The short answer
It shuts down within 30 min if inverter communication is lost. Check comms and collect logs for service.
Plain explanation
From the BYD manual for the Battery-Box Premium HVS/HVM: Battery shuts down within 30 min if inverter comm is lost. Check inverter communication (see §2.4). 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
- Battery shuts down within 30 min if inverter comm is lost
- Check inverter communication (see §2.4)
- Collect logs via BCP for service
Source
BYD Battery-Box Premium HVS/HVM Service Guideline & Checklist (BCU2.0) V1.1, 2025-08-08, §2.6, p7www.bydbatterybox.com ↗
Where installers ask this
- Fronius Gen24 + BYD: battery no longer charging? (r/fronius)
- reddit.com/r/DeutschePhotovoltaik/comments/1vjn81v/
- reddit.com/r/fronius/comments/1i11q4t/
- reddit.com/r/homeautomation/comments/tqpr4i/
- reddit.com/r/fronius/comments/1silqyw/
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.