6502-6514 on a SMA Solar Technology AG Sunny Island 4.4M / 6.0H / 8.0H: Temperature of transformer or heat sink too high (overload or ambient temperature)
Short answer
On a SMA Solar Technology AG inverter, 6502-6514 means: Temperature of transformer or heat sink too high (overload or ambient temperature). The manual does not say whether the inverter stops. An engineer is needed to fix the cause.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: Temperature of transformer or heat sink too high (overload or ambient temperature).
Part involved: Sunny Island battery inverter.
When it shows: Temperature of transformer or heat sink too high (overload or ambient temperature).
Likely causes:
- Disconnect AC sources and loads and restart; reduce loads; clean the fans.
Is it safe?
| Does the inverter stop? | Not stated |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
| Engineer needed? | Yes |
The manual does not say whether the inverter stops.
Resetting itself: yes.
Manual reset: Autostart after malfunction (limited number of attempts, then 10-minute wait) per SMA 14.1; some errors must be acknowledged via the user interface.
What you can check
- Read the event in the Sunny Island web interface / Sunny Portal and note it for your installer.
- Check the Sunny Island is not boxed in and air can reach it; reduce the load.
What the engineer will check
- Check load profile vs Sunny Island rating, battery bank voltage/charge, temperature sensor wiring, fans; parameter changes via installer login.
Who to ask for: Battery / off-grid installer (SMA Sunny Island trained).
Certification: Qualified electrician competent in battery energy storage (IET Code of Practice for Electrical Energy Storage Systems); manufacturer-trained installer.
What you might notice
Sources
- Operating manual SUNNY ISLAND 4.4M/6.0H/8.0H ↗ · SI44M-80H-13-BE-en-15 Version 1.5 · page 149 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026