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 A solar energy system is an investment like many others, and should yield
a good return immediately. Consider how much money the solar energy
system saves you on an average monthly or annual basis.Then compare this
with the "opportunity cost" of the money that the solar system costs. The
"opportunity cost" is either what the money costs to borrow, or the money
that you forfeited by taking the money out of another investment.
If you are not making money immediately, perhaps the solar system is not a
good investment and you should not build it. A solar heating system that
does not make good economic sense often does not make environmental sense
either.
Cost benefit analysis for a solar energy system in the Boston, MA area predicts
that the investment will yield about 12% per year. If the cost of conventional
energy such as fossil fuels goes up in the future, the value of the solar
investment goes up, too. You should keep in mind that the income from the
solar investment is tax-free. More information about cost benefit
is available in the US Department of Energy Report. (in the
INFO LIBRARY)
http://www.radiantsolar.com/pdf/DOEREPORT.pdf
To learn more, see our answer to the followup question:
How much can solar really do for me?
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