Backup power overload

Backup power overload

Fronius · Symo Advanced

What does Backup power overload mean?

This status code indicates that the inverter has stopped operating in backup power mode due to excessive electrical loads connected to the PV Point. The inverter has a maximum continuous output of 1560 W (120V at 13A) and an overload capacity of 35% for a duration of 5 seconds, depending on the current PV module power.

Common Causes

  • Connected electrical loads at the PV Point (OP) terminal exceed the inverter's continuous power rating of 1560 W.
  • Transient load surges (e.g., from motor startups) exceed the inverter's short-term overload capacity of 35% for more than 5 seconds.
  • Insufficient energy generation from the PV modules to support the connected loads at the PV Point.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Measure the total power consumption of all loads connected to the PV Point (OP) terminal and compare it against the inverter's continuous output rating of 1560 W.

  2. 2

    Disconnect non-essential loads from the PV Point to reduce the overall power demand below 1560 W.

  3. 3

    Evaluate if any loads connected to the PV Point cause high inrush currents (e.g., fridges, freezers) that exceed the 35% overload capacity for longer than 5 seconds. Consider connecting these loads to a different circuit if possible.

  4. 4

    Verify that the PV modules are generating sufficient power to support the connected loads, especially during peak demand.

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Verified technical data. Last updated: March 2026

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