The invention relates to enclosed solar parabolic trough reflector systems for thermal heat generation that can ultimately be used in various applications. The system includes a modular dual arch building design with a transparent building envelope and a reflector assembly connected within the building through a bearing assembly. The system is particularly suited for solar heat collection in harsh environment.

A header for photovoltaic module support system and a photovoltatic module support system is disclosed. In various embodiments the header includes a beam and a plurality of strongback mounting tabs attached to the beam, each of the plurality of strongback mounting tabs attached to the beam such that the mounting tabs have an upward face that is mounted generally flush with an upward surface of the beam such that the upward face of the mounting tab and the upward surface of the beam define a support surface for an attachable strongback. In various embodiments the header includes a standoff and stabilizing rod attached to a downward surface of the beam, the stabilizing rod having a first end and second end attached to the downward surface of the beam with a main body that extends lengthwise with the beam and radially outward over the standoff.