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 < [email protected]> 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 > > > _______________________________________________ > 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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