PV orientation [RE-wrenches]

[jberdner at sma-america.com]

Marco:

The info's right there bro.

1/2 the array East at 15 Degrees = 0.5 * 0.88 = 0.44
1/2 the array West at 15 Degrees = 0.5 * 0.88 = 0.44

                          Total for the array = 0.88

In our case this assumes that the entire series string is on one
orientation.
If you wire it so that 1/2 the series string faces East and the other
half West you will get MUCH less power. 
 
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: Mangelsdorf, Marco [mailto:mmangelsdorf at hei.com] 
Sent: Thursday, August 22, 2002 1:35 PM
To: RE-wrenches at topica.com
Subject: 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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