An assembly which is lightweight includes an interconnected array of PV modules, where each PV modules is defined in part by a module outer perimeter portion. This array is defined in part by an outer perimeter portion including an upper edge portion, side edge portions, and a lower edge portion. The array is secured to a sloped roof along at least one of the upper or lower edge portion of the array. The assembly further includes interlocking features along the module outer perimeter portion which distribute uplift forces to adjacent PV modules. Additionally included is at least one wind deflector located along the lower edge of the array and non-penetrating base feet disposed on the sloped roof supporting at least a portion of the array.
 The invention described herein was made with government support under contract number DE-FC36-07GO17043 awarded by the United States Department of Energy. The United States Government may have certain rights in the invention.