<html><body><div style="color:#000; background-color:#fff; font-family:arial, helvetica, sans-serif;font-size:12pt"><div><span>I have like many of you installed both micro inverters and solar edge optimizers. We have had failures on both, both Co's have been very quick to respond. <br></span></div><div><br><span></span></div><div><span>For installation the optimizers were a lot faster than the micro's to install, nothing is a fast as a string inverter. I am sold on the optimizers, as I see improved performance under shade conditions. I have two more optimizer system on the books for spring, and will be able to comment. <br></span></div><div><span>DT<br></span></div><div><br></div> <div style="font-family: arial,helvetica,sans-serif; font-size: 12pt;"> <div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"> <div dir="ltr"> <font size="2" face="Arial"> <hr size="1"> <b><span style="font-weight:
bold;">From:</span></b> Marv Dargatz <Marv.Dargatz@solaredge.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> Thursday, January 12, 2012 6:46 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [RE-wrenches] SolarEdge v Enphase<br> </font> </div> <br>
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<div><div class="yiv1812548004WordSection1"><div class="yiv1812548004MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);">Dan,</span></div><div class="yiv1812548004MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"> </span></div><div class="yiv1812548004MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);">Thank you SO much for that post. You are absolutely right on.</span></div><div class="yiv1812548004MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"> </span></div><div class="yiv1812548004MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);">EVERY component in a circuit can be the weak link. Component quality, design margin, and actual use conditions really dictate what is
going to fail, and when.</span></div><div class="yiv1812548004MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"> </span></div><div class="yiv1812548004MsoNormal"><span style="font-size: 10pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"> </span></div><div class="yiv1812548004MsoNormal"><span style="font-size: 10pt; font-family: "sans-serif"; color: rgb(31, 73, 125);">See ya!</span></div><div class="yiv1812548004MsoNormal"><span style="font-size: 10pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"> </span></div><div class="yiv1812548004MsoNormal"><span style="font-size: 10pt; font-family: "sans-serif"; color: rgb(31, 73, 125);">Marv</span></div><div class="yiv1812548004MsoNormal"><span style="font-size: 10pt; font-family: "sans-serif"; color: rgb(31, 73, 125);">Director of Technology and Support, North
America</span></div><div class="yiv1812548004MsoNormal"><b><span style="font-size: 10pt; font-family: "sans-serif"; color: rgb(31, 73, 125);">SolarEdge Technologies, Inc.</span></b></div><div class="yiv1812548004MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);">Tech Support North America: +877.360.5292</span></div><div class="yiv1812548004MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);">Mobile: +530.392.0356</span></div><div class="yiv1812548004MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"> </span></div><div class="yiv1812548004MsoNormal"><b><span style="font-size: 10pt; font-family: "sans-serif";">From:</span></b><span style="font-size: 10pt; font-family: "sans-serif";"> re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <b>On Behalf Of </b>Exeltech<br><b>Sent:</b> Thursday, January 12, 2012 3:59 PM<br><b>To:</b> RE-wrenches<br><b>Subject:</b> Re: [RE-wrenches] SolarEdge v Enphase</span></div><div class="yiv1812548004MsoNormal"> </div><table class="yiv1812548004MsoNormalTable" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td style="padding: 0in;" valign="top"><div class="yiv1812548004MsoNormal" style="margin-bottom: 12pt;">Wrenches,<br><br>I wish this urban myth about electrolytic capacitors would<br>die, but it won't. It's been a wonderful marketing ploy for<br>some time now.<br><br>Simply stated, existence of electrolytic capacitors in inverters<br>does NOT mean the inverters are less reliable. Satellites<br>have been using electrolytic caps for decades, and look<br>how long THEY last! (I know, because I've helped to design<br>power supplies for aerospace applications.)<br><br>What it
boils down to is this: if a quality electrolytic capacitor<br>is used within its specifications, you can expect 60+ years<br>of life from it in an inverter application. Conversely, if a<br>circuit is poorly designed, you can ruin any electronic part<br>in a very short time.<br><br>What defines capacitor "life"? It's defined as the doubling<br>of the internal effective series resistance of the capacitor<br>from the value it had when it (the cap) was new.<br><br>This is energy lost. It also causes the capacitor to operate<br>at a slightly higher internal temperature than when it was<br>new (all other factors being the same).<br><br>Result? It all depends on how the circuit is designed. In<br>our case, the inverter efficiency decreases approximately<br>a quarter to one half of a percent. The waveform distortion<br>also increases, but it takes lab grade equipment to detect<br>the change. If you're worried about a
1/2 percent drop in<br>the inverter efficiency, your concern is misplaced. After all,<br>PV degrades over time much more than that!<br><br>So why the bad rap on capacitors?<br><br>Like tires, they DO wear out. 40 years ago, "premium"<br>tires were rated for 30,000 miles. Could you wear them<br>out in less? Absolutely! Drive like a 16 year old kid with<br>a muscle car, and it's easy. On the other hand, I just bought<br>a new set of tires. The old ones still had tread, but at 88,000<br>miles, they'd seen their better days. This is a far cry from 30k<br>mile tires.<br><br>Capacitors have progressed in the same manner. A long time<br>ago, capacitors wore out in 5 to 10 years. Today, it's an entirely<br>different story.<br><br>As long as the circuits in which the electrolytic capacitors are<br>used are well designed, you have nothing to worry about.<br>Electrolytic capacitors in a well-designed
