[RE-wrenches] parallel stacking SW

Fri Oct 4 10:02:56 PDT 2013

Hi William,
In theory, this would be possible, but you have to consider the 60A 
transfer relay rating, so if we are dealing with SW5548 (5.5kW) models,
you will only add approx 1700W of power (per set) before nuisance tripping 
a 60A breaker.
Rgds,
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From:
"William Miller" <william at millersolar.com>
To:
"'RE-wrenches'" <re-wrenches at lists.re-wrenches.org>
Date:
10/03/2013 10:49 PM
Subject:
Re: [RE-wrenches] parallel stacking SW
Sent by:
re-wrenches-bounces at lists.re-wrenches.org

Mac:

I approached this problem some years ago and posted about it on this 
forum. What I heard is that, yes, it can be done.  The actual process is 
known by a few former Trace engineers and could not be divulged due to 
confidentiality agreements signed when Outback split off from Xantrex (or 
Trace, if that is what it was called at the time).  If you know a former 
Trace Engineer, you might be able to wrest the information out of them if 
the stature of limitations has expired.

Of course I was not satisfied with “this information is only is for some 
to know,” so I worked on the problem.  My idea is to connect two inverters 
in series and then feed them into the AC1 inputs of two more inverters in 
parallel.  Since the SW inverters can provide true “Gen Support” mode, the 
downstream inverters can assist the upstream inverters, therefore 
providing the gross power of all four inverters.  See this page for a 
drawing.    Look about halfway down the page for Cascading SW inverters.

Now I have come up with some pretty strange ideas in my time, but I think 
this is one of the more wacky, but actually possible solutions.  I never 
had the chance to test this scheme, but I would love to know if it would 
actually work.

William

PS:  Just as I was finishing this email I remembered the situation I was 
trying to correct. The other idea is here:  Link  I don’t recommend this 
technique for the reasons stated on the web site, but there may the germ 
of an idea that may work.  It would have to do with feeding a transformer 
from opposite ends with paralleled inverters.  How to keep them in sync…

Good Luck,

William Miller

From: re-wrenches-bounces at lists.re-wrenches.org [
mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Mac Lewis
Sent: Wednesday, October 02, 2013 8:01 AM
To: RE-wrenches
Subject: [RE-wrenches] parallel stacking SW

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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