[RE-wrenches] Clipping of microinverter output

[Will White]

Mike,

Have you read the Enphase white paper on module to inverter size?  It goes
into good detail on why they do it.

http://www2.enphase.com/global/files/Enphase_White_Paper_Module_Rightsizing.pdf

Thanks,
Will


-- 
*Will White*
Curriculum Developer

e: will at solarenergy.org
w: www.solarenergy.org
p: 802-272-3092

PV Installation Professional
# 093006-34

On Mon, Oct 3, 2016 at 10:20 PM, Mike Kocsmiersky <mikek at spiritsolar.net>
wrote:

> Recently I’ve been concerned about power clipping of micro inverters and
> the design ratio of PV STC array size to inverter.  If I have a 300W module
> going into a 250W micro inverter, there will be times when the potential
> power output is clipped because the micro inverter can’t handle all the
> power.  I’m thinking cold day with 1000W/m2 irradiance.  It is typical
> nowadays to have an STC array size to inverter ratio of 1.2.  Have you seen
> any analysis on how much energy is clipped, vs how much energy output is
> increased by operating at a better efficiency spot on the micro inverter?
> This assumes that the micro inverter performs better when more fully loaded.
>
> Additionally over time the crystalline silicon module will degrade
> slightly as well, reducing the amount of power clipping.
>
>
>
> I welcome your thoughts.
>
>
>
>
>
> Mike Kocsmiersky
>
> Principal
>
> Phone: 413 883-3144
>
> *Spirit Solar*
>
> www.SpiritSolar.net
>
>
>
>
>
> _______________________________________________
> List sponsored by Redwood Alliance
>
> List Address: RE-wrenches at lists.re-wrenches.org
>
> Change listserver email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
> List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.
> org/maillist.html
>
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
>
> Check out or update participant bios:
> www.members.re-wrenches.org
>
>
>


-- 
*Will White*
Curriculum Developer

e: will at solarenergy.org
w: www.solarenergy.org
p: 802-272-3092

PV Installation Professional
# 093006-34
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20161004/f7f5f185/attachment-0002.html>