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Fronius · PV inverters · Fronius Symo 3.0–20.0 (three-phase grid inverter, SnapINverter)

STATE 307DC low – DC input voltage too low for feeding energy into the grid

Name in the manufacturer's documentation (service manual): DC low – DC input voltage too low for feeding energy into the grid[1]

In plain words (editorial)

The DC input voltage from the panels is too low to feed energy into the grid. Feeding into the grid is interrupted briefly and the inverter restarts its start-up routine. The manual says to wait for sufficient sunlight; the fault clears automatically.

When to call a service technician: If the code keeps recurring, contact your system installer.

✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.

The Polish page has more detail (plain-language explanation, safe checks, guides): Read in Polish →

Sources

Every statement has a footnote to the document and PDF page. “Quote verified” means the quote was found automatically in the text of that page.

  1. [1] Fronius Symo 3.0-3 – 20.0-3, Fronius Eco 25.0-3 – 27.0-3 – Operating Instructions (42,0410,2028, ed. 016-24082016) – distributor copy (42,0410,2028 (016-24082016)) , p. 46 manufacturer document – copy from a distributor quote verified 307 DC input voltage too low for feeding
  2. [2] Fronius Symo / Fronius Eco – Operating Instructions (e-Manual HTML), Version 044-17072025 – chapter “Status diagnostics and troubleshooting” (text capture) (e-Manual 4204101909, 044-17072025) , p. 3 official manufacturer document quote verified wait for sufficient level of insolation
  3. [3] Fronius Symo / Fronius Eco – Operating Instructions (e-Manual HTML), Version 044-17072025 – chapter “Status diagnostics and troubleshooting” (text capture) (e-Manual 4204101909, 044-17072025) , p. 3 official manufacturer document quote verified Fault is rectified automatically. If this status code keeps recurring, contact your system engineer
  4. [4] Fronius Symo / Fronius Eco – Operating Instructions (e-Manual HTML), Version 044-17072025 – chapter “Status diagnostics and troubleshooting” (text capture) (e-Manual 4204101909, 044-17072025) , p. 3 official manufacturer document quote verified Short-term interruption while feeding energy into the grid The inverter resumes its startup routine.