ABSTRACT
In the first 25 years in the terrestrial Photovoltaic (PV) utilization, practically all of the systems were the “standalone” applications. The resulting mass production caused substantial reduction in the price, which started a “PV rush.” The 333 roof-mounted PV systems indicated that the generation of electricity in decentralized PV systems and connecting them to the utility grid was feasible, but to extend clever promotion on a large scale would need financial support until the mass production brought the price of PV systems down. PV systems either can have a fixed orientation or can incorporate mechanisms to track the sun. There are two fundamentally different types of PV tracking systems: single-axis, which follow the sun’s path from east to west typically with a fixed or seasonally adjusted elevation angle, and dual-axis trackers, which follow the sun in both altitude and azimuth.
