[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
> 
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> 
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> 
> >
> 
> > p.undercuffler at conergy.us
> 
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> 
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> 
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