[RE-wrenches] 300W 72 cell micro inverters

Jarmo.Venalainen at schneider-electric.com Jarmo.Venalainen at schneider-electric.com
Tue Feb 10 10:05:05 PST 2015 

Hi:

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.

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.

 
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.

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,

JARMO 
_____________________________________________________________________________________ 


Jarmo Venalainen  |   Schneider Electric   |  Xantrex Brand  |   CANADA  | 
  Sales Application Engineer 
Phone: +604-422-2528  |   Tech Support: 800-670-0707  |   Mobile: 
+604-505-0291 
Email: jarmo.venalainen at schneider-electric.com  |   Site: www.Xantrex.com 
|   Address: 3700 Gilmore Way, Burnaby, BC V5G4M1 








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From:
Drake <drake.chamberlin at redwoodalliance.org>
To:
RE-wrenches <re-wrenches at lists.re-wrenches.org>, 
Date:
02/10/2015 06:51 AM
Subject:
Re: [RE-wrenches] 300W 72 cell micro inverters
Sent by:
"RE-wrenches" <re-wrenches-bounces at lists.re-wrenches.org>



That  would be at the 120% rating, so by rule of 
thumb, OK. I have a ground mount that has a 
ration of 1.15% with M-190s (figuring 199 W / 
inverter). It has quite a bit of clipping in the 
spring. It has optimized tilt for the location. A 
ballasted roof mount with a 10 or 15 degree tilt 
likely wouldn't have that issue.

This system went in the spring of 2010, and has 
only  had one M-190 failure out of 24, amazingly enough.

At 10:22 AM 2/9/2015, you wrote:
>What do you typically get out of a 300 watt panel for production when you
>are grid tied? I know in theory (STC) it is a 300 watt module but we
>rarely if ever (except in very cold weather)see near that for an output. 
I
>use (as a general, 77 degrees F) design parameter, 77% for overall power
>production output output. I'm sure you would get a little clipping, but I
>guess a significant amount would depend on a number of variables on the
>site, time of the year, weather conditions, etc.
>
>Daryl
>
>
> > Yeah....if you're OK with a not insignificant amount of clipping going 
on.
> >
> > -----Original Message-----
> > From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] 
On
> > Behalf Of penobscotsolar at midmaine.com
> > Sent: Sunday, February 08, 2015 2:33 PM
> > To: RE-wrenches
> > Subject: Re: [RE-wrenches] 300W 72 cell micro inverters
> >
> > Hey Jason,
> >    The M-250's work well with LG 300 watt (60 cell) modules.
> >
> > Daryl
> >
> >
> >> Hi Jason,
> >>
> >> The Enphase C250 Microinverters for three-phase commercial
> >> applications does work with 72 cell modules.
> >>
> >> On Sun, Feb 8, 2015 at 12:58 PM, Jason Szumlanski <
> >> jason at floridasolardesigngroup.com> wrote:
> >>
> >>> The ABB micros seem to be solid and easy to install. We have two
> >>> sites with them with no issues. Unfortunately, the monitoring system
> >>> sucks compared to Enphase and was far more difficult to set up. I
> >>> really wish Enphase would come up with a good 72 cell option because
> >>> we find ourselves competing with 300W modules occasionally, and
> >>> consumers (irrationally) jump to the conclusion that bigger is
> >>> better.
> >>>
> >>>
> >>> [image: Logo-Sq-80.png]
> >>>
> >>> Jason Szumlanski
> >>>
> >>> Principal Solar Designer
> >>>
> >>> Florida Solar Design Group
> >>>
> >>> (239) 491-8010 office
> >>>
> >>> (239) 410-4985 mobile
> >>>
> >>> Authorized Sales Agent for Fafco Solar
> >>>
> >>> [image: Fafco-Solar-Enphase-Logo.png]
> >>>
> >>> License CVC56701
> >>>
> >>>
> >>> On Sun, Feb 8, 2015 at 3:15 PM, Bill Hennessy <bill at berkssolar.com>
> >>> wrote:
> >>>
> >>>> Hi folks--
> >>>>
> >>>> We're planning a micro inverter install using 300W 72 cell modules
> >>>> for an area with a fair amount of shading. The choices we've found
> >>>> are ABB micro
> >>>> 0.3 or APS YC500A.
> >>>> Any stories to tell about either of these or another suggestion?
> >>>>
> >>>> Thanks for your time.
> >>>>
> >>>> Bill Hennessy
> >>>> Berks Solar, LLC
> >>>> 371 Centennial Rd
> >>>> Mertztown, PA 19539
> >>>>
> >>>> o 610 682 4300
> >>>> c 484 560 4666
> >>>> NABCEP certified installer
> >>>> PA contractor #44411
> >>>> www.berkssolar.com
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
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