How much is the service life of the solar street light years

Solar street light pole in 15 years to life for 50 years, if the zinc plating of good, the use of more than 30 years is not a problem, the service life of the solar panels for 15 years, the average to the cost is much lower than normal mains electricity every year, and the service life of LED light source for 50000 hours, if the lighting for 12 hours a day, can use the 13 years if lighting six hours a day can be used for more than 20 years, so we don't need to consider other parts service life of the solar street lamps, as long as you consider replace the battery every 3 years to 5 years to (solar street lamp manufacturers provide battery is much lower than the cost of electricity cost)
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