1501 on a SMA Solar Technology AG Sunny Boy: The changed country standard or the value of a parameter you have set does not correspond to the local requirements. The inverter cannot connect to the utility grid
Short answer
On a SMA Solar Technology AG inverter, 1501 means: The changed country standard or the value of a parameter you have set does not correspond to the local requirements. The inverter cannot connect to 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 changed country standard or the value of a parameter you have set does not correspond to the local requirements. The inverter cannot connect to the utility grid.
Part involved: AC wiring / country data set.
When it shows: The changed country standard or the value of a parameter you have set does not correspond to the local requirements. The inverter cannot connect to the utility grid.
Likely causes:
- SMA corrective measures: Ensure that the country data set has been configured correctly. To do this, select the parameter Set country standard and check the value.
Is it safe?
| Does the inverter stop? | Yes |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The inverter stops until the fault clears or is reset.
Resetting itself: no.
Manual reset: See engineer checks.
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.
- This points to an installation/configuration issue - contact your installer; do not attempt wiring checks.
What the engineer will check
- Check PE/earth, L/N polarity and neutral connection at the inverter and feed-in meter; check country data set (Grid Guard code needed to change); restart self-test where applicable.
Who to ask for: Electrician / PV installer.
Certification: Qualified electrician (BS 7671; MCS-certified PV installer for work on the PV array/DC side).
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 91 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026