Abstract: Provided is a support assembly for mounting an array of photovoltaic panels to a support surface such as the ground. According to the invention, there is provided a plurality of front and rear support posts, each post having an anchor portion to be driven into the support surface and a leg portion which is nested therein and longitudinally adjustable to raise or lower corresponding front and rear horizontal supports. Photovoltaic panels are mounted lengthwise across the horizontal supports in a predetermined position to minimize the stress thereon caused by wind load. The horizontal supports further comprise wiring raceways to support wiring harnesses originating from the photovoltaic panels and terminating at the end of each row of photovoltaic panels in the array.