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Ralph Mowery

In article , says...

It costs about $10k for a typical system nowadays with credits; and that won't change
much next year, even with the 50% cut in the federal tax credit. And
the payback period runs from 7 to 10 years depending on your insolation
and average electric supplier rates.

So far I do not recall anyone saying if you put that 10,000 in stock or
something giving aorund 5% interist or if you had to borrow that 10,000
for 5 or more years what would be the payback.

What is the cost reduction per month or year in percent ? Do you save
50 % or 75 % of the cost of electricity ?