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日本在家用太阳能发电的研究方面有所进展，其设施已商业化，可供住户铺于房顶。夏普公司开发的住宅太阳能发电系统， 26.9 m2光电池板功率达 4 kW，光电转换效率为 17.5％，曾获 1999年度能源大奖、通产大臣奖。 日本的住宅光电系统
Japan has made some progress in the research of solar home power generation, and its facilities have been commercialized and can be installed on the roof of households. Developed by Sharp’s residential solar power system, 26.9 m2 of photovoltaic panels power of 4 kW, photoelectric conversion efficiency of 17.5%, won the 1999 Energy Award, Minister of Industry and Minister of Award. Japan’s residential photovoltaic system