Multi II Rapid Clicking Sound Normal?

Hi, I’m testing a used Multiplus II 48/8000 for purchase and noticed this sound when the mains (supplied by another, off-grid inverter) returns. Is it normal?

That’s normal sound of relays self testing on power up or reboot.

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And testing the connection.
If you had a wiring mix up it won’t connect. Buut you would hear several more (rapid clicking) attempts.