Installation of street lights could have been a good thing, but too filling the electricity goes bad incident, street often strike. This does not, last August, the town of Pucheng jiumu finally unbearable high tariffs to 40 conventional solar street lights have been replaced. Previous 40 150W sodium lamp electricity would more than 20,000 yuan a year, but also the artificial maintenance, management, and solar lights do not need to connect electricity, no maintenance, can save about 30,000 yuan this year. More than ten million of costs in 2067 will be able to recover, and solar street life of up to ten years or more, such a calculation, you can also make money. "Solar lights voltage is only 12V, the absolute security; use of LED lighting, the brightness is 10 times the previous incandescent; power control can be adjusted when coupled with light control, sufficient to meet the different time periods, the weather needs; and when the installation does not require on the road 'disembowelling', there is no wire affect appearance; even in rainy weather, it is also through the internal battery discharge, keep lights work ...... "Speaking of the advantages of solar lights, San Yuan Yang Dong rattle engineers . "In fact, just to build a photovoltaic power plant investments, even higher than the average return on investment." Du Yungui said. Originally, photovoltaic power plants can be sent to the electricity sold to the state, you can also get the subsidy policy. San Yuan's wish to adopt photovoltaic power plant to calculate this "investment." San Yuan PV power plant is 6.5 kilowatts of power, the whole project cost about 65,000 yuan, and there is no post-maintenance costs. Power plant generating about 7000 kwh per year, according to state regulations provisional, these national grid electricity sold to the state, count tariff and subsidy, San Yuan can get 1 yuan per kilowatt-hour earnings, which is holy element can annually get 7000 yuan gains. According to such a calculation, you need only nine years to recover the cost. Effective life of the power station for 25 years, yields of up to nearly 300%. Convenient and more practical