The short answer
Check the internet connection and that Webconnect is activated.
Plain explanation
From the SMA manual for the Sunny Boy: Check internet. Check Webconnect activated. Owners can do the app and visual checks; any work on the wiring is for the installer.
Steps from the source
- Check internet
- Check Webconnect activated
Source
SMA Sunny Boy 3.0-5.0 Operating Manual (SB30-50-1AV-40-BE-en-10), §12.2 p77files.sma.de ↗
Where installers ask this
- SMA inverter disconnecting every 7 days (r/solar)
- reddit.com/r/solar/comments/q1vq6v/
- reddit.com/r/solar/comments/ky2lpp/
- reddit.com/r/solar/comments/198lujx/
- reddit.com/r/solar/comments/13rg9ny/
General guidance based on the manufacturer's manual or the named source. Always follow the current manual for your exact model and your national code. DC and AC electrical work is for qualified installers only. Not affiliated with or endorsed by any brand named; trademarks belong to their owners.