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ErrorLib — Industrial Fault Code Library

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Derating

Inverter Output Power Reduction Due to High Temperature

SMA · SUNNY BOY 5000US-8000US Solar Inverter

What does Derating mean?

The Sunny Boy SB50US-80US-IUS094030 inverter is reducing its output power because its internal temperature is too high. This protective measure prevents damage to internal components and typically occurs when the ambient temperature exceeds 45°C.

Common Causes

  • High internal temperature of the inverter components.
  • Ambient temperature exceeding 45°C.
  • Blocked fan intakes hindering proper cooling.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Inspect the fan intakes of the Sunny Boy inverter for blockages and clean them thoroughly.

Browse all codes in this manual (23)
Verified technical data. Last updated: April 2026

Related Faults

Bfr-SrrMicro-controller Communication FailureEEPROMEEPROM Non-Essential Data Access FailureEEPROM pDefective Data EEPROM
Source: SMA SUNNY BOY 5000US-8000US Solar Inverter
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