The short answer
Usually CT direction, wrong phase, or a loose CT cable to the meter. Compare live values with the utility meter.
Plain explanation
From the Huawei manual for the Smart Power Sensor / meter: Compare FusionSolar live values with the utility meter. Installer checks the CT is in the right direction. 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
- Compare FusionSolar live values with the utility meter
- Installer checks the CT is in the right direction
- Installer checks each CT sits on the correct phase
- Installer checks the CT cable to the meter is connected
Source
Huawei Inverter Alarm Reference, Issue 09 (2024-11-01), EDOC1100345192, Alarm 2092, §54, p67files.keno-energy.com ↗
Where installers ask this
- Frage zu Smartmeter DTSU666-HW (r/DeutschePhotovoltaik)
- reddit.com/r/DeutschePhotovoltaik/comments/1n3xma3/
- reddit.com/r/DeutschePhotovoltaik/comments/1vue4cw/
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.