Backup mode with the KOSTAL BackUp Switch

The KOSTAL BackUp Switch is a manual switch manufactured by KOSTAL. The procedures described here relate specifically to this model.

If a different backup box has been installed, please refer to the manufacturer’s instructions for details on how to operate it.

The backup function must be activated during initial commissioning or by changing the operating mode on the inverter. Depending on the hardware installed, you can choose between the manual KOSTAL BackUp Switch or an automatic backup box. This setting can only be carried out by an installer.

Procedure in the event of a mains power failure with the KOSTAL Backup Switch

  1. As soon as the mains supply fails, you will receive an event message on the inverter.
  2. Message on the inverter display:
    The public grid has failed. Please switch to backup mode.
  3. The red fault LED on the inverter lights up.
  4. The following event messages are displayed in the status bar:
    - 6021 (The mains supply has failed. The inverter is ready to start backup mode.)
  1. Switch to backup mode (Home) on the KOSTAL Backup Switch.
  3. The inverter is establishing a backup power supply. It takes a maximum of 5 seconds for backup mode to start.
  4. The red and green LEDs on the inverter are lit.
  5. The following event message is displayed in the status bar:
    Backup mode.
  1. Backup mode active.

What are the required steps if the inverter shuts down when there is an overload?

If there is an overload, the inverter tries to establish a backup power network three times before it shuts down.

The inverter display then shows a message that the load should be reduced.

  1. Shut down consumers in the house grid to reduce the load.
  2. Acknowledge the message on the display.
  3. The inverter now tries to establish a backup power network again.

If it is still not possible to establish a backup power network, reduce the consumers further.

Procedure when grid power is restored using the KOSTAL BackUp Switch

The energy meter measures the grid parameters at the grid connection point for the public grid. As soon as the grid is available again, the energy meter transmits this information to the inverter.

  1. As soon as the public grid is available again, you will see an event message on the inverter display.
  2. The red LED on the inverter goes out.
  3. After approx. 60 seconds, the following message appears on the inverter display:
    The public grid is available again. Please switch to grid operation.
  4. Switch the KOSTAL Backup Switch to grid operation (power pole).
  6. All loads are immediately reconnected to the public grid and can be used again.
  7. Depending on the grid regulations, the inverter will switch back on after approx. 90 seconds and can once again feed electricity into the public grid.
  8. The green LED on the inverter is lit.
  1. Grid operation is active again.