PVs on tower [RE-wrenches]

[Kelly Keilwitz]

Kurt,

>
>  "We've recently decided to go with a wider layout, and to tilt
> the modules to the optimum angle, and space them to avoid shading.
> This is still under discussion, but the rough plan is to have the
> modules between 50 and 100 feet on the tower."
>
> I think you're correct in trying to better optimize the tilt, you can
> get a similar output from that of a much larger array with modules
> mounted flat to the tower.  Also, in most regions it is typically much
> less windy in the summer when you are going to need the PVs.  If you are
> in snow country I'd say shoot for latitude plus 15 to 20 degrees which
> doesn't have the bottoms of the modules kicked out too far.

We're now designing for 63 degrees from horiz, which is latitude + 15, or
approximately the ideal avg winter orientation. This gives us enough
summertime boost to meet the load while keeping the spacing necessary to
avoid shading from successive rows of modules to a minimum. We're also
looking at making the rows succesively narrower by one less module as we
move up the tower to account for the narrowing tower width and increased
wind intensity (and overturning moment) with at height. Kind of a pyramid
shape.

-Kelly

Kelly Keilwitz, P.E.
Whidbey Sun & Wind
Renewable Energy Systems
986 Wanamaker Rd, Coupeville, WA 98239
ph & fax: 360-678-7131
sunwind at whidbeysunwind.com
www.whidbeysunwind.com
Renewable Energy Now!

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