The example is certain real estates development project of 5KM long and 20M wide road in Shanghai and it needs to install auxiliary road lamp. If the space of two lamps is 40M and it uses symmetric lamp arrangement of both sides; it will need 250 lamps. Common lamp price is RMB 8000/set and each lamp post sets up one checking well. Whereas, solar energy price is RMB 19500/set and it analyzes and compares per service life of 15 years
| Lamps and lanterns category Contrast project |
Solar energy lamps and lanterns |
Ordinary lamps and lanterns |
| Lamps and lanterns price |
19500 x 250=4875000 (4.875million) |
8000 x 250=2000000 (2 million) |
| Installment expense |
400 x 250=100000 (100,000) |
2000000 x 10%=200000 (200,000) |
| Necessary expense |
Does not have |
1,Buries the electric cable: 35 x 40 x 250=350000 (350,000) 2,Trenching backfill: 15 x 40 x 250=150000 (150,000) 3,100 mm woven tube: 25 x 40 x 250=250000 (250,000) 4,Inspection well: 300 x 250=75000 (75,000) 5,The switching equipment (switch, timer, file protect, engine case, electric power increase, erects power transformer and so on) each to divide equally 3,000 Yuan 3000 x 250=750000 (750,000) Grand total: 1.575 million Yuan |
| Maintenance cost |
Accumulator cell replacement:1500 x 250=375000 (375,000) |
The lamp source is the 500W sodium lamp, every day works for 8 hours every day then consumes the electricity is 4, according to each electricity 1 Yuan computation, then 15 years altogether consume the electrical bill are: 4 x 250 x 365 x 15 x 1=5.475 million Yuan Maintenance cost: Lamp source 70 Yuan x 8 x 250=14 ten thousand Yuan ,In addition also includes the control system the unit replacement, and special management power transmission personnel¡¯s expense idea and so on wages is 100,000 Yuan (counts 5715000) |
| Security performance |
Working voltage for direct current 12V, 24V, absolutely safe, the performance is stable, cannot occur receives an electric shock the accident |
The working voltage for exchanges 220V, can be stable, must year to year maintain. But exists meets the flooding disaster and cloudy is easy to have the leakage to perish the human accident. At the same time easily power cut, limits power consumption the influence. |
| The expense equals |
497.5+37.5= 5.35 million Yuan |
377.5+571.5= 9.49 million Yuan |
relatively safe, performance is comparatively stable and it needs maintenance all year round. It also has risk of accident in flood disaster and cloudy days. It is easily affected by such factor as power shut down to disturb normal usage. Along with the shortage of energy and electric power supply in our country, such situation may be more prominent in the future.
In a word, solar lamp saves investment and is high in performance price ratio. The usage of green, environment protection and renewable energy is of all at once investment with long term benefit. In such lighting project as city plaza, beach bathhouse and top grade villa, solar energy lamp will be the priority choice favored by investors.
Published in2007-11-4 |
