The short answer
High-voltage protection: set inverter charge voltage to 52.5–53.2 V, check comms and ADD switch, rest 15 min.
Plain explanation
From the Pylontech manual for the US5000: Set inverter charge V to 52.5–53.2 V. Check comm and ADD switch. 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
- Set inverter charge V to 52.5–53.2 V
- Check comm and ADD switch
- Leave module OFF ~15 min, restart
Source
Pylontech US5000/US5000-B Installation Manual V1.0 (2024-09), Troubleshooting, Troubleshooting, printed p27-29pylonwebs3.s3.amazonaws.com ↗
Where installers ask this
- Can't connect US3000C battery to ME3000SP inverter (r/SolarDIY)
- reddit.com/r/SolarDIY/comments/x5xhsc/
- reddit.com/r/SolarUK/comments/1k51sqd/
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.