In the long run, the cost of
solar cat eye road studs is lower. The initial investment of solar cat eye road studs in urban road lighting is relatively large. But the advantage is that there is no need for the municipal grid to supply electricity. However, the initial investment of high pressure sodium lamp for road lighting is relatively small. However, the high-pressure sodium lamp needs to continuously consume the power supplied by the municipal power grid. In addition, the service life of the ballast is limited, so it needs to be replaced and maintained, and the later cost is high.
The
service life of solar cat eye road studs can reach 70000 hours, which is six times longer than that of high pressure sodium lamp. If lighting 10 hours a day, solar cat eye road studs can be used for 20 years, while high-pressure sodium lamps can only be used for less than three years. During the service life of solar cat eye road stud, the battery needs to be replaced 5 times (once every 4 years, the unit price is 680 yuan / piece), and the high-pressure sodium bulb and ballast need to be replaced 7 times (each time the labor and machinery cost is 200 yuan).
This may not highlight the cost advantage of solar cat eye road stud. Then let’s see the energy saving costs by using solar power.
The solar cat eye road stud in the solid waste treatment center is illuminated for 10 hours every day. Based on 365 days per year, 133 sets of 180W (including ballast loss of 30W) high pressure sodium lamp and 43 sets of 120W (including ballast loss of 20W) sodium lamp can save 106200 KWh a year. The life span of solar cat eye road studs is 20 years. The total energy saving of solar cat eye road stud is 2124300 KWh.
Calculated according to the electricity price of 0.9 yuan / KWh, solar cat eye road studs can save 95600 yuan in one year. Compared with the investment cost, the cost of solar cat eye road studs is 804400 yuan (including the cost of battery replacement). After deducting the excess expenditure, the actual savings of 2.707 million yuan in 20 years.
