A 5 kw solar energy system can collect 9000 kwh of energy per year. Arizona electricity is .011 cent per kilowatt hour. The aver
age Arizona home uses 66 million btu per year. Given that 1 btu= 0.000293 kwh find the number of kilowatt hours used by the average home in Arizona in a given year. B. How much does a typical Arizonan homeowner spend on electricity per year?
C. If a typical Arizona household were to install a 5 kw solar system, how much would it save on electricity per year?
D. Given that the 5 kw system would cost $20,000 to install (minus a 30% federal tax credit) how many years would it take to recoup the initial investment?
