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 The photovoltaic system we provide is certified by the authority and is in accordance with the national standard. The refractive index of the photovoltaic system is not less than 80% in 25 years. A 5KW household uses a PV power plant that needs a roof area of about 30 square meters, and needs to invest 3~4 million yuan, making about 7300 kilowatt hours a year. The full access to the Internet, the state's acquisition of electricity price is about 6000 yuan real income a year, and it will recover the investment cost in about 5 years, plus 20 years of national subsidy, and one-time investment will benefit for life.