 12. The photovoltaic roofing system according to claim 11, further comprising flashing disposed at interfaces between adjacent contiguously disposed photovoltaic elements. 13. The photovoltaic roofing system according to claim 11, wherein the plurality of photovoltaic elements is a linear array of strip-shaped photovoltaic elements, and the photovoltaic roofing system further comprises standing seam flashing, the standing seam flashing having a cross-sectional shape comprising a vertically extending feature, and two flanges, one extending laterally from each side at the bottom of the vertically extending feature, wherein the standing seam flashing is disposed at each interface between contiguously disposed photovoltaic elements, with each flange being disposed between one of the contiguously disposed photovoltaic elements and the roof deck. 14. The photovoltaic roofing system according to claim 1, wherein at least one of the side flashings includes a recessed insertion area formed in the vertically-extending feature, overhanging at least one of the flanges. 15. The photovoltaic roofing system according to claim 14, wherein at least one of the plurality of roofing elements is disposed in the recessed insertion area. 16. The photovoltaic roofing system according to claim 14, wherein at least one of the one or more photovoltaic elements is disposed in the recessed insertion area. 17. A method for installing a photovoltaic roofing system according to claim 1 onto a roof comprising a roof deck having an upper end and a lower end, the method comprising disposing the side flashing along the side edges of the photovoltaic area, the side flashing having a cross-sectional shape comprising a vertically-extending feature and a flange extending from each lateral side at the bottom of the vertically-extending feature, with the flange facing away from the photovoltaic area being at least partially disposed between a roofing element disposed along the side edges of the photovoltaic area and the roof deck; andcontiguously disposing the one or more photovoltaic elements directly on the roof deck in the photovoltaic area, with the flange of the side flashing facing the photovoltaic area being at least partially disposed between a photovoltaic element and the roof deck. 18. The method according to claim 17, wherein the roof further comprises roofing elements arrayed on the roof deck, the method further comprising, before performing the disposing steps, removing a plurality of roofing elements disposed within an area surrounding the photovoltaic area.