1 Unit = 1 Kilowatthour (kWh)
10 Units = 10kWh
If you have ToU (time of use, digital) meter i assume your billing rates would be as follows:
off-peak: 12.50
peak: 17.50
Summer Peak Hours = 5 - 9 pm = 4 hours. Assuming no load-shedding during those hours. As you run after 9pm all your charges are off-peak
Total Cost per unit = 12.50
Total Units = 10
Total Cost of electricity = Units * Cost per Unit = 12.50 * 10 = 125.0 Rupees
One day = 125/2 = 62.5 Rupees (assuming it is 10 units over two days, not 10 units per day, in which case simply substitute 62.5 with 125 in the calculations on difference below)
As a comparison Mr. Slim consumes ~7.9 amps; thus 7.9*240 = 1896 Watts, we'll say 1900 Watts or 1.9kW.
We'll assume an 80% on duty cycle (though it would be less realistically). meaning if I run it between the same time you did it would be running at full load for 80% of that time: .8*7 = 5.6 hours; we'll say 5.5 hours
Lets do the same math
Total hours = 5.5 @ full cycle
Total units consumed = 1.9 * 5.5 = 10.45
Cost per unit = 12.50
Total Cost = 10.45 * 12.50 = 130.625
for the 20% of the time lets say it runs the fan and the electronics say 2 amps = 0.48 KW
Off-Cycle Hours: 1.5
Off cycle units: .48*1.5 = .72
Total Cost = .72*12.50 = 9 Rupees
Total cost for Mr. Slim = 9 + 130.625 ~ 140
Diff between Mr. Slim and your new AC = 140 - 62.5 = 77.5 Rupees
% diff ~ 55%
Impressive!
Do go over my math it was all done mentally and i am pretty old to consider my mental math error proof.
