After a brief introduction to the topic of photovoltaics history and the most important facts, Chapter 2 presents the subject of radiation, covering properties of solar radiation, radiation offer, and world energy consumption. Chapter 3 looks at the fundamentals of semiconductor physics. It discusses the build-up of semiconductors, band model of semiconductors, charge transport in semiconductors, doping in semiconductors, the pn-junction, and the interaction of light with semiconductors. Chapter 4 considers the structure and functioning of the solar cell, by covering mode of operation, electrical description of real solar cells, and high efficiency cells. The next chapter presents cell technologies - the manufacture of crystalline silicon cells and amorphous silicon. It looks at other thin film cells, hybrid wafer cells, and finally concentrator systems. In the middle of the book, solar modules and solar generators are discussed. Subjects covered here include properties of solar modules, the interconnection of solar modules, DC-components, and types of PV-plants. Chapter 7 overviews system technology of grid connected plants, including solar generator and load, and build-up of grid-connected systems. Chapter 8 covers the storage of solar energy before Chapter 9 overviews photovoltaic measurement technology. Towards the end of the book, the planning and operation of grid-connected systems are described. Readers can learn about the economic efficiency of PV systems here, as well as see operation results of concrete plants. The final chapter looks to the future development of PV, including efficient promotion instruments and price and feed-in tariffs development. The last section provides exercises and a useful appendix.