<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:arial,helvetica,sans-serif;font-size:12pt"> The main advantage of Enphase is the module level monitoring. However, the increased output due to partial shading can be significant. I was at a 6 year old PV site this week, and a tree had grown up near the base of the roof. Branches were casting a few minor shadows on the array, but was wiping out 75% of the production. I can assure you, those 9 modules would have been producing '50+% greater output'<br>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
face="Tahoma" size="2"><hr size="1"><b><span style="font-weight: bold;">From:</span></b> Jamie Johnson <jjohnson@spefl.com><br><b><span style="font-weight: bold;">To:</span></b> RE-wrenches <re-wrenches@lists.re-wrenches.org><br><b><span style="font-weight: bold;">Sent:</span></b> Sun, October 10, 2010 5:38:55 AM<br><b><span style="font-weight: bold;">Subject:</span></b> Re: [RE-wrenches] Enphase v. string inverter<br></font><br>
<meta http-equiv="x-dns-prefetch-control" content="off"><div>Marco,</div><div><br></div><div>The last I heard the NREL was testing enphase vs. a string inverter, they were also suppose to test enphase vs. A competitors module level mpp tracking. Not sure if that performance test is complete yet. </div><div><br></div><div>I have seen 1 independent unshaded test ( potentially biased ) which IIRC showed enphase ~1% less than a string inverter, this seems to match the inverters CEC rating.</div><div><br></div><div>What we see around here is an over estimate of kWh production by the selling contractor using enphase, sometimes by 50+% greater than unshaded kWh estimates.</div><div><br></div><div>Performance guarantees with monetary compensation back to the customer if estimates are not met can be a good thing and improve the industry IMHO.<br><br><div><span class="Apple-style-span" style="">Jamie Johnson</span></div><div><span
class="Apple-style-span" style="">General Manager</span></div><div><span class="Apple-style-span" style="">SOLAR POWER ELECTRIC TM</span></div><div><span class="Apple-style-span" style="">NABCEP Certified Solar PV Installer #031310-118</span></div><div><span class="Apple-style-span" style="">(941) 380 - 0098</span></div><div><span class="Apple-style-span" style=""><a rel="nofollow" target="_blank" href="http://www.SPEFL.com">www.SPEFL.com</a></span></div><div><span class="Apple-style-span" style="">Commercial & Residential</span></div><div><span class="Apple-style-span" style="">FL State Certified # EC13001765</span></div><div><span class="Apple-style-span" style=""><br></span></div><div><span class="Apple-style-span" style="">Sent from my iPhone</span><br></div></div><div><br>On Oct 9, 2010, at 7:07 PM, "Marco Mangelsdorf" <<a rel="nofollow" ymailto="mailto:marco@pvthawaii.com" target="_blank"
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">Does anyone know of any reports out there from a neutral, 3<sup>rd</sup>
party which compares an Enphase array with an array using a string inverter with
both arrays on the same unshaded surface?</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Some Enphase peddlers here are saying that the energy harvest
from an Enphase system is going to be better since they supposedly come on
sooner and stay on later in the day.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">One guy is actually saying that the Enphase inverters come
on before the sun comes over the horizon. Maybe from the same family that
claimed that a-Si modules produced power from the moonlight.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Thanks,</p>
<p class="MsoNormal">marco</p>
<p class="MsoNormal"> </p>
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