1008 on a Sigenergy SigenStor: PV string sinking current. Official suggestion (summarised): Check module count per string, shading/soiling, orientation
Short answer
On a Sigenergy inverter, 1008 means: PV string sinking current. Official suggestion (summarised): Check module count per string, shading/soiling, orientation. The inverter keeps running with some functions stopped.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: PV string sinking current. Official suggestion (summarised): Check module count per string, shading/soiling, orientation.
Likely causes:
- Inconsistent string configuration (fewer modules), shading, different orientation.
Is it safe?
| Does the inverter stop? | Partly |
|---|---|
| Severity | Warning |
The inverter keeps running with some functions stopped.
Resetting itself: unknown.
Manual reset: n/a.
What you can check
- Read the alarm code, name and ID in the mySigen app.
- Report it via mySigen app Support > Troubleshooting (Sigenergy's stated route) or contact your installer.
- Note any new shading on the panels.
What the engineer will check
- Match string lengths/orientations per MPPT.
- Clean/relieve shading.
- Sub-IDs: ID1-ID16 string n sinking current; ID17-ID40 string n backfeed.
Who to ask for: battery storage / PV inverter.
Certification: Sigenergy-trained installer; MCS PV/battery installer for certified installs; electrical work to BS 7671.
What you might notice
Sources
- Sigenergy Alarm List (Version 05) ↗ · 05 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026