Know of a good model for determining ROI of purchasing solar panels? How they compare to other investments?
I'd like to compare buying panels to buying mutual funds, lending money, etc. with a way to alter rebate, PV specs, etc.
Sure, use the NPV function in Excel.
set up two equations, one that have the capital of the panels (and any other costs you will incur over 5 years or so) along with the amount of your electricity bill that you will save per year and the other one has the investment and return for you mutual funds or such. which ever is bigger wins.
... don't forget about taxes on investment (or the solar panels), and don;t forget that you get your capital back on your investments.
luck
Solar Panel Review / Comparison / Performance - Part 1/4
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