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

Thu Jun 25 15:53:16 PDT 2026

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
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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
[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<mailto: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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