<html><body bgcolor="#FFFFFF"><div>Marco,</div><div><br></div><div>If you are looking for an equation for the measured ac output in watts to compare to STC, then solarpro mag had an article in OCT/NOV 2009 along with a temp and irradiance factor chart that may help.</div><div><br><br><div><span class="Apple-style-span" style="-webkit-composition-fill-color: rgba(175, 192, 227, 0.231373); -webkit-composition-frame-color: rgba(77, 128, 180, 0.231373); ">Jamie Johnson</span></div><div><span class="Apple-style-span" style="-webkit-composition-fill-color: rgba(175, 192, 227, 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.230469);">General Manager</span></div><div><span class="Apple-style-span" style="-webkit-composition-fill-color: rgba(175, 192, 227, 0.231373); -webkit-composition-frame-color: rgba(77, 128, 180, 0.231373);">SOLAR POWER ELECTRIC TM</span></div><div><span class="Apple-style-span" style="-webkit-composition-fill-color: rgba(175, 192, 227, 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.230469);">NABCEP Certified Solar PV Installer #031310-118</span></div><div><span class="Apple-style-span" style="-webkit-composition-fill-color: rgba(175, 192, 227, 0.231373); -webkit-composition-frame-color: rgba(77, 128, 180, 0.231373);">(941) 380 - 0098</span></div><div><span class="Apple-style-span" style="-webkit-composition-fill-color: rgba(175, 192, 227, 0.231373); -webkit-composition-frame-color: rgba(77, 128, 180, 0.231373);"><a href="http://www.SPEFL.com">www.SPEFL.com</a></span></div><div><span class="Apple-style-span" style="-webkit-composition-fill-color: rgba(175, 192, 227, 0.231373); -webkit-composition-frame-color: rgba(77, 128, 180, 0.231373);">FL State Certified # EC13001765</span></div><div><span class="Apple-style-span" style="-webkit-composition-fill-color: rgba(175, 192, 227, 0.231373); -webkit-composition-frame-color: rgba(77, 128, 180, 0.231373);"><br></span></div><div><span class="Apple-style-span" style="-webkit-composition-fill-color: rgba(175, 192, 227, 0.231373); -webkit-composition-frame-color: rgba(77, 128, 180, 0.231373); ">Sent from my iPhone</span><br></div></div><div><br>On Oct 12, 2010, at 9:17 PM, "Marco Mangelsdorf" <<a href="mailto:marco@pvthawaii.com">marco@pvthawaii.com</a>> wrote:<br><br></div><div></div><blockquote type="cite"><div>
<div class="Section1">
<p class="MsoNormal">Could someone please provide me with that generally accepted
equation when it comes to estimating AC output from a PV array versus the STC
rating?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">That is, I’m looking for that equation which estimates
the losses due to mod mismatch, soiling, wire losses, etc., etc. I’ve
got someone who mistakenly expects their PV array to put out 90 or more percent
of the STC rating.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">marco<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
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