1006 on a Sigenergy SigenStor: PV string overvoltage. Official suggestion (summarised): Measure string voltage; reduce modules per string per spec
Short answer
On a Sigenergy inverter, 1006 means: PV string overvoltage. Official suggestion (summarised): Measure string voltage; reduce modules per string per spec. The inverter keeps running with some functions stopped. An engineer is needed to fix the cause.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: PV string overvoltage. Official suggestion (summarised): Measure string voltage; reduce modules per string per spec.
Likely causes:
- Too many modules in series; open-circuit voltage above maximum input.
Is it safe?
| Does the inverter stop? | Partly |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
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.
What the engineer will check
- Measure Voc per string (cold-weather Voc).
- Redesign string length.
- Sub-IDs: ID1-ID16 string 1-16 input overvoltage; ID17-ID40 MPPT1-24 input overvoltage.
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