[14p-P13-1~10] 1.4 Energy conversion, storage, resources and environment

[14p-P13-1] Field research of the solar power generation systems 15 years ago

〇Toshinobu Shigematsu¹, Hiroharu Kawasaki², Bunji Ono³, Kenji Nakashima², Yuuki Johno², Hideki Shimada² (1.Okayama Univ. of Sci, 2.Sasebo College, 3.Saga Univ.)

Keywords:solar power generation system, deteriorating conditions

Though data are collected from National Colleges of Technology, there are 70% National Colleges of Technology whose photovoltaic power systems still generate electricity and .preserve the data. Among them, 60% of Colleges in the reduced power. With the annual reduction rate is 3%. As for 40% of Colleges, though the systems were installed 15 years ago, the efficiency of generating electricity has not decreased.