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
Observe the solar insolation levels and wait for sufficient sunlight
Verified technical data. Last updated: March 2026
Related Faults
Source: Fronius Solar Energy