<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:'times new roman', 'new york', times, serif;font-size:12pt"><div>Perhaps some day in the not too distant future, we will switch from tax credits (like in Hawaii) to performance based incentives and this topic will be resolved from empirical evidence vs unsubstantiated claims.</div><div>Then the educated public can see a side by side comparison.</div><div>This would have to have some independent verification and a side by side comparison of string vs individual inverters, or we are just guessing.</div><div><br></div><div>Next week in LA at SPI, there is bound to be more enphase types of products hitting the market. Eventually, I see it all going that way- having them built in. Sure there are lots of debates, like this past months article in solar pro magazine, but if they came off the assembly line AC ready, it will truly be another appliance that
needs to be plugged in.</div><div><br></div><div>String inverters for all of us have kept the riddle alive by not always providing the granular information for us to know the effectiveness of the solar panels and the varying site conditions they are required to work in.</div><div><br></div><div>Aloha</div><div><br></div><div>Keith</div><div style="font-family:times new roman, new york, times, 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> Darryl Thayer <daryl_solar@yahoo.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 2:52:02 AM<br><b><span style="font-weight: bold;">Subject:</span></b> Re: [RE-wrenches] Enphase v. string inverter<br></font><br>
<table cellspacing="0" cellpadding="0" border="0"><tbody><tr><td valign="top" style="font:inherit;"><div>I have seen the top performing contractor in my area sell behind a chiminy and under a tree, claiming 10% more using Enphase than unshaded. </div>
<div>Darryl<br><br>--- On <b>Sun, 10/10/10, Jamie Johnson <i><jjohnson@spefl.com></i></b> wrote:<br></div>
<blockquote style="BORDER-LEFT:rgb(16,16,255) 2px solid;PADDING-LEFT:5px;MARGIN-LEFT:5px;"><br>From: Jamie Johnson <jjohnson@spefl.com><br>Subject: Re: [RE-wrenches] Enphase v. string inverter<br>To: "RE-wrenches" <re-wrenches@lists.re-wrenches.org><br>Date: Sunday, October 10, 2010, 7:38 AM<br><br>
<div id="yiv1621106046">
<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="yiv1621106046Apple-style-span">Jamie Johnson</span></div>
<div><span class="yiv1621106046Apple-style-span">General Manager</span></div>
<div><span class="yiv1621106046Apple-style-span">SOLAR POWER ELECTRIC TM</span></div>
<div><span class="yiv1621106046Apple-style-span">NABCEP Certified Solar PV Installer #031310-118</span></div>
<div><span class="yiv1621106046Apple-style-span">(941) 380 - 0098</span></div>
<div><span class="yiv1621106046Apple-style-span"><a rel="nofollow" target="_blank" href="http://www.spefl.com/">www.SPEFL.com</a></span></div>
<div><span class="yiv1621106046Apple-style-span">Commercial & Residential</span></div>
<div><span class="yiv1621106046Apple-style-span">FL State Certified # EC13001765</span></div>
<div><span class="yiv1621106046Apple-style-span"><br></span></div>
<div><span class="yiv1621106046Apple-style-span">Sent from my iPhone</span><br></div></div>
<div><br>On Oct 9, 2010, at 7:07 PM, "Marco Mangelsdorf" <<a rel="nofollow" target="_blank" href="http://us.mc519.mail.yahoo.com/mc/compose?to=marco@pvthawaii.com">marco@pvthawaii.com</a>> wrote:<br><br></div>
<div></div>
<blockquote type="cite">
<div>
<div class="yiv1621106046Section1">
<p class="yiv1621106046MsoNormal">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></div>
<p class="yiv1621106046MsoNormal"> </p></div>
<p class="yiv1621106046MsoNormal">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></blockquote></div>
<p class="yiv1621106046MsoNormal">
</p><p class="yiv1621106046MsoNormal">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="yiv1621106046MsoNormal">
</p><p class="yiv1621106046MsoNormal">Thanks,
</p><p class="yiv1621106046MsoNormal">marco
</p><p class="yiv1621106046MsoNormal"> </p></blockquote>
<blockquote type="cite">
<div><span>_______________________________________________</span><br><span>List sponsored by Home Power magazine</span><br><span></span><br><span>List Address: <a rel="nofollow" target="_blank" href="http://us.mc519.mail.yahoo.com/mc/compose?to=RE-wrenches@lists.re-wrenches.org"></a><a rel="nofollow" target="_blank" href="http://us.mc519.mail.yahoo.com/mc/compose?to=RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a></span><br><span></span><br><span>Options & settings:</span><br><span><span><a target="_blank" href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a></span></span><br><span></span><br><span>List-Archive: <a rel="nofollow" target="_blank" href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a></span><br><span></span><br><span>List rules
& etiquette:</span><br><span><a rel="nofollow" target="_blank" href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a></span><br><span></span><br><span>Check out participant bios:</span><br><span><a rel="nofollow" target="_blank" href="http://www.members.re-wrenches.org/">www.members.re-wrenches.org</a></span><br><span></span><br></div></blockquote><br>-----Inline Attachment Follows-----<br><br>
<div class="plainMail">_______________________________________________<br>List sponsored by Home Power magazine<br><br>List Address: <a rel="nofollow" target="_blank" href="http://us.mc519.mail.yahoo.com/mc/compose?to=RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><br><br>Options & settings:<br><a rel="nofollow" target="_blank" href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br><br>List-Archive: <a rel="nofollow" target="_blank" href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br><br>List rules & etiquette:<br>www.re-wrenches.org/etiquette.htm<br><br>Check out participant bios:<br><span><a target="_blank" href="http://www.members.re-wrenches.org">www.members.re-wrenches.org</a></span><br><br></div></td></tr></tbody></table><br>
</div></div><div style="position:fixed"></div>
</div></body></html>