Abstract: A photovoltaic system including a PV module or a number of modules held by a mount consisting of two vertical posts anchored to the ground and two hinges from both sides of the PV module, such hinges providing a pivot for free rotation of the PV module, which is located above the center of mass of the PV module. The rotation of the PV module around the pivot under wind loads significantly reduces the load applied to the mount, thus significantly reducing its manufacturing and installation cost. Using such flapping mount with bifacial PV modules supports the wider use of vertically mounted PV modules.