[RE-wrenches] parallel stacking SW

[Mac Lewis]

Wrenches,
Nick, you are right it is a 5548.  I like the separation idea and have
investigated this, but each bus feeds separate homes that are quite a
distance away.

Alan, I forgot to mention that they often get nuisance overcurrent errors
on each phase of the heavily used inverters. That was why I was interested
in putting the under-utilized equipment to use.  From my research it looks
like this is not possible with this equipment.

Thanks


On Wed, Oct 2, 2013 at 9:38 AM, Allan Sindelar <
allan at positiveenergysolar.com> wrote:

>  Mac,
> Trace made both the SWI/PAR parallel stacking and a series stacking cable.
> I don't know if stacking four units in series/parallel is possible. I never
> investigated it, and the manual (Rev. 4.01) doesn't address it. I suspect
> that it's not possible, from this section on page 96:
>
> The parallel stacking interface cable (SWI/PAR) simply plugs into the
> stacking port on the left end of each
> inverter and allows the two inverters to operate as a single inverter. The
> interface method is based on the
> series stacking system offered for the SW Series inverters since their
> introduction for the North American
> market. The parallel stacking system operates the inverters in phase by
> having one of the inverters
> operate as the MASTER and the other as a SLAVE. When an AC source is
> connected, the MASTER first
> synchronizes to the AC source, then connects to it and battery charges.
> Since the SLAVE follows the
> master and is set-up with a longer warm-up delay, the SLAVE inverter is
> already synchronized when it
> transfers the loads and starts battery charging. This allows very smooth
> transitions from inverter mode to
> charger mode.
>
> I'd interpret this to mean that the SWI/PAR cable uses the only stacking
> port available.
>
> But the bigger issue is this: must you change it? It doesn't matter that
> one pair works hard and the other rests unless the hardworking pair aren't
> up to the job. Unless you have overload shutdowns, there's no benefit to
> parallel stacking, and you're messing with obsolete legacy hardware that's
> not supported and for which parts and service will be difficult to obtain
> (good luck finding a pair of SWI/PAR cables...). I'd advise against
> changing the system configuration if there are no problems now - it sounds
> like a solution in search of a problem.
>
> Just my $.02...
> Allan
>
>  ** ** ** ** **
>
> *Allan Sindelar*
> *Allan at positiveenergysolar.com* <Allan at positiveenergysolar.com>
> NABCEP Certified PV Installation Professional
> NABCEP Certified Technical Sales Professional
> New Mexico EE98J Journeyman Electrician
> Founder, *Positive Energy, Inc.*
>
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> ****3209 Richards Lane**
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>
>
>  **********
> On 10/2/2013 9:01 AM, Mac Lewis wrote:
>
> Hi wrenches,
>
>  I have some folks that I'm meeting in a couple of days that have 4 Trace
> SW 5048 inverters.  It's a very large, older compound-style installation
> that the original installer has bailed on.  They have it set up so that
> there is a common battery bank and each pair of series stacked inverters
> are independently feeding 2 separate 120/240 busses.  One of these 120/240
> services gets utilized very heavily, and one isn't really used at all.  Is
> it possible with this type of inverter, to have all four inverters feeding
> a common AC bus, two feed Phase A and the other two feeding phase B?
>
>  I know that is possible to series stack and to parallel stack this
> inverter, but can you do both at the same time?
>
>  If so, does anyone have a pin out to a parallel stacking cable?
>
>  Thanks in advance
>
>  --
>
>
>
>  Mac Lewis
>
> *
>
> "Yo solo sé que no sé nada." -Sócrates
> *
>
>
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-- 



Mac Lewis

*

"Yo solo sé que no sé nada." -Sócrates
*
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