The cost accounting for lighting engineering primarily consists of three major components: installation costs, operating costs, and maintenance costs. The price of the products largely depends on the brightness and style of the lighting. Below, we will explain the cost accounting case using a project of 100 units of 200W street lights, along with a detailed discussion of the factors that contribute to price differences.
Solar street light installation cost calculation table
| Item | Quantity | Estimated Cost | Total Cost |
|---|---|---|---|
| 200W Led solar street light with pole | 100 | 500 | 50000 |
| foundation | 100 | 300 | 30000 |
| labor cost | 100 | 100 | 10000 |
| Total Cost | $90000 |
Solar street lamp maintenance cost calculation table
Operating Cost-Maintenance(Labor and Materials for 10 years)
| Descrlptlon | Example calculatlon |
|---|---|
| Led lights and batteries have an average life of 10 years and are replaced once every 10 years. | 200 per lamp *100 lamps=20000 |
| Labor cost: two people | S50.00 per hour * 2 * 40 hours=4000 |
| Tool cost :bucket truck | S50.00 per hour * 40 hours=2000 |
| 3% per year. The total cost of lamps + foundation pit + labor is 900 | 900*3%*100*10 years=27000 |
| Total 10 Year Maintenance Costs | $53,000 |
The total cost over 10 years：$90,000 + $53,000 = $143,000
Electricity street light price calculation
Street light price and installation cost calculation table
| Item | Quantity | Estimated Cost | Total Cost |
|---|---|---|---|
| 200 watt led street light with pole | 100 | 300.00 | 30000 |
| Conduit and cable | 2500m | 30.00 | 75000 |
| Lighting control cabinet | 2 | 2000.00 | 4000 |
| Junction boxes | 40 | 50.00 | 2000 |
| foundation | 100 | 300 | 30000 |
| Dig groove | 2500m | 50 | 125000 |
| Manual installation | 100 | 100 | 10000 |
| Total Cost: | $276000 |
Street light Operating Cost-Energy
| Descrlptlon | Example calculatlon |
|---|---|
| Number of fixtures | 100 fixtures |
| Watt(W) | 200 watts |
| Wattage of all street lights | 100×200 watts =20 kW |
| Electricity price | 20KW * 0.2 =4 per hour |
| If lit for 11 hours daily, that’s 4,015 hours a year. | $4 * 4015 * 10 years= $172000 |
| Total 10 Year Power Costs | $172000 |
Street lamp Operating Cost–Maintenance
Labor and Materials for 10 years
| Descrlptlon | Example calculatlon |
|---|---|
| Led lights have an average life of 10 years and are replaced once every 10 years | 150*100=15000 |
| Labor cost: two staff | S50.00 per hour * 2 * 40 hours=4000 |
| Tool cost: bucket truck | S50.00 per hour * 40 hours=2000 |
| 3% per year. (A total of 700 lamps cost + foundation pit + labor cost) | 700*3%*100*10 years=21000 |
| Total 10 Year Maintenance Costs | $42,000 |
Overall cost over 10 years: ：$276000 + $172000 + $42,000 = $490,000
Traditional street lights VS solar street lights
Based on the comparison of the 100 units of 200W streetlights above, solar streetlights have many advantages. The initial investment cost is lower: although the unit cost of solar streetlights is higher ($500 vs. $300), the total installation cost is lower ($90,000 vs. $490,000). Additionally, solar streetlights have zero energy costs, which reduces long-term operating expenses.
