Jay Renewable Energy Private Limited
Jay Renewable Energy Private Limited
MIDC, Miraj, Maharashtra


Comparison Of Solar Water Heaters With Electrical Geysers

Cost of electricity RS. 5.00 per unit (kWh)
Total heat gain kcal/ day System capacity x Temp. difference
= 125 x 40 = 5000 kcal/day
= 5000 x 4.2 kJ/ day = 21,000 kJ/day
Total heat gain = 21000/ 3600 kWh/ day
Saving in electricity = 5.83 kWh / day
Saving in electricity cost = Units saved x cost / unit
= 5.83 x 5
Saving / day Rs. 29.15
Saving per year = 29.15 x 300
= Rs. 8745
Payback period = Total cost/ saving per year
= 25000/8745
Payback period = 2.85years
Payback period with subsidy 19000/8745 = 2.17 years

Actual payback period becomes much shorter if the periodic rise in the cost of oil/ electricity, maintenance and handling charges for geysers or boilers and depreciation allowance available are accounted for. With MNRE upfront subsidy under JNNSM, the cost of the system becomes Rs. 19000/- and payback period works out to 2.77 years and 2.17 years respectively.
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Vijay Savadi (Director)
D-64, Miraj, MIDC
Miraj- 416410, Maharashtra, India

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