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Derating (Overtemperature)

Derating — Inverter reduces output due to overheating

SMA · Sunny Boy Inverters

What does Derating (Overtemperature) mean?

The inverter is reducing its power output to prevent internal components from overheating. This is a safety measure to maintain safe operating temperatures.

Common Causes

  • Overtemperature within the inverter.
  • Blocked fan intakes preventing proper airflow.
  • Poor inverter installation location with inadequate ventilation.
  • Incorrect configuration or string sizing leading to excessive heat.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the heat dissipation by ensuring fan intakes are clear and not blocked by debris. Clean if necessary.

  2. 2

    Review the inverter's installation location for better ventilation and adequate airflow.

  3. 3

    Contact your installer to check the configuration and string size to prevent unnecessary yield losses.

  4. 4

    If the issue persists after checking ventilation, contact your installer or SMA for further investigation.

Browse all codes in this manual (70)
Verified technical data. Last updated: April 2026

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Source: SMA Sunny Boy Inverters
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