105 on a SMA Solar Technology AG Sunny Boy: The grid voltage or grid impedance at the connection point of the inverter is too high. The inverter has disconnected from the utility grid
Short answer
On a SMA Solar Technology AG inverter, 105 means: The grid voltage or grid impedance at the connection point of the inverter is too high. The inverter has disconnected from the utility grid. The inverter stops until the fault clears or is reset. An engineer is needed to fix the cause.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: The grid voltage or grid impedance at the connection point of the inverter is too high. The inverter has disconnected from the utility grid.
Part involved: grid voltage monitoring.
When it shows: The grid voltage or grid impedance at the connection point of the inverter is too high. The inverter has disconnected from the utility grid.
Likely causes:
- SMA corrective measures: Check whether the grid voltage at the connection point of the inverter is permanently in the permissible range. If the grid voltage is outside the permissible range due to local grid conditions, contact the grid operator. The grid operator must agree with an adjustment of the voltage at the feed-in point or with a change of the monitored operating limits. If the grid voltage is permanently within the permissible range and this message is still displayed, contact the Service.
Is it safe?
| Does the inverter stop? | Yes |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
| Engineer needed? | Yes |
The inverter stops until the fault clears or is reset.
Resetting itself: yes.
Manual reset: Automatic when condition clears.
What you can check
- Read the event number and message in the SMA Energy app / Sunny Portal (ennexOS) or the inverter's web interface and note the date/time for your installer. A red LED on the inverter means an event has occurred.
- If it happens once and the inverter resumes feeding in on its own, no action is needed; if the event keeps recurring, contact your installer.
- If neighbours with solar report the same, the local grid voltage may be high - your installer can raise it with the DNO.
What the engineer will check
- Measure grid voltage at the inverter connection point over time; check AC cable sizing/voltage rise; confirm country data set (G98/G99 UK setting); if grid voltage is persistently high contact the DNO - only change monitored limits with DNO agreement and SMA Service.
Who to ask for: PV installer / electrician; DNO liaison.
Certification: Installer liaison with the DNO; any change to grid-protection settings needs DNO agreement (G98/G99) and the manufacturer's installer/grid code.
What you might notice
Sources
- Operating manual SUNNY BOY 3.0/3.6/4.0/5.0/6.0 ↗ · SBxx-1AV-41-BE-en-21 Version 2.1 · page 83 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026