In this problem, we consider replacing an existing electrical water heater with

Question

In this problem, we consider replacing an existing electrical water heater with an array o solar panels. The net installed investment cost o the panels is $1,520 $1,900 less a 20% tax credit the government). Based on an energy audit, the existing water heater uses 190 kilowatt hours (kWh) of electricity per month, so at $0.13 per kWh, the cost of operating the water heater is $24.7 per month. Assuming the solar panels can save the entire cost of heating water with electricity, answer the following questions. a. What is the simple payback period for the solar panels? b. What is the IRR of this investment if the solar panels have a life of 11 years? a. The simple payback period is 62 months. (Round to the nearest whole number.,) b. The IRR of the investment is 1% per month. (Round to two decimal places.)

Explanation / Answer

IRR is an inteest rate at which Present worth of benefit equals to cost

Benefit is we will be saving on water heater for the span of solar panals

Benefit per year=24.7*12=296.4

PW of Benefit=296.4/(1+irr)+296.4/(1+irr)^2+...+296.4/(1+irr)^11=1520

By trial error methd we get irr=11.5%

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