307

DC low (PV input voltage too low)

Fronius · Solar Energy

What does 307 mean?

The DC input voltage from the PV system is too low for feeding energy into the grid. This causes a short-term interruption as the inverter repeats its start-up routine. This is often displayed routinely early morning or evening due to low insolation and may not indicate a fault.

Common Causes

  • Insufficient solar insolation (e.g., early morning, evening, cloudy weather)
  • Faulty PV modules or connections resulting in low voltage

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Observe the solar insolation levels and wait for sufficient sunlight

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

Related Faults