[RE-wrenches] Power line shading

[Nick Soleil]

I have some anecdotal experience that may be valuable.  I just recently 
installed a system under a set of 3 power and 3 phone wires located about 20' 
above the array.  The system was installed with Enphase micro-inverters, so I 
could clearly see the effect of the wires on the shaded modules.  I just checked 
todays production, and the modules with wire shadows on them were producing 
18-21% less per module than the modules without the shadows. 

     At another site with just one 1/2" phone wire located 3' above a module, 
that module is producing  2-3% less when shaded. 


 Nick Soleil
Project Manager
Advanced Alternative Energy Solutions, LLC
PO Box 657
Petaluma, CA 94953
Cell:   707-321-2937
Office: 707-789-9537
Fax:    707-769-9037




________________________________
From: Eric Thomas <solarepiphany at gmail.com>
To: RE-wrenches at lists.re-wrenches.org
Sent: Mon, October 11, 2010 12:28:33 PM
Subject: [RE-wrenches] Power line shading


Hey there,
We have a string inverter system installation coming up that has a power line 
suspended over the roof. The line is diagonal to the roof and about 20' above 
the surface. It will be very challenging to configure the strings to mitigate 
shading. Does anyone have experience with the effects on producion from the thin 
shadow cast by the powerline? 

Thanks
Eric Thomas 
Solar Epiphany LLC
Seattle
(206)919-3014


      
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