<!doctype html public "-//W3C//DTD W3 HTML//EN">
<html><head><style type="text/css"><!--
blockquote, dl, ul, ol, li { padding-top: 0 ; padding-bottom: 0 }
--></style><title>Re: [RE-wrenches] Trace SW Stacking
Cable?</title></head><body>
<div>Hi William and All,</div>
<div><br></div>
<div>Thanks to all for the offers and clarifications. I may have
located a cable locally and if not will probably make one up per
William's and Phil's instructions. </div>
<div><br></div>
<div>And as William and others have said - do not use anything
as an SWI cable unless you know it's an original SWI cable or have
made up the cable yourself according to the original SW pin out
diagrams.</div>
<div><br></div>
<div>Thanks again for all the support.</div>
<div><br></div>
<div>Best,</div>
<div><br></div>
<div>Jeff</div>
<div><br></div>
<div><br></div>
<div><br></div>
<blockquote type="cite" cite>Carl:<br>
</blockquote>
<blockquote type="cite" cite>I have checked with Xantrex. I
would not make a declaration on the Wrenches forum to my esteemed
colleagues unless I was quite certain. Find the "SWI
Stacking Cable wiring diagram" on our web site at:
http://millersolar.com/resources/resources.html under
"Manufacturer's data". This diagram came directly from
a Xantrex engineer. I have no reason to doubt it's authenticity.
This is not the pin out for a "standard" DB25 cable.
Not also the link just below it for "Not an SWI cable"
This is your "standard" cable. I fished this out of my
attic this evening and scanned it still in the package. Note it
is listed as a "straight through" cable. This means
pin 1 connects to pin 1, pin 2 to pin 2, etc. This is not the
same wiring as depicted in the SWI stacking cable diagram.<br>
<br>
I believe you have suggested twice that solar installers grab the
nearest "standard" DB25 cable and give it a try. I
feel compelled to correct the record publicly. These are not the
same cables and unspecified damage could occur. I know I once
shorted out a sync cable for Heart Interface inverters and blew two of
them up catastrophically two days before Christmas. It was a
very unpleasant surprise for the client (who had guests coming) and
for my self. These cables are a direct link to the FET control
circuits and need to be treated with the utmost caution.<br>
<br>
I don't know what would happen to two SW inverters if connected with
your straight through cable, but I recommend strongly against trying
it. Please do not recommend practices unless you are quite
certain they will cause no harm.<br>
<br>
<br>
Respectfully,<br>
<br>
William Miller<br>
<br>
PS: Printer cables were never DB25-DB25. They were DB25 to
Centronics.<br>
<br>
Wm<br>
<br>
<br>
<br>
<br>
<br>
At 10:01 AM 3/31/2009, you wrote:<br>
<blockquote type="cite" cite><font face="Arial" size="-1">William,<br>
</font> <br>
<font face="Arial" size="-1"> I used an off the shelf cable to
use with the SW and PS remote, it was a double male ended 25 pin
cable. They were formally used as printer/computer cables. I believe
the stacking cable is the same style. You could check with
Xantrex.<br>
</font> <br>
<font face="Arial" size="-1"> Carl Hansen</font><br>
</blockquote>
</blockquote>
<blockquote type="cite" cite><br>
_______________________________________________<br>
List sponsored by Home Power magazine<br>
<br>
List Address: RE-wrenches@lists.re-wrenches.org<br>
<br>
Options & settings:<br>
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org<br
>
<br>
List-Archive:
http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org<br>
<br>
List rules & etiquette:<br>
www.re-wrenches.org/etiquette.htm<br>
<br>
Check out participant bios:<br>
www.members.re-wrenches.org</blockquote>
<div><br></div>
<div><br></div>
<x-sigsep><pre>--
</pre></x-sigsep>
<div>~~~~~~~~~~~~~<br>
Jeff Clearwater<br>
Senior Design Engineer<br>
NABCEP (tm) Certified Solar PV Installer<br>
http://www.nabcep.org/<br>
Village Power Design/NorthEast Solar Design<br>
Turnkey Solar Design & Installation for the Commercial Sector<br>
http://www.villagepower.com<br>
gosolar@villagepower.com<br>
<br>
Voice: 413-259-3750<br>
Fax: 413-825-0703<br>
65 Schoolhouse Rd<x-tab>
</x-tab><br>
Amherst, MA 01002<br>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</div>
</body>
</html>