3523 on a SMA Solar Technology AG Sunny Boy Smart Energy: During the cyclic insulation test, it is tested whether the electric strength of the battery and PV system is within the safe range. The inverter will be restarted once during an insulation test
Short answer
On a SMA Solar Technology AG inverter, 3523 means: During the cyclic insulation test, it is tested whether the electric strength of the battery and PV system is within the safe range. The inverter will be restarted once during an insulation test. The inverter keeps running.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: During the cyclic insulation test, it is tested whether the electric strength of the battery and PV system is within the safe range. The inverter will be restarted once during an insulation test.
Part involved: status message.
When it shows: During the cyclic insulation test, it is tested whether the electric strength of the battery and PV system is within the safe range. The inverter will be restarted once during an insulation test.
Is it safe?
| Does the inverter stop? | No |
|---|---|
| Severity | Information only |
| Engineer needed? | No |
The inverter keeps running.
Resetting itself: yes.
Manual reset: Automatic when condition clears.
What you can check
- Information message only - no action needed.
What the engineer will check
- Informational (commissioning/configuration).
Sources
- Operating manual SUNNY BOY SMART ENERGY 3.6/4.0/5.0/6.0/8.0/9.9 ↗ · SBSExx-50-BE-en-12 Version 1.2 · page 88 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026