Energy Saving - Calculation

Approximate saving with cost estimate (Example):   USING LED LAMPS . >50 % SAVING.

Description

Watts consumption Without Energy saving lights

Watts consumption  
With Energy saving LED bulb or LED tube light

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  
With Energy saving control

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.