Energy Saving - Calculation
Approximate saving with cost estimate (Example): USING LED LAMPS . >50 % SAVING.
Description |
Watts consumption Without Energy saving lights |
Watts consumption |
Power consumption of one tube light in watts |
40 |
20 |
Operational hours per day |
12 |
12 |
Total consumption in watts per day |
480 |
240 |
Number of days in a month |
30 |
30 |
Total power consumed by one tube light in kw |
14.4 KW |
7.2 KW |
Cost of electricity per kw in Rupees ( * varies with consumer type) |
6.75 |
6.75 |
Amount paid per month @ Rs.6.75 |
97.20 |
48.60 |
Savings per month per 1 tube light in Rupees |
*** |
48.60 |
Savings per year per 1 tube light in Rupees |
*** |
583.20 |
ROI CALCULATION
Description |
Rs. |
Cost of one 40 W ordinary tubelight with electronic choke and fittings |
Rs. 400 |
Life of an ordinary tubelight |
2 years |
Cost of maintaining a tube light for 24 years |
Rs. 400 x 12 = Rs. 4,800 |
Cost of one 20W LED tubelight that gives same, but healthy light |
Rs. 2,400 |
Expected minimum life of LED lights |
24 years ( > 50,000 burn hours) |
Cost saved |
4800 – 2400 = Rs.2,400 |
Saved energy cost for 24 years per tube light |
583.20 x 24 = Rs. 13,997 |
Total Saving per tubelight |
2400 + 13997 = Rs. 16,397 |
ROI |
( 16397-2400)/2400= 5.83 |
Return on Investment (%) |
583.2% |
Simple Annualized ROI (%) |
24.3% |
ENERGY SAVING USING INTELLIGENT CONTROLLERS
Description |
Watts consumption Without Energy saving control |
Watts consumption |
Power consumption of one tube light in watts |
40 |
40 |
Operational hours of corridor tube lights |
12 |
3 |
Total consumption in watts per day |
480 |
120 |
Number of days in a month |
30 |
30 |
Total power consumed by one tube light in kw |
14.4 KW |
3.6 KW |
Cost of electricity per kw in Rupees ( * varies with consumer type) |
6.75 |
6.75 |
Amount paid per month @ Rs. 6.75 |
97.20 |
24.40 |
Savings per month per 1 tube light in Rupees |
*** |
Rs. 72.80 |
* For higher wattage Electrical Appliances the saving will be much more.