insolation = system performance [RE-wrenches]

[Marco Mangelsdorf]

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Dear The E. Bill,

What's your rule-of-Bill's-thumb when it comes to estimating actual AC kWh
performance?  kWh/m2/day X array size DC STC X what % in terms of overall
system efficiency?  I've been using .8 as that multiplier and have been
pretty satisfied with the estimated actual real-world results.

marco
ProVision

Jeff,

Sorry that the URL text wrapped in the message, but the interesting thing
about this site is that it appears that among the 10 sites that the annual
average daily 30 degree tilt irradiation is about 5 kWh/m^2/day (sun hours).
The lowest is about 4.6 and the highest 5.3 for plane of array 30 degrees.
The data on the website is in kWh/ft^2/year and is for global horizontal. As
expected, the 4.6 sites are near the ocean and the 5.3 sites are near the
Bay.

Bill.

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