Backup Power Overload

What does Backup power overload mean?

This status code indicates that the Fronius Primo GEN24 inverter has stopped backup power mode due to excessive loads connected to the PV Point (OP) terminal. The total power demand from connected appliances has exceeded the inverter's maximum continuous output, which is specified as 1560 W at 120V (13 A AC continuous current). Transient overloads up to 35% are tolerated for a maximum duration of 5 seconds.

• Total power demand from connected loads exceeds the Fronius Primo GEN24 inverter's maximum continuous output of 1560 W (at 120V) in backup power mode.
• High start-up currents from appliances like refrigerators or freezers momentarily exceed the inverter's 35% overload capacity (tolerated for up to 5 seconds).
• Simultaneous activation of multiple high-power loads connected to the PV Point (OP) terminal.
• Insufficient available energy from the PV modules to meet the load demand during backup power operation.

Click steps to track your progress.

1. 1

   Identify and disconnect non-essential loads connected to the PV Point (OP) terminal to reduce the total power demand below 1560 W (at 120V).

2. 2

   Stagger the activation of high start-up current appliances (e.g., motors, compressors) to prevent simultaneous demand peaks exceeding the inverter's transient overload capacity.

3. 3

   Verify that the sum of continuous power ratings for all connected loads does not exceed the Fronius Primo GEN24 inverter's specified maximum continuous output for backup power mode (e.g., 1.56 kW).

4. 4

   Inspect the Fronius Primo GEN24 inverter's LED status indicator to confirm the "Backup power overload" code is displayed, and clear the fault once loads are reduced.

5. 5

   Check the available power from the PV modules and ensure sufficient energy is being supplied to support the connected loads during backup power operation.