Why is there noise from the electric car charger?

[VonEmerson]

The reasons for noise from an electric car charger: 1. The battery charger has a fan for heat dissipation. Over time, dust may accumulate on the fan or the fan's roller oil may decrease, leading to loud noise. Adding lubricating oil to the fan roller can solve this issue. 2. The high-frequency magnetic core inside the charger may become loose. It can be tightened with a piece of paper and then sealed with paraffin or hot melt adhesive. 3. The failure of the front-stage filter capacitor may increase ripple, usually accompanied by a decrease in charging current. The charger of an electric vehicle also generates heat. To prevent overheating and damage, a fan is often installed inside for heat dissipation. Similar to a computer radiator, the sound is initially minimal due to sufficient lubrication, making it hardly noticeable. However, as usage time increases, dust accumulates inside, and the fan's lubrication effect diminishes, naturally causing the noise to become louder.

[AlexandraRose]

The first time I charged my electric car, I heard a buzzing sound from the charger and panicked, thinking it was broken. Later, a friend told me it was actually the cooling fan running to protect internal components from overheating. Electric car charging generates heat, so the fan activates to cool things down, especially during fast charging or in hot summer weather. I've noticed the sound is quite noticeable in the quiet environment of my garage, but it's a normal physical phenomenon and nothing to worry about. However, if the noise suddenly becomes louder, sounds like rattling, or there's a burning smell, there might be an issue—like a stuck fan or aging wiring. I make it a habit to regularly inspect the charger's exterior, ensuring no dust buildup and good ventilation. Also, different brands of chargers vary in noise levels; my neighbor's newer model with a silent design is much quieter, and upgrading to higher-quality accessories can help too. In short, a slight buzzing is no cause for alarm—it's just a sign of normal operation.

[DeDakota]

As someone who drives electric vehicles year-round, I often encounter sounds from the charger, mostly from the cooling fan in operation. During charging, the high current causes electronic components to heat up, prompting the fan to automatically start for cooling. Sometimes, it's the clicking sound of relay switching, which is a mechanical operation during power connection and disconnection. In other cases, poor contact in the charging cable can cause unstable current and noise, requiring re-plugging for inspection. The loudness varies from person to person; I've measured it with a decibel meter, and it's generally considered normal between 40-60 decibels. However, if the sound is persistently loud or intermittently screeching, it might indicate internal component failure, such as a worn-out fan motor. I recommend placing it in a well-ventilated area for charging and avoiding blocking the vents with clutter. I clean the charging port every few months, and less dust means less noise. Always pay attention to abnormal changes and have it checked by a professional shop in time to prevent major issues.

[MacIvan]

The sound from an electric vehicle charger is usually caused by the electromagnetic effects of internal electronic components during operation, such as the humming noise generated by fan or transformer vibrations. During charging, energy conversion generates heat, and the system automatically activates cooling devices to lower the temperature. This is common in most home chargers and is not a major malfunction. If there is a high-pitched squeaking or friction noise, it may indicate aging components. Keeping the charging environment dry and well-ventilated can reduce unusual noises. Minor sounds are normal and can be ignored.