Carl:
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.
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.
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.
Respectfully,
William Miller
PS: Printer cables were never DB25-DB25. They were DB25 to Centronics.
Wm
At 10:01 AM 3/31/2009, you wrote:
William,
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.
Carl Hansen
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