[RE-wrenches] Sunny Boy swapping

Sat Nov 15 09:27:16 PST 2025

https://millersolar.com/MillerSolar/case_studies/SMA_40_Series/Whats_wrong_with_40_Series.html

One advantage to the 40 series:  the 22 series does not taper charge with
FSPC. Production is either off or on.

William Miller
Miller Solar.com
805-438-5600
www.millersolar.com

On Sat, Nov 15, 2025 at 9:18 AM Bill P. Battagin via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Hey wrenchers,
>
>          Anybody see an issue with swapping out a failed SB6000TL-us-22
> with a SB6.0-1SP-US-40 or 41.  The string voltages and amps work for both
> with this array.
> Thanks, Bill
>
> Feather River Solar Electric
> Bill Battagin, owner
> 4291 Nelson St. (Shipping)5575 Genesee Rd <https://www.google.com/maps/search/5575+Genesee+Rd?entry=gmail&source=g>. (USPS, UPS)
> Taylorsville, CA  95983
> www.frenergy.net
> 530-284-7849, 258-1641(cell)
> CA. C10 Lic # 874049
> Solar Powered since 1982
> Home of the Sunny Side Up
>
>
> ------------------------------
> *From: *"Maverick Brown via RE-wrenches" <
> re-wrenches at lists.re-wrenches.org>
> *To: *"RE-wrenches" <re-wrenches at lists.re-wrenches.org>
> *Cc: *"Maverick Brown" <maverick at mavericksolar.com>
> *Sent: *Thursday, October 16, 2025 5:11:37 PM
> *Subject: *Re: [RE-wrenches] Sol-Ark 15K and HomeGrid - Comm Cable Pinout
>
> As a side note,
> I just swapped a pair of 12k MCU boards. Pretty easy for the 12k and I
> left them hanging on the wall but completely shutdown.
>
> That’s a great time for an AC bypass.
>
> The MCU board has the device ID, aka inverter serial number.
>
> So, when you swap them out, you’ll need to re parallel the group and
> likely with Sol-Ark on the line.
>
> Then, the old “inverter” will show as disconnected and if you don’t need
> its historical data, it can be deleted.
>
> 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 6:25 PM, Jason Szumlanski <
> jason at floridasolardesigngroup.com> wrote:
>
> 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 <
> re-wrenches at lists.re-wrenches.org> 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 *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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