Solar LED Street Lights

Solar LED street light is made up of four parts: solar panel, controller, battery and light. Solar power and LED technic are the best combination for solar lights.

Solar led street light
Sketch map of the Solar LED street light

Analysis on economic benefit and social benefit of Solar LED street light and normal high voltage sodium lamp.
The compare is under following statements:
The estimated construction of street light project includes 150 pieces lamps, design services life of 10 years, average lighting time is 8 hours each day, electricity rate is RMB0.5/KWH.    

Economic benefit

 

 

High voltage sodium lamp

Solar LED street light

Item

Quantity

Unit price(RMB)

Sum

Unit price

Sum

Lamps

150pcs

1500

225000

15000

2250000

Expense of high voltage cable material

150sets
(30m/1set)

260

2700000

0

0

Expense of low voltage cable material

150sets
(50m/1set)

3.5

26000

300

45000

10KV transformer box

4sets

20000.0

80000

0

0

Street lamp controller

1pieces

6000

6000

 

 

civil engineering

150sets

1200

180000

 

 

Expense of basic installation

150sets

1000

150000

1000

150000

Storage battery

150sets

0

0

 

 

Initial investment

 

226.7 x 10000

 

244.5 x10000

10years electric charge

300W x 10h x 3650days x 150pcs x0.5/1000 = 820000

0

0

Maintenance cost

RMB150 x 10 years x 150pcs = 225000

0

0

Wastage of lights

RMB1500 x 150pcs = 225000

RMB1000 x 150pcs = 150000

10years extra cost

 

127x10000

 

15 x10000

10years total

RMB353.7 x1000

RMB259.5x10000

 

 

 

Social benefit

10 years with solar led lights these project will save 656 tons coal( according to 400g/KWH), means the reduction of emissions: SO2 31.6tons, CO2 486tons, NO2 23.6tons, CO 0.5tons, impurity and powder 276tons.

Relative to sodium lamp, solar led lamp has more advantages:

Item

High voltage sodium lamp

LED lamp

Environmental protection

Include Hg,  ultra-violet radiation

LED is green light source,

Life

Normal 3000hours, Philips can reach 3000-4000hours

Real life can be more than 50000hours

Light decay

1 year 40%

10years 30%

Color rendering index

About 20

>80

Luminous efficiency

About 40%

About 90%

Starting time

5-10minutes

immediately

Power supply system

Needs Transformer

Special drive module

In order to fit the local actual situation, for a quotation we need following informations:

- Height of lamp pole?

- Power of LED lights or Luminosity of the center point?

- How many days should the lamp works in cloudy or rainy days?

- How many hours works the lamp(6hour, 8hours or 10hours)?

- If full bright / half bright can be acceptable?( e.g. from 18:00- 24:00 full bright, from 0:00-05:00 half bright)

- the local climatic conditions ? 

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