application will outlive<br>all of us.<br><br><br>Dan Lepinski<br>Senior Engineer<br>Exeltech<br><br></div><div class="yiv1812548004MsoNormal" style="margin-bottom: 12pt;">From: Andrew Truitt <atruitt@gmail.com><br>Subject: Re: [RE-wrenches] SolarEdge v Enphase<br>To: "RE-wrenches" <re-wrenches@lists.re-wrenches.org><br>Date: Thursday, January 12, 2012, 12:25 AM</div><div id="yiv1812548004"><div><div class="yiv1812548004MsoNormal"> </div></div><div><div class="yiv1812548004MsoNormal">Does anyone have any experience installing SolarEdge? The advantage that I see over microinverters from a reliability standpoint is that the power optimizers do not contain electrolytic capacitors. The inverter is also supposed to last longer since it does not handle the MPPT duties so the electronics are less complex.</div></div><div><div class="yiv1812548004MsoNormal"> </div></div><div><div class="yiv1812548004MsoNormal">Marv - Do
you have any SolarEdge reliability and / or performance data you can share beyond the white paper on the SolarEdge website? Also, one issue that I've had with Enphase is an occasional loss of data transfer between inverters and the monitoring system - does SolarEdge have that issue? If not, how have you overcome it? Can you share a link to a live SolarEdge system monitoring interface?</div></div><div><div class="yiv1812548004MsoNormal"> </div></div><div><div class="yiv1812548004MsoNormal"> </div></div><div><div class="yiv1812548004MsoNormal"> </div></div><div><div class="yiv1812548004MsoNormal">Andrew Truitt</div></div><div><div class="yiv1812548004MsoNormal">Truitt Renewable Energy Consulting</div></div><div><div class="yiv1812548004MsoNormal"> </div></div><div class="yiv1812548004MsoNormal" style="margin-bottom: 12pt;"> </div><div><div class="yiv1812548004MsoNormal">On Thu, Jun 9, 2011 at 12:40 PM, Mark
Frye <<a rel="nofollow">markf@berkeleysolar.com</a>> wrote:</div><div><div class="yiv1812548004MsoNormal"><span style="font-family: "sans-serif"; color: blue;">Indeed.....</span></div><div class="yiv1812548004MsoNormal"> </div><div class="yiv1812548004MsoNormal"><span style="font-family: "sans-serif"; color: blue;">Yes it is 1v per module when not operating, but still >250V when operating. That means that all code requirements for >250V still apply to the DC wiring such as bonding bushings for conduit as required etc.</span></div><div><div class="yiv1812548004MsoNormal"> </div></div><div><div class="yiv1812548004MsoNormal"><span style="font-family: "sans-serif"; color: blue;">SolarEdge is making hay off of this safety feature, but this feature is inherent in microinverters as well. </span></div></div><div><div><br><span style="font-family: "sans-serif";">Mark Frye</span> <br><span
style="font-family: "sans-serif";">Berkeley Solar Electric Systems</span> <br><span style="font-family: "sans-serif";">303 Redbud Way</span> <br><span style="font-family: "sans-serif";">Nevada City, CA 95959</span> <br><span style="font-family: "sans-serif";">(530) 401-8024</span> <br><a rel="nofollow" target="_blank" href="http://www.berkeleysolar.com/"><span style="font-family: "sans-serif";">www.berkeleysolar.com</span></a><span style="font-family: "sans-serif";"> </span> </div><div><div class="yiv1812548004MsoNormal"> </div></div><div class="yiv1812548004MsoNormal"> </div></div><div class="yiv1812548004MsoNormal" style="text-align: center;" align="center"><hr align="center" size="3" width="100%"></div><div class="yiv1812548004MsoNormal" style="margin-bottom: 12pt;"><b><span style="font-family: "sans-serif";">From:</span></b><span style="font-family:
"sans-serif";"> <a rel="nofollow">re-wrenches-bounces@lists.re-wrenches.org</a> [mailto:<a rel="nofollow">re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>benn kilburn<br><b>Sent:</b> Thursday, June 09, 2011 10:54 AM<br><b>To:</b> Wrenches<br><b>Subject:</b> Re: [RE-wrenches] SolarEdge v Enphase</span></div><div><div class="yiv1812548004MsoNormal">Mark, </div><div><div class="yiv1812548004MsoNormal">I thought that the SolarEdge reduced the 'string' voltage to 1V per unit/module, reducing the high DC voltage risk factor, until the inverter switch was turned on?</div></div><div><div class="yiv1812548004MsoNormal"><br>The fact that by hitting the "off" switch on the inverter will reduce the potentially high DC voltage to 1V per unit/module could be an advantage from a safety perspective (maintenance, firemen/utility workers)</div></div><div><div class="yiv1812548004MsoNormal"> </div></div><div><div
class="yiv1812548004MsoNormal">Labor/time-wise, it is like installing both a microinverter system and a string inverter system together, soooooo....</div></div><div><div class="yiv1812548004MsoNormal"> </div></div><div><div class="yiv1812548004MsoNormal">benn</div></div><div><div class="yiv1812548004MsoNormal"><br><span style="">DayStar Renewable Energy Inc. </span> </div><div><div><div class="yiv1812548004MsoNormal"><span style=""><a rel="nofollow">benn@daystarsolar.ca</a></span></div></div><div><div class="yiv1812548004MsoNormal"><span style="">780-906-7807 </span></div></div><div><div class="yiv1812548004MsoNormal"><span style="">HAVE A SUNNY DAY </span></div></div></div></div></div></div><div class="yiv1812548004MsoNormal" style="margin-bottom: 12pt;"><br>_______________________________________________<br>List sponsored by Home Power magazine<br><br>List Address: <a rel="nofollow">RE-wrenches@lists.re-wrenches.org</a><br><br>Options
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