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

[Bill Brooks]

John,

I think we are very close on the performance testing. I talked with Chuck
yesterday, and he said to pass along that the draft inverter performance
document will be out next month. Obviously yours and other manufacturers
input will be greatly appreciated to finalize the standard. In the meantime,
we can start testing to a draft standard and see how things turn out.

Bill.


-----Original Message-----
From: jberdner at sma-america.com [mailto:jberdner at sma-america.com]
Sent: Friday, August 23, 2002 8:58 AM
To: RE-wrenches at topica.com
Subject: SPAM: RE: Industry testing (was PV orientation) [RE-wrenches]


William:

Sandia is prohibited from doing performance comparisons.
This is why Tom Hund's battery / charge controller studies were always
Battery A, Charge controller B, etc.

I have been asked Sandia, NREL, CEC, Endecon, FSEC, ect. For performance
testing for almost two years now.

I think maybe they are getting close to having a draft of a proposed
test.
Or, maybe not.

Your tax dollars hard at work.

If you have any questions, or if I can be of any further assistance,
please do not hesitate to contact me.

Best Regards,

John Berdner

SMA America, Inc.
20830 Red Dog Road
Grass Valley, CA  95945
530.273.4595 (voice)
530.274.7271 (fax)


-----Original Message-----
From: William Miller [mailto:wrmiller at slonet.org]
Sent: Thursday, August 22, 2002 3:02 PM
To: RE-wrenches at topica.com
Subject: Industry testing (was PV orientation) [RE-wrenches]

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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