Average sun-hours [RE-wrenches]

[Dean T. Newberry]

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Hi Tom,
the EnergyCalc spreadsheet on my website at http://talbottsolar.com  has 
a couple of hundred US cities with the NOAA sunnieness data.
There are summaries for summer and winter data. CEC rated system output 
needs to be reduced 10% to get hour by month data that matches the 
monitoring I've been doing here. You can easily model diffenent designs 
with the spreadsheet.

Koror and Yap Islands in the South Pacific are the only ones with higher 
winter output than summer with horizontal arrays
When you set the array tilt to the latitude even Las Vegas still has 
more summer than winter,same for Hilo and Honolulu.

What do other insolation calculators get??

cul  deant

Tom Elliot, Guffey Energy Works wrote:

> 
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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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-- 
*Quantum Energy Group*
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*www.quantumcenergy.com* <http://http://mjdsolar.com/>
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	Dean T. Newberry
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deant at dcn.org <mailto:deant at dcn.org>

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