On Friday, November 22, 2019 at 7:14:03 PM UTC-5, Ralph Mowery wrote:
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 ?

Generally they try to size it so that it generates about what you use
in total energy, so your bill would be close to zero. But its' not
necessarily so simple. For example, here in NJ, solar customers get
certificates for the amount of energy their solar array generates.
It doesn't matter if you used all of that electric or put some of
it into the grid. The electric companies are under a mandate to get
X% of their energy each year from renewables and home solar counts
toward that. So, the power companies then buy these certificates
in an auction from the solar array owners. How much you then get
varies. It was pretty high, with early adopters getting thousands
for those certificates some years ago. More recently I think it's
gone down quite a bit.