<div dir="ltr">Wrenches,<div>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.<br><div><br></div><div>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.</div>
</div><div><br></div><div>Thanks</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, Oct 2, 2013 at 9:38 AM, Allan Sindelar <span dir="ltr"><<a href="mailto:allan@positiveenergysolar.com" target="_blank">allan@positiveenergysolar.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<div>Mac,<br>
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:<br>
<blockquote>The parallel stacking interface cable (SWI/PAR) simply
plugs into the stacking port on the left end of each<br>
inverter and allows the two inverters to operate as a single
inverter. The interface method is based on the<br>
series stacking system offered for the SW Series inverters since
their introduction for the North American<br>
market. The parallel stacking system operates the inverters in
phase by having one of the inverters<br>
operate as the MASTER and the other as a SLAVE. When an AC
source is connected, the MASTER first<br>
synchronizes to the AC source, then connects to it and battery
charges. Since the SLAVE follows the<br>
master and is set-up with a longer warm-up delay, the SLAVE
inverter is already synchronized when it<br>
transfers the loads and starts battery charging. This allows
very smooth transitions from inverter mode to<br>
charger mode.<br>
</blockquote>
I'd interpret this to mean that the SWI/PAR cable uses the only
stacking port available.<br>
<br>
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.<br>
<br>
Just my $.02...<br>
Allan<br>
<br>
<div>
<u></u>
<u></u>
<u></u>
<u></u>
<u></u>
<div>
<p class="MsoNormal"><b>Allan <span>Sindelar</span></b><br>
<span style="font-size:10.0pt"><a href="mailto:Allan@positiveenergysolar.com" target="_blank"><u><span style="color:#000099">Allan@positiveenergysolar.com</span></u></a></span><br>
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Installation Professional<br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
Founder, <b>Positive Energy, Inc.<u></u><u></u></b></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt">A
Certified B <span>Corporation<sup><span style="font-size:7.5pt">TM</span></sup></span><br>
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</div>
<u></u><u></u><u></u><u></u><u></u></div><div><div class="h5">
On 10/2/2013 9:01 AM, Mac Lewis wrote:<br>
</div></div></div>
<blockquote type="cite"><div><div class="h5">
<div dir="ltr">Hi wrenches,
<div><br>
</div>
<div>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?</div>
<div><br>
</div>
<div>I know that is possible to series stack and to parallel
stack this inverter, but can you do both at the same time?</div>
<div><br>
</div>
<div>If so, does anyone have a pin out to a parallel stacking
cable?</div>
<div><br>
</div>
<div>Thanks in advance</div>
<div>
<div><br>
</div>
-- <br>
<div><br>
</div>
<div><font face="'times new roman', serif" color="#305A78"><br>
</font></div>
<div><br>
</div>
Mac Lewis<br>
<br>
<span><b><font face="Arial, Helvetica, sans-serif" size="3">
<p align="left">
<font face="Verdana, Arial, Helvetica, sans-serif" color="#000000"><span style="font-size:small"><span style="font-family:arial;font-weight:normal;color:rgb(48,90,120)"><font face="'times new roman', serif">"Yo solo s
que no s nada."</font><span style="font-weight:700;color:rgb(104,104,104)"><font face="'times new roman', serif">-Scrates</font></span></span></span></font></p>
</font></b></span>
</div>
</div>
<br>
<fieldset></fieldset>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div><br></div><div><font color="#305A78" face="'times new roman', serif"><br></font></div><div><br></div>Mac Lewis<br><br><span style="font-family:'Times New Roman';font-size:medium;color:rgb(255,153,0)"><b><font face="Arial, Helvetica, sans-serif" size="3"><p align="left">
<font color="#000000" face="Verdana, Arial, Helvetica, sans-serif"><span style="font-size:small"><span style="font-family:arial;font-weight:normal;color:rgb(48,90,120)"><font face="'times new roman', serif">"Yo solo s que no s nada."</font><span style="font-weight:700;color:rgb(104,104,104)"><font face="'times new roman', serif">-Scrates</font></span></span></span></font></p>
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