Abstract: A photovoltaic (“PV”) module support system including a first PV module having a first PV panel adapted to generate electrical energy from sunlight. The first PV panel has an upper surface and a lower surface and a first frame secured to the lower surface of the first PV panel. The first frame having a pair of first frame members including an elongate slot. A first joining rail has a body and a first wall projecting outwardly from the body. The first wall is inserted within the elongate slot of one of the pair of the first frame members. A fastener is connected to the one of the pair of first frame members and movable to clamp the wall within the slot, wherein the first PV module is positionally fixed relative to the joining rail.