amorphous pv & high voltage arrays [RE-wrenches]
Jerry Caldwell
solarcowboy at yahoo.com
Tue Feb 26 17:21:51 PST 2002
Matt,
The reason I ask this is because I know of a company
here in California that is in the process of re-wiring
some of their high voltage amorphous arrays because of
the decline in voltage over the attenuation period. I
understand that it is common practice to leave modules
out of strings and connect them after they attenuate.
The system I mention utilizes Trace Tech industrial
inverters. Has anyone on the list done a Sunny Boy
system with any amorphous pv? Is there anything to
watch out for that is different than crystalline
arrays?
Jerry Caldwell
L.E.S.
--- Matt Lafferty <pvpro at attbi.com> wrote:
> Jerry asks:
>
> > What kinds of problems are you encountering that
> are
> > exclusive to thin film arrays? Are these problems
> due
> > to the fact that amorphous pv produces higher
> voltages
> > during it's breaking in period?
>
> > Jerry Caldwell
> > Light Energy Systems
>
> Good question. We have encountered Zero issues with
> regard to "breaking
> in". This is one of the misunderstandings that
> still exists relating to
> thin-films. (Oh, God, I feel a "book" coming on!)
>
> The differences between thin-film arrays and
> crystalline are many, some
> positive and others not so positive.
>
> The higher voltage of the thin-films is one of the
> positives. This requires
> less modules in series to achieve high-voltage
> configurations, and
> therefore, greater flexibility in sizing.
>
> The two most significant differences are:
>
> 1. The Series Fuse Rating of thin-films requires
> more fusing and combining
> than with crystalline.
> 2. The larger surface area required to accomodate
> an array reduces the
> number of candidate sites.
>
> Thin films are incredibly more forgiving in the
> heat, shade, non-perfect
> orientations, fog, cloudy days, etc.
>
> My personal perspective is that they are different
> technologies with
> different characteristics. They each have their
> place and, therefore,
> should be evaluated on their strengths to determine
> the appropriate
> application for the candidate site.
>
> Pray for Sun!
>
> -Matt Lafferty
> pvpro at attbi.com
>
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