The answer to 'EV charger making buzzing noise' is that a buzzing or humming sound from an EV charger is often caused by normal electrical operation, but it can also indicate an issue that requires professional attention. Common causes include:
Normal Operation: Some amount of buzzing or humming is normal as the charger converts AC power to DC power for the vehicle. This is due to the electrical components inside the charger vibrating slightly.
Loose Connections: If the buzzing is intermittent or getting louder, it could be a sign of loose electrical connections inside the charger or at the connection point. This requires professional inspection and repair.
Faulty Components: Damaged or malfunctioning internal components like transformers, capacitors, or relays can also cause buzzing or humming. This is an issue that should be diagnosed and repaired by a licensed electrician.