[RE-wrenches] Clipping of microinverter output

[Jerry Shafer]

Over driving inverters is nothing new, l have seen shops with the old
sma2500 push them to 3500 dc and still keep them under max voc and sure
there will be some mid day clipping but the AM and PM increase are where
the meat is. For the loss in cream off the top at mid day you get a bunch
more power thtought the day.

On Oct 3, 2016 4:20 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
>
>
>
>
>
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