Thanks Maverick. This turned out to be the answer. No ground wire was needed.
I found out the master inverter is faulty. I connected the cable to the slave (after unparalleling) and it worked. Sol-Ark was surprisingly very willing to send me a new MCU board without any argument. 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 Thu, Oct 16, 2025, 1:00 PM Maverick Brown via RE-wrenches < [email protected]> wrote: > Jason, > > I have a couple working HomeGrid to Sol-Ark installs. > > The manual does seem to mix flavors of cable and even the cable that came > with the HomeGrid install of 2024 has Ethernet Type A color code pin out. > > If you keep the pin out as type A, that is fine, but I made a chart with > Type B wiring, attached. Also, I think you should not connect the other > unnecessary wires on the Sol-Ark side, just to eliminate any issues. > > I also assume they are using CAN and not using RS485... > > > Let me know how that works for you. > > Thank you, > > Maverick > > Maverick Brown > Off-Grid Solar Commander since 2006 > *Maverick Solar Enterprises, Inc.* > * • Solar Commander Remote Power* > > * • SunFlow Systems Cathodic Protection *[email protected] > 512-460-9825 > > On Oct 16, 2025, at 9:27 AM, Jason Szumlanski via RE-wrenches < > [email protected]> wrote: > > Does anyone know for sure what the correct pinout is on the communication > cables for this pairing? Sol-Ark has multiple battery integration guide > versions. > > Some show two wires connected to pins four and five on the inverter and > seven and eight on the battery, respectively. In another version of the > guide, four is connected to eight and five is connected to seven. In yet > another version, a green wire is introduced. I have tried all three > combinations, and none work. > > I can't get a straight answer out of either manufacturer, and of course > they're both pointing fingers at each other regarding my battery > communication issue. > > Sol-Ark is sending a firmware update and recommended a factory reset. > That's the next step, but it doesn't answer the question about the correct > pinout. > > > > Jason Szumlanski > Florida Solar Design Group > > > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: [email protected] > > 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/[email protected]/ > 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 > > > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: [email protected] > > 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/[email protected]/ > 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 > >
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