[RE-wrenches] SMA 6304 Error Code on 5000TL-US-22

Fri Jun 26 02:52:17 PDT 2026

Harry,

I don't think you can call into SMA at all anymore without setting up a
case online first and providing a case number to the phone robot. It's
really annoying. That's not good customer service. That's unnecessary hoops
for installers to jump through. I really wish SMA would rethink this
process.

With that said, after the hassle they put you through just to talk to a
human, the tech support I have received recently has been competent, and
warranty diagnostics are not particularly onerous.

On the issue, that is almost definitely an internal intermittent component
fault associated with heat. SMA tech support isn't likely to provide
actionable out-of-warranty support for that in the field. A
replacement board or repair probably won't be worth the effort. You're
likely looking at replacement. Ask tech support if they have an
out-of-warranty replacement discount option in this case. You might be able
to get a refurbished or updated unit at a discount if you return the faulty
unit.

I have been telling clients for many years to *expect* inverter replacement
just outside of the warranty period. I want my clients budgeting for this
scenario. It has really cut down on the awkwardness and friction in these
repair-or-replace scenarios.

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, Jun 25, 2026 at 6:56 PM Harry Mahon via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Matt - Echoing Sam’s comments – have you created a case for this system on
> the Online Service Center(OSC)  - https://my.sma-service.com/  ?
>
>
>
> This is now the best way to track and resolve SMA Service cases. (If you
> need to call in, it is best to have a case number when you call – you can
> create a case at any time on the OSC, so do this prior to site visit if you
> suspect you will need to call from site)
>
>
>
> If you do not have an OSC account, you will be asked to create an SMA ID
> first (a single login that is used now to log into Sunny Design, Sunny
> Portal and the OSC).
>
> ENSURE that if you are migrating an old Sunny Design/Sunny Portal login to
> an SMA ID or creating an SMA ID fresh, that you select a COMPANY account
> not a PERSONAL account.  This will flag for Service if you are an
> installer/O&M person vs system owner.
>
> If you have an OSC account, but have not migrated the login to an SMA ID
> yet, you will have already designated your OSC account as personal or
> company, so the account type will carry over to your SMA ID when you
> migrate your old login to an SMA ID.
>
> The first company user to create an SMA ID will be an admin for all SMA
> ID’s for your company – you can send invites from the SMA ID dashboard for
> other employees to create SMA IDs. Creating SMA IDs this way will link all
> these accounts on the OSC – all company service tickets will be visible on
> the OSC dashboard. This OSC knowledge article has more info on the Company
> SMA ID process:
>
> SMA ID Registration of Company Account
> <https://my.sma-service.com/s/article/SMA-ID-Registration-of-Company-Account?language=en_US>
>
>
>
> Is this specific inverter equipped with a comms module/registered to Sunny
> Portal? Definitely that can help with troubleshooting. The SWDM-US-10
> accessory module that allows the SB TL-US-10 line to connect to home router
> (via Ethernet only, no WiFi option) is available through distribution if
> retrofit is desired (this was brought back as it has been very popular for
> homeowners with old SunPower branded SB TL-US-10s trying to re-establish
> monitoring outside of SunPower.
>
>
>
> Best regards –
>
> Mike
>
>
>
>
>
>
> *Michael Mahon* (he/him)
> Manager of Solar Academy |  SMA America
>
> +1 916 918 9412
> SMA America <https://www.sma-america.com/> | Solar Academy
> <https://solaracademy.sma.de/en/> | TechTip Channel
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> | Upcoming Academy Trainings
> <https://solaracademy.sma.de/en/courses.html?filter%5b1%5d=English&filter%5b2%5d=United%20States>
>
>
> <https://www.sma-america.com/products/hybrid-inverters/sunny-boy-smart-energy#c82576>
>
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>
>
> *From:* RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> *On
> Behalf Of *Sam Haraldson via RE-wrenches
> *Sent:* Thursday, June 25, 2026 7:24 AM
> *To:* RE-wrenches <re-wrenches at lists.re-wrenches.org>
> *Cc:* Sam Haraldson <sam at onsiteenergyinc.com>
> *Subject:* Re: [RE-wrenches] SMA 6304 Error Code on 5000TL-US-22
>
>
>
> Matt,
>
> How diligent have you been with SMA tech support?  I know they have three
> levels of support and can elevate cases to an engineering team at their HQ
> beyond that.  If you haven't yet, formally file a support ticket and then
> call the service line.  Prepare to tell the same story you've probably
> already told to the level I technician and if they run out of answers ask
> to be elevated to level II.  From there, continue asking questions. They
> should then inform you that they will take the issue offline to their
> behind-the-scenes team and work with you via email through their support
> ticket system.  SMA has really stepped up its installer support process
> recently and it provides qualified installers a far easier and fluid
> process.
>
>
>
> Cheers,
>
> Sam
>
> [image: OnSite Energy] <https://onsiteenergyinc.com/>
>
> *Sam Haraldson*
>
> Operations Specialist
>
>
>
>
>
> On Wed, Jun 24, 2026 at 5:45 PM Matt Sherald via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
> Hello!
>
>
>
> I'm hoping someone on the list has experience with the 6304 code on the SB
> 5000TL-US-22 or similar vintage (2015) SMA inverter.
>
>
>
> I was asked to troubleshoot an inverter that has developed a daily habit
> of throwing this error and stopping production.
>
>
>
> The production curves over the last several days show production in the AM
> that builds  and then abruptly stops late AM./mid-day.  It looks like a
> problem caused by AC voltage rise, but my multimeter readings at both the
> main breaker and on the circuit board of the inverter stayed below 258V
> even at peak production.
>
>
>
> My impression from the online SMA documentation is that this is a metering
> error internal to the inverter and is not fixable.  SMA does not seem to
> want to deal with this legacy model through tech support channels.
>
>
>
> It might be time for a new inverter, but I wanted to canvas the folks on
> the list before I gave up on this older model.
>
>
>
> --
>
> Matt Sherald
>
> PIMBY Energy, LLC
>
> 304-704-5943
>
>
>
>
>
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