[RE-wrenches] fronius IG Plus practical engineering WAA???

[Phil Undercuffler]

They added a special listing, where they were able to expand the range of
their heavy duty switch when used in PV direct applications. The special PV
listing doesn't void the standard wiring methods, however.  You can still
run the full 30 amps (24 * 1.25) through two poles series connected, or you
can bring multiple subarrays through each of the poles, each with a lower
individual Isc limit but with an aggregate higher current capacity.
This really becomes handy on the larger 60 and 100A disconnects.  Suddenly,
a 3 pole 100A disconnect can be used for three large subarrays to a central
inverter, which saves considerably on BOS costs.  Also, be aware that (the
last I looked) the special listing doesn't apply to their 200A and larger
disconnects.


Phil Undercuffler

--------




On Sat, Jun 27, 2009 at 9:22 PM, Darryl Thayer <daryl_solar at yahoo.com>wrote:

>
> Again this is FMI for my information, Did not Square D change there rating
> for PV systems?
> Darryl
>
> --- On Fri, 6/26/09, Phil Undercuffler <solarphil at gmail.com> wrote:
>
> > From: Phil Undercuffler <solarphil at gmail.com>
> > Subject: Re: [RE-wrenches] fronius IG Plus practical engineering WAA???
> <snip>
> >
> > This confirmed my understanding
> > that the limiting factor
> > on the 30A switch
> >
> > in a photovoltaic applications is
> > not 30A * 0.8.  The limiting factor
> > is 18A
> >
> > per pole or 11.5A Isc per pole.
> >
> > <unsnip>
> >
> >
> >
> > To clarify – the 18A per pole /
> > 11.5A Isc per pole only
> > applies if you are using the limited listing for PV
> > applications, with one
> > string or subarray per pole.  If you
> > wire
> > the HU361RB disconnect with two poles connected in series,
> > then you may run the
> > switch at 100% of its rating.
> >
> >
> >
> > Therefore, you can stuff up to 24
> > amps Isc (24 * 1.25 =
> > 30) through a single disconnect if the poles are wired in
> > series, or you can
> > run 3 subarrays each with no more than 11.5A per pole if
> > wired in
> > parallel.
> >
> >
> >
> > Sometimes it’s good to have
> > options.
> >
> >
> >
> >
> >
> >
> >
> > Phil Undercuffler
> >
> > Director, Battery-based and
> > Off-grid
> >
> > Distribution Sales Group
> >
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> >
> > Our World Is Full of Energy
> >
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> >
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> > Fe, NM  87507
> >
> > p.undercuffler at conergy.us
> >
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> > |
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> >
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> >
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> >
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> >
> >
> >
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> >
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