Mechanical clips and pier cap assemblies are provided that may be used to construct solar panel mounting frames. The assemblies include a pier cap that is configured to be attached to a top portion of a pier, which includes an opening and a flange stop. The flange stop is configured to support a solar panel mounting frame member. The assemblies further include a clip that has an aperture and a tab, with the tab being configured to be disposed through the opening in the pier cap. The assemblies further include a bolt and a nut, which are used to secure a solar panel mounting frame member to the pier cap.