|| The aim of this course is to discuss three individual topics of more specialized nature: large PV systems, photo-voltaic under concentrated sunlight and the hydrogen economy. After completing this course the students should be able to: 1. Understand the specific features of large PV systems,an examine their economic and technical characteristics. 2. Explain the advantages and disadvantages of concentrator PV systems, and discuss their operation. 3. Analyze the structure of the hydrogen economic and show its feasibility and future potential.