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 < [email protected]> 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* > *[email protected]* <[email protected]> > NABCEP Certified PV Installation Professional > NABCEP Certified Technical Sales Professional > New Mexico EE98J Journeyman Electrician > Founder, *Positive Energy, Inc.* > > A Certified B CorporationTM > ****3209 Richards Lane** > **Santa Fe**, **New Mexico** **87507**** > *505 424-1112 office 780-2738 cell* > *www.positiveenergysolar.com* <http://www.positiveenergysolar.com/>**** > > > ********** > 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 > * > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: [email protected] > > Change email address & > settings:http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette:www.re-wrenches.org/etiquette.htm > > Check out participant bios:www.members.re-wrenches.org > > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: [email protected] > > Change email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > > -- Mac Lewis * "Yo solo sé que no sé nada." -Sócrates *
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