<font size=2 face="sans-serif">Hi:</font>
<br>
<br><font size=2 face="sans-serif">One thing to keep in mind with clipping,
(module over sizing), is that if a system has 10%-15% off clipping, that
will not affect total annual energy harvest and depending on dust and temperature
conditions will likely even improve it.</font>
<br>
<br><font size=2 face="sans-serif">Heres' a graph which shows the energy
harvest graphically for a 250W module with a 250W inverter and a and 300W
module with a 250W inverter.</font>
<br>
<br><img src=cid:_1_0C7FCB680C7FA7D000635D8188257DE8><font size=2 face="sans-serif">
</font>
<br><font size=2 face="sans-serif">Please note the graph does not include
any dust effects. To compensate for dust, the modules should always
be of the order of 4% more powerful than the inverter, unless you plan
on washing modules every month.</font>
<br>
<br><font size=2 face="sans-serif">Related to this, large commercial systems
we have been supplying inverters to are 30-70% oversized as the sinking
cost of modules makes the return on investment come out as maximized in
that range of oversizing,</font>
<br>
<br><font size=2 face="sans-serif">JARMO <br>
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<td><font size=1 color=#5f5f5f face="sans-serif">From:</font>
<td><font size=1 face="sans-serif">Drake <drake.chamberlin@redwoodalliance.org></font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">To:</font>
<td><font size=1 face="sans-serif">RE-wrenches <re-wrenches@lists.re-wrenches.org>,
</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Date:</font>
<td><font size=1 face="sans-serif">02/10/2015 06:51 AM</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Subject:</font>
<td><font size=1 face="sans-serif">Re: [RE-wrenches] 300W 72 cell micro
inverters</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Sent by:</font>
<td><font size=1 face="sans-serif">"RE-wrenches" <re-wrenches-bounces@lists.re-wrenches.org></font></table>
<br>
<hr noshade>
<br>
<br>
<br><tt><font size=2>That would be at the 120% rating, so by rule
of <br>
thumb, OK. I have a ground mount that has a <br>
ration of 1.15% with M-190s (figuring 199 W / <br>
inverter). It has quite a bit of clipping in the <br>
spring. It has optimized tilt for the location. A <br>
ballasted roof mount with a 10 or 15 degree tilt <br>
likely wouldn't have that issue.<br>
<br>
This system went in the spring of 2010, and has <br>
only had one M-190 failure out of 24, amazingly enough.<br>
<br>
At 10:22 AM 2/9/2015, you wrote:<br>
>What do you typically get out of a 300 watt panel for production when
you<br>
>are grid tied? I know in theory (STC) it is a 300 watt module but we<br>
>rarely if ever (except in very cold weather)see near that for an output.
I<br>
>use (as a general, 77 degrees F) design parameter, 77% for overall
power<br>
>production output output. I'm sure you would get a little clipping,
but I<br>
>guess a significant amount would depend on a number of variables on
the<br>
>site, time of the year, weather conditions, etc.<br>
><br>
>Daryl<br>
><br>
><br>
> > Yeah....if you're OK with a not insignificant amount of clipping
going on.<br>
> ><br>
> > -----Original Message-----<br>
> > From: RE-wrenches [</font></tt><a href="mailto:re-wrenches-bounces@lists.re-wrenches.org"><tt><font size=2>mailto:re-wrenches-bounces@lists.re-wrenches.org</font></tt></a><tt><font size=2>]
On<br>
> > Behalf Of penobscotsolar@midmaine.com<br>
> > Sent: Sunday, February 08, 2015 2:33 PM<br>
> > To: RE-wrenches<br>
> > Subject: Re: [RE-wrenches] 300W 72 cell micro inverters<br>
> ><br>
> > Hey Jason,<br>
> > The M-250's work well with LG 300 watt (60 cell)
modules.<br>
> ><br>
> > Daryl<br>
> ><br>
> ><br>
> >> Hi Jason,<br>
> >><br>
> >> The Enphase C250 Microinverters for three-phase commercial<br>
> >> applications does work with 72 cell modules.<br>
> >><br>
> >> On Sun, Feb 8, 2015 at 12:58 PM, Jason Szumlanski <<br>
> >> jason@floridasolardesigngroup.com> wrote:<br>
> >><br>
> >>> The ABB micros seem to be solid and easy to install.
