[RE-wrenches] GridBoss with Multiple FlexBoss Parallel Comms

Mon Oct 6 03:00:26 PDT 2025

I see that diagram in the manual, but it is still strange to me that you
need two cables. It seems redundant to make a loop like this. The FlexBoss
manual has a similar diagram for paralleling inverters (without the
GridBoss), but it states:

*If only two inverters are installed only one parallel cable is
required. Two parallel cables will provide redundancy in the event one
cable is disconnected or stops working.*

I don't think I have ever seen something like that with Cat5 wiring. I
would think it would cause more problems than it would solve.

I'm going to run two cables today, but I will try just one to see if it
works. I'll let you know.

Jason Szumlanski
Principal Solar Designer | Florida Solar Design Group
NABCEP Certified Solar Professional (PVIP)
Florida State Certified Solar Contractor CVC56956
Florida Certified Electrical Contractor EC13013208

On Sun, Oct 5, 2025 at 5:36 PM Brett Stigile via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Jasson
>
> I just did a GridBoss job.  Two cat5 cables are needed between Inverters
> and GridBoss.  See diagrams on Gridboss manual page 36 and 37.
>
> One very useful thing I found was the extra help when commissioning the
> system for the first time.  You can log into PowerStation go to Forms
> then schedule a conference call.  Through the conference call you can
> simply share your screen and they can walk you through the last few
> details.
>
>
> ---
> Brett Stigile
> Owner/Renewable Energy Electrician
> 503-317-7950
> brett at oregonsunwrangler.com
>
> Oregon Sun Wrangler LLC
> CCB: 240661
> License: 66LRT
> NABCEP PV Installation Professional
> certification: PV 100414-008123
>
> On 2025-10-05 14:02, re-wrenches-request at lists.re-wrenches.org wrote:
> > Send RE-wrenches mailing list submissions to
> >       re-wrenches at lists.re-wrenches.org
> >
> > To subscribe or unsubscribe via the World Wide Web, visit
> >
> http://lists.re-wrenches.org/listinfo.cgi/re-wrenches-re-wrenches.org
> > or, via email, send a message with subject or body 'help' to
> >       re-wrenches-request at lists.re-wrenches.org
> >
> > You can reach the person managing the list at
> >       re-wrenches-owner at lists.re-wrenches.org
> >
> > When replying, please edit your Subject line so it is more specific
> > than "Re: Contents of RE-wrenches digest..."
> >
> >
> > When responding to posts within the Digest, be sure to restore the
> > Subject: line to the exact original, and please edit out any extraneous
> > lines from the quoted message.
> >
> >
> >
> > Today's Topics:
> >
> >    1. GridBoss with Multiple FlexBoss Parallel Comms (Jason Szumlanski)
> >
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Sun, 5 Oct 2025 09:31:27 -0400
> > From: Jason Szumlanski <jason at floridasolardesigngroup.com>
> > To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
> > Subject: [RE-wrenches] GridBoss with Multiple FlexBoss Parallel Comms
> > Message-ID:
> >       <CAE438R_qdxegn1OxZRF+u+zE9=P1DBUJoCSAij+8EUv4LM=
> 6eQ at mail.gmail.com>
> > Content-Type: text/plain; charset="utf-8"
> >
> > The manual seems to indicate diagrammatically that a Cat5 cable is
> > required
> > between the GridBoss and each FlexBoss inverter, but the text seems to
> > indicate only a single Cat5 wire is required between the GridBoss and
> > master FlexBoss.
> >
> > Can anyone confirm if a single Cat5 will work?
> >
> > I have a 100 foot run from the GridBoss to my inverters. I'm thinking
> > about
> > using a single Cat5 cable for comms and a CL3R cable for the RSD
> > connection
> > through the attic.
> >
> > Obviously, the included parallel cable should be used between the
> > inverters. I get that part.
> >
> > Jason Szumlanski
> > Florida Solar Design Group
> > -------------- next part --------------
> > An HTML attachment was scrubbed...
> > URL:
> > <
> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20251005/6540f807/attachment-0001.htm
> >
> >
> > ------------------------------
> >
> > Subject: Digest Footer
> >
> > _______________________________________________
> > List sponsored by Redwood Alliance
> >
> > Pay optional member dues here: http://re-wrenches.org
> >
> > List Address: RE-wrenches at lists.re-wrenches.org
> >
> > Change listserver email address & settings:
> > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
> >
> > There are two list archives for searching. When one doesn't work, try
> > the other:
> > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
> > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
> >
> > List rules & etiquette:
> > http://www.re-wrenches.org/etiquette.htm
> >
> > Check out or update participant bios:
> > http://www.members.re-wrenches.org
> >
> >
> >
> > ------------------------------
> >
> > End of RE-wrenches Digest, Vol 18, Issue 392
> > ********************************************
> _______________________________________________
> List sponsored by Redwood Alliance
>
> Pay optional member dues here: http://re-wrenches.org
>
> List Address: RE-wrenches at lists.re-wrenches.org
>
> Change listserver email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
> There are two list archives for searching. When one doesn't work, try the
> other:
> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/
> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
>
> List rules & etiquette:
> http://www.re-wrenches.org/etiquette.htm
>
> Check out or update participant bios:
> http://www.members.re-wrenches.org
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20251006/05eea548/attachment.htm>