The short answer
Check grid reliability, AC cable tightness, L/N order and the AC breaker.
Plain explanation
From the Sungrow manual for the SH-RT hybrid: Check the grid is reliable / no outage. Installer checks AC cable is firm and L/N correct. 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. Grid limits depend on your country, so check your national code and grid operator rules.
Steps from the source
- Check the grid is reliable / no outage
- Installer checks AC cable is firm and L/N correct
- Check AC switch / breaker is ON
Source
Sungrow SH5.0-10RT User Manual Ver21, §10.1 Troubleshooting, §10.1 Troubleshooting, printed p134-138info-support.sungrowpower.com ↗
Where installers ask this
- DC current leakage to ground detected by the inverter (r/solar)
- reddit.com/r/amberelectric/comments/1sr1ilh/
- reddit.com/r/solar/comments/1nt5mk0/
- reddit.com/r/nzsolar/comments/1og5wtj/
- reddit.com/r/solar/comments/1kiz1wq/
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.