NOVELTY - The system has fiber-reinforced concrete ballast tile (28a,28b) whose lower and upper mounting elements (30,32) are extended upwardly from top surface of ballast tile. The lower and upper mounting elements are arranged to receive lower edge (38) of photovoltaic module (26) and to secure upper edge (42) of photovoltaic module. The fiber reinforced concrete is made of alkaline-resistant glass and polymer fiber. The photovoltaic module is provided with an aluminum frame. The mounting elements are operated to position photovoltaic module horizontal.    USE - Ballast tile system for supporting photovoltaic modules integrated with flat roofs (claimed) of commercial or residential building.    ADVANTAGE - The photovoltaic modules can be installed without physically or mechanically attaching module-mounting structure to building roof and can be installed with little time and labor. The ballast tile system can be manufactured easily and inexpensively. The upper and lower mounting elements can position module at low incidence angle relative to horizontal plane to ease the cleaning of module. The system provides economical way to mount modules in lower latitude, high solar radiation regions, without need for special installation tools or procedures. The modules can be installed with minimal incremental material costs. Since the impact of being off the exact north-south axis is minimized, the system can mount modules at low incidence angle that allows flexible north-south alignment. Thus, the modules can be placed along building axes without custom design of tiling to match north-south axes. Since the modules can be placed in horizontal or near horizontal position, the highest economic value is gained by maximizing electricity output. The adequate airflow below the modules can be ensured for cooling modules. The particles such as sand or debris can be prevented from becoming trapped below modules.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of multiple photovoltaic modules installed on mounting elements.    Photovoltaic module (26)    Fiber-reinforced concrete ballast tiles (28a,28b)    Lower mounting element (30)    Upper mounting element (32)    Lower edge of photovoltaic module (38)    Upper edge of photovoltaic module (42)