The present invention provides photovoltaic wiring arrays and photovoltaic wiring systems suitable for use in rooftop photovoltaic power generation systems. Accordingly, one aspect of the invention provides a photovoltaic roofing wiring array for use with a plurality of photovoltaic roofing elements, each photovoltaic roofing element having a positive lead terminated in a positive connector and a negative lead terminated in a negative connector, and a lead-to-lead distance between the positive connector and the negative connector, the photovoltaic roofing wiring system comprising: a positive parallel wiring run, the positive parallel wiring run comprising a main line and one or more connection branches pendant from the main line, each connection branch being terminated in a positive connector; and a negative parallel wiring run, the negative parallel wiring run comprising a main line and one or more connection branches pendant from the main line, each connection branch being terminated in a negative connector, wherein each positive connector is coupleable to the positive connectors of the photovoltaic roofing elements; and wherein each negative connector is coupleable to the negative connectors of the photovoltaic roofing elements. In some embodiments of the invention, the photovoltaic roofing wiring arrays are substantially prefabricated.