Alternative Power sources - Re: Questions about Solar Energy for my Home Summary:

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Re: Questions about Solar Energy for my Home Summary:

Ed Earl Ross

2005-06-29, 4:25 am

nicksanspam@ece.villanova.edu wrote:

quote:

> Ed Earl Ross <edearl@satx.rr.com> wrote:
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> You are welcome.
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> Yes, in common English, and as you say, 99.999% is not a lot more
> than 99%, but in many applications, eg power grids and air traffic
> control, there's a big difference between 0.001% (5 minutes per year)
> and 1% (88 hours per year.) Phone companies design redundant systems
> to meet an unavailability budget of less than 30 seconds per year.

True. However, most commercial grid-backup systems are composed of
a UPS and diesel generator, not PV.

--
Humbly--Ed

"If the man doesn't believe as we do,
we say he is a crank, and that settles it.
I mean, it does nowadays, because now we
can't burn him." (Mark Twain)

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