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ErrorLib — Industrial Fault Code Library

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3301/3303

Unstable operation (Insufficient DC Power)

SMA · Sunny Boy Solar Inverter

What does 3301/3303 mean?

There is not enough power at the DC input of the inverter to enable stable operation, consequently preventing the inverter from connecting to the utility grid. This can be due to environmental factors or system design.

Common Causes

  • PV array is incorrectly designed for the inverter's requirements.
  • PV array is covered by snow or is otherwise shaded.
  • Errors within the PV array reducing power output.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure that the PV array is correctly designed.

  2. 2

    Ensure that the PV array is not covered by snow or otherwise shaded.

  3. 3

    Ensure that the PV array is free of errors (e.g., damaged modules or connections).

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

Related Faults

101Grid fault10252[Interface]: communication disrupted10253[Interface]: connection speed goes to [100 Mbit / 10 Mbit]
Source: SMA Sunny Boy Solar Inverter
Open Manual (Page 51)Search more codes in this manual