<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:arial,helvetica,sans-serif;font-size:12pt">I usually keep in mind that the modules will degrade by 10% However, if you are one of those wrenches promoting 3% DC Voltage Drops, maybe you should add some more.<br><div> </div>Nick Soleil<br>Project Manager<br>Advanced Alternative Energy Solutions, LLC<br>PO Box 657<br>Petaluma, CA 94953<br>Cell: 707-321-2937<br>Office: 707-789-9537<br>Fax: 707-769-9037<div><br></div><div style="font-family: arial,helvetica,sans-serif; font-size: 12pt;"><br><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><font size="2" face="Tahoma"><hr size="1"><b><span style="font-weight: bold;">From:</span></b> Drake Chamberlin <drake.chamberlin@redwoodalliance.org><br><b><span style="font-weight: bold;">To:</span></b> re-wrenches@lists.re-wrenches.org<br><b><span
style="font-weight: bold;">Sent:</span></b> Tue, April 6, 2010 1:58:56 AM<br><b><span style="font-weight: bold;">Subject:</span></b> [RE-wrenches] Voltage degradation<br></font><br>
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Esteemed Wrenches, <br><br>
How much voltage overhead should we have available on our arrays to allow
for inverters not to fall out of their DC voltage operating range?
Since the module power degradation is 20% over the warranty period, I
usually shoot for a module voltage that can drop 20% and still be within
the MPPT range of the inverter under the average high temperatures, since
most of the degradation is in voltage.<br><br>
Am I being too conservative with this number? It always pushes the
number of modules to the top of what is allowable on the string for the
extreme low. <br><br>
Thanks,<br><br>
<p>
<font color="#0000ff">Drake Chamberlin<br>
Athens Electric<br>
OH License 44810<br>
CO License 3773<br>
NABCEP </font><font size="1" color="#0000ff">TM
</font><font color="#0000ff">Certified PV Installer <br>
Office - 740-448-7328<br>
Mobile - 740-856-9648 </font><meta http-equiv="x-dns-prefetch-control" content="on"></p></div></div>
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