Abstract: A photovoltaic membrane system is provided for use on a building and, optionally, incorporated into the building envelope. One or more photovoltaic cells are provided at an upper layer of the system. A thermal barrier is disposed between the one or more photovoltaic cells and the building, isolating the two from one another. The thermal barrier may be provided as a series of wedges that are shaped and oriented to optimize electrical performance of the photovoltaic cells. An air channel assembly may be provided to ventilate heated air from beneath the one or more photovoltaic modules away from the system and the building. The system may be integrally associated with the building or removably coupled therewith. Components may be provided for assembly during installation or preassembled modules may be provided for installation.