This PV grid-connected system shall be interconnected to the Metropolitan Electricity Authority (MEA) distribution line of 24 kV under the regulation on the Synchronization of Generators to the Power Utility System of MEA there is no need for storage batteries. It operates in parallel with the main electrical grid and stores the produced electricity to the grid. The building roof area is 14,000 m2; with 16 degree azimuth, 3 degrees face East and 3 degree face West pitch (Fig. 1). The PV generators shall be installed on top of the roof (Alu-zinc roof sheet), which proper direction facing in order to achieve the maximum electricity production and to be possible for engineering installation and be architecturally pleasant. Special attention was paid not only to the technical characteristics of the pV generators, such as high performance and reliability, but also to their color appearance after their interaction with solar radiation. The PV system is connected in a three-phase mode to the electricity grid and consists of at least 350 kWp PV generators, sinusoidal interconnected inverters and a control board for system parameter control and monitoring via a data recorder. The recorder has the ability to store data produced from various measurements. The block diagram of the PV grid-connected system shall be installed as shown in Fig. 2.