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Green LED flashing (2s on, 2s off)

Green LED flashing (two seconds on and two seconds off) — Waiting for feed-in conditions

SMA · SUNNY BOY Solar Inverters

What does Green LED flashing (2s on, 2s off) mean?

The inverter is ready but the conditions required for feeding power into the grid are not yet met. Once conditions are favorable, the inverter will automatically start feeding power.

Common Causes

  • Grid conditions not yet suitable for power feed-in (e.g., insufficient solar irradiation, grid voltage outside limits).

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Wait for suitable feed-in conditions. The inverter will start automatically when ready.

  2. 2

    Ensure the PV system is receiving adequate sunlight.

  3. 3

    Check the inverter's display for any additional messages related to grid conditions.

Browse all codes in this manual (31)
Verified technical data. Last updated: April 2026

Related Faults

1501Event 1501 — Reconnection fault, grid data mismatch301Event 301 — Grid fault, voltage out of range3301, 3303Event 3301 or 3303 — Unstable operation, insufficient DC power
Source: SMA SUNNY BOY Solar Inverters
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