[RE-wrenches] Sol-Ark 15K and HomeGrid - Comm Cable Pinout

[Maverick Brown]

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 
maverick at mavericksolar.com
512-460-9825

> On Oct 16, 2025, at 9:27 AM, Jason Szumlanski via RE-wrenches <re-wrenches at lists.re-wrenches.org> 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 
> 
> 
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