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Green LED flashing (1.5s on, 0.5s off)

Green LED flashing (1.5 s on and 0.5 s off) — Secure power supply operation active

SMA · SUNNY BOY Solar Inverters

What does Green LED flashing (1.5s on, 0.5s off) mean?

This LED pattern indicates that the inverter is actively providing power to the secure power supply outlet. This operation is enabled, and the inverter is supplying current from the PV system.

Common Causes

  • Secure power supply operation is enabled and active.
  • A load is connected to the secure power supply outlet and is drawing power.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Confirm that you intended to enable secure power supply operation.

  2. 2

    Check the inverter display for 'SPS-mode active' message and power output.

  3. 3

    Ensure that the connected load does not exceed the inverter's capacity for secure power supply.

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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