KEBA External Control / Load Management Integration Issue

KEBA charger does not follow external load management commands (e.g., from PV system or building EMS)

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Incorrect Modbus or API configuration, Communication wiring error, Faulty communication interface board, EMS sending commands in wrong format

How to Fix / Troubleshooting

Safety first: Communication troubleshooting is low-voltage, but opening the charger still requires isolating mains power.

Steps:

  • 1. Verify stand-alone operation: Confirm that the charger works correctly without external control.
  • 2. Check configuration: In the KEBA interface, verify that external control is enabled and that protocol settings (Modbus ID, baud rate, IP, port) match the EMS.
  • 3. Inspect wiring: For wired connections, check RS-485 or Ethernet cabling and terminations.
  • 4. Use diagnostics: If available, use KEBA's diagnostic pages to see whether external commands are being received.
  • 5. Test with simple controller: Temporarily connect a test tool or simple Modbus master to verify that the charger responds to basic commands.
  • 6. Replace interface board: If wiring and configuration are correct but no communication occurs, replace the communication interface board.

Coordinate with the EMS vendor to ensure compatibility with the specific KEBA model and firmware.

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Repair Difficulty

Medium 3/5

Required Part

Communication Interface Board
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