Abstract: An apparatus, system, and method for attaching a solar panel to a purlin is disclosed, the solar panel further including a frame having a set of frame holes. The apparatus includes a solar panel clip including a solar panel clip bearing surface, a key formed on the solar panel clip bearing surface, a perpendicular locking surface coupled to the solar panel clip bearing surface, and an upper solar panel spacing section configured to provide an expansion joint. The apparatus also may include a solar panel clip washer mount. A solar panel is positioned on the solar panel clip bearing surface and is secured to the purlin.