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Multiplus II 48v 3000 buzzing relay and high idle consumtion

When grid connected, relay is quiet. When disconnecting grid, relay start buzzing. Or sometimes the relay is quiet and when I gently knock on the casing, relay start buzzing. Any thoughts?

The seller I have buy it from does not answer me. Is the relay possible to replace by my self?

And the unit draws over 40 watts in idle current when inverting.

I live in Sweden, any chance that I can claim warranty any other way? The unit is 3 weeks old.

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