120 degree azimuth [RE-wrenches]

[Blake Jones]

Yeah, here in Colorado we periodically install systems with azimuths ranging
from 90 to 270.  Our rebate program is similar to how CSI is intended to be
as it includes a performance-based component....whereby a production
estimate from PVWATTS can be used to reduce (or even increase) the total
rebate amount if the production is considered to be more than +/- 10%
different from a "baseline" production estimate (when tilt = latitude,
azimuth = 180).  We therefore always check to see if there's any impact on
the rebate.  So far in the first year of our incentive program, this idea
seems to be working pretty well and has helped prevent rebates from being
paid for systems that are installed to face north, etc....

Other than something like that, I would also recommend checking into the
utilities' time-of-use metering, if they offer it.  We recently had a
utility here in Colorado change their TOU peak billing time to start later
in the day at 2pm....so that the new peak billing window is now from 2pm to
9pm.....which makes an east-facing PV system much less attractive from a
financial perspective.

Regards,
Blake Jones
Namaste Solar Electric
Boulder, Colorado


>Wrenchisimos,
>
>I have a customer that has asked me to design/price a 22kw system for a
>hotel.  The back of the roof is about 26 degrees tilt but facing 120
>degrees, 60 degrees off of due south.  I ran the numbers on PV Watts and
>it showed only a 7.6% loss of power.
>
>Can anyone comment from experience on an installation 60 degrees to the
>east of south?  I don't want to make a poor recommendation.  Because of
>the site layout there is very little possibility of a canopy/parking
>type installation which is what I would like to do.
>the roof is ideal otherwise.
>
>Steve Johnson
>LightWave Electric
>Nashville, Tennessee


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