We have two<br>
> >>> sites with them with no issues. Unfortunately, the monitoring
system<br>
> >>> sucks compared to Enphase and was far more difficult
to set up. I<br>
> >>> really wish Enphase would come up with a good 72 cell
option because<br>
> >>> we find ourselves competing with 300W modules occasionally,
and<br>
> >>> consumers (irrationally) jump to the conclusion that
bigger is<br>
> >>> better.<br>
> >>><br>
> >>><br>
> >>> [image: Logo-Sq-80.png]<br>
> >>><br>
> >>> Jason Szumlanski<br>
> >>><br>
> >>> Principal Solar Designer<br>
> >>><br>
> >>> Florida Solar Design Group<br>
> >>><br>
> >>> (239) 491-8010 office<br>
> >>><br>
> >>> (239) 410-4985 mobile<br>
> >>><br>
> >>> Authorized Sales Agent for Fafco Solar<br>
> >>><br>
> >>> [image: Fafco-Solar-Enphase-Logo.png]<br>
> >>><br>
> >>> License CVC56701<br>
> >>><br>
> >>><br>
> >>> On Sun, Feb 8, 2015 at 3:15 PM, Bill Hennessy <bill@berkssolar.com><br>
> >>> wrote:<br>
> >>><br>
> >>>> Hi folks--<br>
> >>>><br>
> >>>> We're planning a micro inverter install using 300W
72 cell modules<br>
> >>>> for an area with a fair amount of shading. The choices
we've found<br>
> >>>> are ABB micro<br>
> >>>> 0.3 or APS YC500A.<br>
> >>>> Any stories to tell about either of these or another
suggestion?<br>
> >>>><br>
> >>>> Thanks for your time.<br>
> >>>><br>
> >>>> Bill Hennessy<br>
> >>>> Berks Solar, LLC<br>
> >>>> 371 Centennial Rd<br>
> >>>> Mertztown, PA 19539<br>
> >>>><br>
> >>>> o 610 682 4300<br>
> >>>> c 484 560 4666<br>
> >>>> NABCEP certified installer<br>
> >>>> PA contractor #44411<br>
> >>>> </font></tt><a href=www.berkssolar.com><tt><font size=2>www.berkssolar.com</font></tt></a><tt><font size=2><br>
> >>>><br>
> >>>><br>
> >>>><br>
> >>>><br>
> >>>><br>
> >>>><br>
> >>>><br>
> >>>><br>
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> >>><br>
> >>><br>
> >>><br>
> >><br>
> >><br>
> >> --<br>
> >><br>
> >> Cordially,<br>
> >><br>
> >> Nick Soleil<br>
> >> *Enphase Energy* | Field Applications Engineer<br>
> >><br>
> >> office 707-763-4784 <%28707%29%20763.%204784> x7267
cell 07-321-2937<br>
> >><br>
> >> <</font></tt><a href=http://enphase.com/><tt><font size=2>http://enphase.com/</font></tt></a><tt><font size=2>><br>
> >><br>
> >> *Powering Whatâ\u201a\u201es Next*â\u20ac\u017e¢* | *The Enphase
Energy Management<br>
> >> System<br>
> >> <</font></tt><a href=http://ow.ly/HbVS3><tt><font size=2>http://ow.ly/HbVS3</font></tt></a><tt><font size=2>>
<</font></tt><a href=http://community.enphaseenergy.com/><tt><font size=2>http://community.enphaseenergy.com/</font></tt></a><tt><font size=2>><br>
> >> <</font></tt><a href=http://facebook.com/EnphaseEnergy><tt><font size=2>http://facebook.com/EnphaseEnergy</font></tt></a><tt><font size=2>><br>
> >> <</font></tt><a href=http://twitter.com/Enphase><tt><font size=2>http://twitter.com/Enphase</font></tt></a><tt><font size=2>><br>
> >> <</font></tt><a href="http://linkedin.com/company/enphase-energy"><tt><font size=2>http://linkedin.com/company/enphase-energy</font></tt></a><tt><font size=2>><br>
> >><br>
> >><br>
> >> NABCEP Certified Solar PV Installer #03262011-300<br>
> >><br>
> >> California C10 Licensed Electrician #986315<br>
> >><br>
> >> Texas Master Electrician #284451<br>
> >><br>
> >> <nsoleil@enphaseenergy.com><br>
> >><br>
> >> â\u201a\u201cDonâ\u201a\u201et get me wrong: I love nuclear energy!
Itâ\u201a\u201es<br>
> >> just that I<br>
> >> prefer fusion to fission. And it just so happens that thereâ\u201a\u201es
an<br>
> >> enormous fusion reactor safely banked a few million miles
from us. It<br>
> >> delivers more than we could ever use in just about 8 minutes.
And<br>
> >> itâ\u201a\u201es wireless!â\u201a<br>
> >><br>
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