<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif">Interesting comment - we have thousands of M215's in service with an extremely low failure rate (maybe 1 or 2). I have purposefully not started installing M250's because the M215 seems like a low risk and I'm waiting for good pricing on 280W, 60 cell modules. It's not exactly off-topic, as there seems to be evidence that a higher module rating/inverter rating ratio results in more energy harvest, presumably in part due to inverter efficiency increasing as the input power increases. That's why I have been reluctant to put 250-265W modules on the M250.</div>
<br><br><div id="WISESTAMP_SIG_gmail_session" href="http://WISESTAMP_SIG_gmail_session"><div style="font-size:13px;font-family:Verdana,Arial,Helvetica,sans-serif"><div style="margin:0 0 8px 0"><p style="margin:0"><span><span>Jason Szumlanski</span></span></p>
<p style="margin:0"><span><span></span></span></p><div class="gmail_default" style="font-family:verdana,sans-serif;display:inline">Fafco Solar</div><p></p><p style="margin:0"><span><span></span></span></p><div class="gmail_default" style="font-family:verdana,sans-serif;display:inline">
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<br><br><div class="gmail_quote">On Tue, Aug 26, 2014 at 1:59 AM, Jerry Shafer <span dir="ltr"><<a href="mailto:jerrysgarage01@gmail.com" target="_blank">jerrysgarage01@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<p dir="ltr">Why dont you use the m250 anyway as the 250's so far are more reliable then the 215 have been. A little off topic i know.</p>
<div class="gmail_quote"><div><div class="h5">On Aug 25, 2014 1:41 PM, "Jason Szumlanski" <<a href="mailto:jason@fafcosolar.com" target="_blank">jason@fafcosolar.com</a>> wrote:<br type="attribution"></div>
</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5">
<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif">I had a tough customer recently that grilled me on how we can put a 270W solar module on a 215W inverter. Fortunately, Enphase has a wonderful white paper on the subject. However, it got me thinking... Enphase has demonstrated that higher output panels in many climates (hot SW Florida included) can benefit from modules that far exceed the inverter rating, and even exceed the inverter's "recommended input" rating. Enphase has shown that 270W+ modules can show energy harvest on the M215 where it makes sense to "oversize" the module.</div>
<div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">I also received a similar query from a rather uninformed plan reviewer in an area AHJ along similar lines. Fortunately I was within the "recommended input" rating on the spec sheet of 270W with a 265W module, but I wonder what would happen if I had paired the M215 with a 280W module on my plans, which are becoming readily available now in 60 cell modules with 300W modules on the near horizon. I'm pretty sure my plan would have been kicked back for exceeding the manufacturer's recommendation.</div>
<div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">My question, which applies to string inverters and microinverters, is how much is too much, what would happen if you paired an array that far exceeded the rating, and how do inverter manufacturers determine the recommended and/or maximum rating of the connected module or array? Also, why do some manufacturers have a simple recommendation while others have a "maximum" rating?</div>
<br><br><div href="http://WISESTAMP_SIG_gmail_session"><div style="font-size:13px;font-family:Verdana,Arial,Helvetica,sans-serif"><div style="margin:0 0 8px 0"><p style="margin:0"><span><span>Jason Szumlanski</span></span></p>
<p style="margin:0"><span><span></span></span></p><div class="gmail_default" style="font-family:verdana,sans-serif;display:inline">Fafco Solar</div><br><p></p><div style="clear:both"></div></div><img src="https://wisestamp.appspot.com/pixview.gif?p=chrome&v=3.44.0&t=1409009327256&u=ea7a5e30140ce271" width="1" height="1"></div>
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