'Photovoltaic (pv) of the world' this is a comprehensive system to introduce photovoltaic summary of past, present and future of the development of corpus, solar controller which good wide-ranging, solar controller which good company cost control scheme can meet the needs of different readers. Steam thermal storage in this paper, not only including the editor Wolfgang & middot; Dr Parr, herself, in its more than 50 years of the new energy career should deal with solar energy photovoltaic power generation project for the deep understanding of the development of photovoltaic (pv) and the system summary, the largest wind turbine cost also includes the global photovoltaic industry professionals engaged in new energy or a review of the photovoltaic difficult development, steam thermal storage