[RE-wrenches] parallel stacking SW

[William Miller]

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
<http://www.millersolar.com/MillerSolar/case_studies/case_studies.html>  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
<http://www.millersolar.com/MillerSolar/case_studies/pv_school/pv_school_wir
ing_digrams.html>   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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