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306

Fronius Symo Hybrid Inverter Code 306 — Not enough PV power or no power requested from battery

Fronius · Solar Inverters

What does 306 mean?

There is insufficient PV power available for feeding energy into the grid, and no power has been requested from the battery. This can be a normal occurrence during low light conditions (early morning/evening).

Common Causes

  • Low solar insolation (e.g., dawn, dusk, cloudy weather)
  • No active energy management command to draw from battery
  • PV module issue (less common if sporadic)

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Wait for sufficient solar insolation to increase.

  2. 2

    Check if an energy management command is required or pending to use battery power.

  3. 3

    If this status code keeps recurring during periods of adequate sunlight, contact your system fitter.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

1Error 1 (Binary 0001) — Hardware fault10Error 10 (Binary 1010) — General fieldbus error102Fronius Symo Hybrid Inverter Code 102 — AC voltage too high
Source: Fronius Solar Inverters
Open Manual (Page 124)Search more codes in this manual