A photovoltaic module mounting assembly (200) uses a mounting device (74), mounting plate (110′), lower bracket (210), upper bracket (230), and stud (114). The mounting plate (110′) is positioned on the mounting device (74), and a leg (212) of the lower bracket (210) is positioned on the mounting plate (110′). An outside surface (222) of another leg (220) of the lower bracket (210) includes teeth (224) and engages an inside surface (238) of a leg (236) of the upper bracket (230), which also has teeth (240). The mounting plate (110′) engages a lower surface (63) of a photovoltaic module (58), an end of the leg (212) of the lower bracket (210) may engage a side surface (64) of the module (58), and a head (246) on an end of another leg (232) of the upper bracket (230) may engage an upper surface (65) of the module (58).