FirstLook question [RE-wrenches]

[Kurt Albershardt]

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> I have registered and used http://firstlook.3tiergroup.com/ for the first
> time. It looks like a powerful resource, especially as it can serve as a
> documentable reference for solar and wind assessment data used in system
> designs.

Hadn't seen them before, but I think a lot of this data may be available from <http://eosweb.larc.nasa.gov/sse/>


> It looks to me as though direct
> normal irradiance, which is a higher figure (kilowatt-hours/meter
> squared/day) would be best for a two-axis tracking array that always
> faced the sun.

Correct.



> global horizontal irradiance would be lower than
> accurate, as our typically seasonally-adjusted arrays are not
> horizontal, yet neither do they follow the daily sun path.
>
> Who can advise a good compromise, or other approach that is defensible
> using this data?

The NASA site has data for arrays tilted at latitude and +/- 15º from that.






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