FirstLook question [RE-wrenches]

Darryl Thayer daryl_solar at yahoo.com
Fri May 2 07:25:24 PDT 2008


It seems to me that RetScreen free on line, version 4
does everything and is easier to use.  It does wind
and solar, in an easy logical format, for two axis,
fixed and some type of single axis.  Retscreen does it
with ease and many other types of analysis .

--- Kurt Albershardt <info at es-ee.com> wrote:

> 
> > 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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>
> 
> 



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