The short answer
Check the battery fault LED, battery enable/RS485 settings, power and comm cables, then do the manual's restart sequence.
Plain explanation
From the Huawei manual for the SUN2000 + LUNA2000: Look at the battery: if its fault LED is on → supplier. In the app check the battery is enabled and RS485 parameters are right. 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
- Look at the battery: if its fault LED is on → supplier
- In the app check the battery is enabled and RS485 parameters are right
- Installer checks battery power and comm cables, and that the auxiliary power switch is ON
- Restart per manual: send shutdown command, switch AC/DC/battery off, wait 5 min, switch on battery → AC → DC
- If batteries were removed, set Battery type = None
Source
Huawei Inverter Alarm Reference, Issue 09 (2024-11-01), EDOC1100345192, Alarm 2068, §38, p45files.keno-energy.com ↗
Where installers ask this
- Help needed: Huawei Luna2000 S1 (r/solar)
- reddit.com/r/SolarUK/comments/1v9u0fj/
- reddit.com/r/solar/comments/zo7nd7/
- reddit.com/r/DeutschePhotovoltaik/comments/1oruzh5/
- reddit.com/r/SolarDIY/comments/15p5umd/
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.