[RE-wrenches] fronius IG Plus practical engineering WAA???
Darryl Thayer
daryl_solar at yahoo.com
Sat Jun 27 21:01:21 PDT 2009
If I use the Hu361 (unfused) it has the 30 amp rating, the 80% reduction only applies if I use fuses per the continuous operation derating for overcurrent devices. The switch is not a conductor or overcurrent device. If I use the H361 (fused) then the 80% derate applies, (24 amps) and if I use the double break I am limited to 18 amps in all cases.
Darryl
Correct?
--- On Sat, 6/27/09, Phil Undercuffler <solarphil at gmail.com> wrote:
> From: Phil Undercuffler <solarphil at gmail.com>
> Subject: Re: [RE-wrenches] fronius IG Plus practical engineering WAA???
> To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
> Date: Saturday, June 27, 2009, 10:47 PM
> 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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> >
>
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>
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>
> >
>
> > Santa
>
> > Fe, NM 87507
>
> >
>
> > p.undercuffler at conergy.us
>
> >
>
> > Direct
>
> > |
>
> > 505.216.3841
>
> >
>
> > Toll Free | 888.396.6611 x4841
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>
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>
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>
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>
> >
>
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