The short answer
Check the battery comm cable and terminals and reconnect the meter comm cable; persistent means Sungrow service.
Plain explanation
From the Sungrow manual for the SH-RT + battery: Installer checks battery comm cable and terminals. Reconnect the meter comm cable. The rest of the checklist is below; work through it in order. Installer only: DC and AC work on a live PV system is dangerous, so owners should note the code and call their installer.
Steps from the source
- Installer checks battery comm cable and terminals
- Reconnect the meter comm cable
- Persists → Sungrow service
Source
Sungrow SH5.0-10RT User Manual Ver21, §10.1 Troubleshooting, §10.1 Troubleshooting, printed p134-138info-support.sungrowpower.com ↗
Where installers ask this
- Sungrow SBR192 issue (r/solar)
- reddit.com/r/DeutschePhotovoltaik/comments/1ujhw4z/
- reddit.com/r/solar/comments/1grmlp1/
- reddit.com/r/amberelectric/comments/1oq78i1/
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.