Abstract: Many PV panel frames are attached to PV panel mounting structures with through-bolting mechanisms. These PV panel frames subjected to high internal stresses around the through-bolting mechanism making them susceptible to fatigue failures. The introduction of a custom backing plate to the through-bolting mechanism can reduce PV panel frame fatigue failure when compared to the state of the art in the current through-bolting mechanism design. The custom backing plate is tuned in shape and thickness to reduce PV panel frame fatigue failure. In addition to reducing total fatigue stresses in the PV frame, the disclosed technology increases peak load rating of the PV panel frame.