Abstract: A photovoltaic (PV) module mounting system comprises a plurality of PV modules, support brackets disposed under the modules and a ballast frame disposed under and attached to the support brackets. The ballast frame is supported on conventional building rooftops and attached thereto by conventional methods. The support bracket consists of front and rear supports, which can be adjusted to alter the desired tilt angles of the overlying PV modules. The ballast frames can be adjusted to varying widths and lengths. The system is effective in reducing the net effect of wind uplift force when modules are mounted on building rooftops. Additionally, the system provides the advantage of ease of use with less components and minimal roofing penetrations.