Industry testing (was PV orientation) [RE-wrenches]

[William Miller]

Friends:


What is the mandate for Sandia Labs?  Shouldn't they consider tests such as
this?  Can we ask them to do this type of testing?  Can't they test
GC1000s, STXR inverters and SB inverters and give us definitive answers on
performance?  How about consumer reports?  I'd like better data!

At 02:04 PM 8/22/02 -0700, you wrote:
>You can also use a $50K multitracer from Daystar and put up to 15 or so
>modules of the same type in whatever orientations you want. The Daystar will
>operate the modules at max power and record the energy delivered for each
>module. That would probably be the best--but who's going to pay for it?
>
>I guess we have to trust our models for now and keep first things first.
>Shading is a WAY bigger issue than orientation.
>
>Bill.
>
>
>-----Original Message-----
>From: Mangelsdorf, Marco [mailto:mmangelsdorf at hei.com]
>Sent: Thursday, August 22, 2002 1:35 PM
>To: RE-wrenches at topica.com
>Subject: SPAM: RE: PV orientation [RE-wrenches]
>
>
>Massuh Bill and others,
>
>Here's a teaser.  Let's look at two identically sized PV arrays.  One facing
>due south at latitude.  The other one is split 50-50 due east and due west
>at a slope of, say, 15-20 degrees.  Figure no shading issues for either
>system along with clear sky insolation throughout the whole day.  I'd think
>that the due south system would put out more solar kWhs over the course of
>the year.  What would you estimate the percentage difference to be, on a
>yearly basis, between these two systems?
>
>marco
>ProVision Technologies
>Hilo, Hawai'i
>
>
>These are orientation multipliers for the two states
>
>For New York:
>
>Direct./ oTilt	0o	15o	30o	45o	60o	90o
>South			0.87	0.96	1.00	0.98	0.92	0.66
>SE,SW			0.87	0.93	0.94	0.91	0.85	0.62
>E,W			0.87	0.85	0.81	0.74	0.67	0.49
>
>
>For California:
>
>Direct./ oTilt	0o	15o	30o	45o	60o	90o
>South			0.89	0.97	1.00	0.97	0.89	0.58
>SSE,SSW		0.89	0.97	0.99	0.96	0.88	0.59
>SE, SW		0.89	0.95	0.96	0.93	0.85	0.60
>ESE,WSW		0.89	0.92	0.91	0.87	0.79	0.57
>E, W			0.89	0.88	0.84	0.78	0.70	0.52
>
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William Miller
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