The short answer
Backup load is above the inverter rating: remove big loads, restart, then escalate if it persists.
Plain explanation
From the Deye manual for the SUN-SG04LP1 hybrid: Check backup/load power is within the inverter rating. Remove big loads from the backup output. The rest of the checklist is below; work through it in order. Owners can do the app and visual checks; any work on the wiring is for the installer.
Steps from the source
- Check backup/load power is within the inverter rating
- Remove big loads from the backup output
- Restart the inverter
- Persists → installer / Deye support
Source
Deye SUN-3.6-6K-SG04LP1 Manual V4.0.0, Chart 7-1 Fault information, Chart 7-1 F18 / F34www.deyeinverter.com ↗
Where installers ask this
- Consumption exceeds Deye inverter rating (r/SolarDIY)
- reddit.com/r/SolarDIY/comments/1ikiyfs/
- reddit.com/r/solar/comments/17707ke/
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.