A frame system is disclosed for supporting photovoltaic (PV) panels on a support surface. The frame system may make use of a plurality of frame rails, with each frame rail forming a single piece component having a channel formed therein. Each frame rail may have a first portion and a second portion extending non-parallel to the first portion. The system may also include a plurality of ballast trays for securing to the frame rails. Each ballast tray may have a floor portion being of dimensions adapted to support a predetermined ballast weight thereon, and a connecting bracket secured to the floor portion. The connecting bracket may define a plurality of locations thereon at which end portions of a pair of the frame rails may be connected to the connecting bracket. The connecting bracket enables a degree of adjustable spacing to be provided between adjacent rows of frame rails connected to the connecting bracket.