The short answer
Supply 48–53.5 V and charge gently (≤0.05C at or below 45 V); if it doesn't recover, it goes to repair.
Plain explanation
From the Pylontech manual for the US5000: Installer supplies 48–53.5 V. ≤45 V: charge at ≤0.05C. 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 supplies 48–53.5 V
- ≤45 V: charge at ≤0.05C
- Above 45 V: ≤0.5C
- Doesn't recover → repair via distributor
Source
Pylontech US5000/US5000-B Installation Manual V1.0 (2024-09), Troubleshooting, Troubleshooting, printed p27-29pylonwebs3.s3.amazonaws.com ↗
Where installers ask this
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.