Average sun-hours [RE-wrenches]

[Tom Elliot, Guffey Energy Works]

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OK, this is where my pet peeve comes in.  How about starting this discussion
with the realization (and clear statement) that there are fairly large areas
of the country where winter sun produces more power than summer sun.  I get
my best power output on the shortest days of the year here in Colorado and
far less output, because of bad horizontal sun angles at sunrise and sunset
and common mid-day clouds, during the summer months.  Someone who designed
for real world sun conditions here, and throughout most of the Rocky
Mountain states and the Southwest, would be starting from a false premise by
assuming summer is more productive.  I understand completely that there are
very large populations for whom the winter/summer dichotomy is as you assume
it to be but we do not do the world of solar any favors by reinforcing the
misconception of winter=lowpower/summer=highpower meme as a basic truth of
solar design.

Please be accurate enough to put in the appropriate modifiers in such a
statement to identify that it is not a universal truth.

Sorry, but the whole country does not reside on the two coasts...

Tom

____________________________________

Greetings all,

Can I request a thought or two on using annual average sun-hours versus
winter sun-hours for designing off-grid PV systems?

While it would be really nice to not design a system around any
generator run-time, is that practical when one looks at the fact that
the resulting system is so oversized for the most of the solar year?
BTW, I am not saying there would be no generator or generator run-time
in either case, but am interested in it from a system design
perspective.

Thanks in advance.

Kurt Nelson
SOLutions

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