The problems of access to electricity continue to arise from billions of people living on the planet, mainly in the rural zones of the developing countries. The needs expressed by these populations concerned in priority with small amounts of energy for lighting, pumping water, education, culture, health, agriculture and handicrafts. The economic calculations from the companies of electricity show that they have no interest in distribution of energy where the investment and costs of production are important, for a market where consumers are poor, dispersed, with a low overall energy demand. At a time when the debates are focused on issues of sustainable development, solar energy becomes a door exit, it becomes a bridge for many desperate people. This book is an undeniable tool for the dimensioning and maintenance of photovoltaic solar installations.