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:

nicksanspam@ece.villanova.edu

2005-06-28, 6:25 pm

Ed Earl Ross <edearl@satx.rr.com> wrote:

quote:

>Thanks for sharing the Markov chain calculation...

You are welcome.

quote:

>Did your statement, "And the combination can be a lot more reliable
>than either, given a few batteries," imply a grid tie that is very
>unreliable?

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.

Nick

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