The answer to 'EV charger buzzing noise' is that a buzzing or humming sound from an EV charger is usually caused by electrical interference or a faulty component. This can be due to issues with the electrical wiring, grounding, or the charger itself.
Some common causes include loose connections, a malfunctioning transformer, or interference from nearby electrical devices. The buzzing noise may also be a sign of an overloaded circuit or a problem with the charger's internal electronics. If the noise is accompanied by flickering lights or other electrical issues, it's best to have a licensed electrician inspect the system.