Photovoltaic roofing systems with inside corner flashings

A photovoltaic roofing system disposed on a roof deck having a top end, a bottom end, a first lateral side and a second lateral side opposing the first lateral side, the photovoltaic roofing system comprising:

• a first course comprising one or more photovoltaic roofing elements, contiguously disposed in a horizontal row on the roof deck, the one or more contiguously-disposed photovoltaic roofing elements of the first course together having a top edge facing the top end of the roof deck, a bottom edge facing the bottom end of the roof deck, a first side edge facing the first lateral side of the roof deck, and a second side edge opposing the first side edge and facing the second lateral side of the roof deck;
• a second course horizontally offset from the first course, the second course comprising one or more photovoltaic roofing elements, contiguously disposed in a horizontal row on the roof deck, the one or more contiguously disposed photovoltaic roofing elements of the second course together having a bottom edge facing the bottom end of the roof deck and at least partially overlapping the top edge of the one or more contiguously-disposed photovoltaic roofing elements of the first course, the one or more contiguously disposed photovoltaic roofing elements of the second course together having a first side edge facing the first lateral side of the roof deck, the first side edge being laterally offset from the first side edge of the one or more contiguously-disposed photovoltaic roofing elements of the first course, such that the first side edge of the one or more contiguously-disposed photovoltaic roofing elements of the second course is disposed up the roof from an interior portion of the top edge of the one or more contiguously-disposed photovoltaic roofing elements of the first course, thereby forming an inside corner between the first side edge of the one or more contiguously-disposed photovoltaic roofing elements of the second course and the interior portion of the top edge of the one or more contiguously-disposed photovoltaic roofing elements of the first course;
• and a second side edge opposing the first side edge and facing the second lateral side of the roof deck;
• an inside corner flashing element having a top edge, a first horizontal portion having a first side edge facing the second lateral side of the roof deck and a bottom edge, a second horizontal portion horizontally adjacent the first horizontal portion, the second horizontal portion having a second side edge opposing the first side edge of the first horizontal portion and facing the first lateral side of the roof deck, and a bottom edge adjacent the bottom edge of the first horizontal portion, the second horizontal portion having a height with respect to the roof deck, the height being tapered along a direction from its bottom edge toward its top edge with the height being less towards the top edge than it is towards the bottom edge, the first horizontal portion comprising a horizontally-extending flange forming a water-resistant interface with the photovoltaic roofing element at the first side edge of the one or more contiguously-disposed photovoltaic roofing elements of the second course, the second horizontal portion overlapping the top edge of a photovoltaic roofing element of the first course at an interior portion of the top edge of the one or more contiguously-disposed photovoltaic roofing elements of the first course;
• and
• an inactive roofing element disposed adjacent the first side edge of the second course and on top of the second horizontal portion of the inside corner flashing element.