High Pitch Noise while Charging?

[LSUjeep]

When charging this evening with the 110v charger I noticed a really high pitched faint noise emitting from the vehicle. We've only owned it for about 3 weeks but it's the first time I've noticed this noise. Any idea what it could be? Is it normal? Thanks

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[PatriotX]

There are several different pump and fan noises depending on heating or cooling needs of the battery.

If it is sounds like a small jet engine, it’s part of the battery thermal management and normal.

Enjoy your 4xe!

 

[LSUjeep]

It has gotten much warmer here lately but it's more of an electrical very high pitch noise. Almost hard to hear at first.

 

[redracer]

The faint high pitch wine is the sound of the power converters doing their job. There is a lot going on while charging. The converters are rectifying 120V 60hz AC to 120V DC, then stepping up the 120V DC to anywhere from ~350V DC to ~450V DC for the HV battery, and also stepping down to ~13.5V DC for the LV battery. Add in the cooling fans and even the air conditioner will spin up when needed to keep the HV battery within a temperature range, and there is a lot of noises that can happen.

Mainly the high pitch wine is from the voltage step up process (buck/boost flyback circuit) which basically is a high frequency solid state switch cycling a inductor and capacitor network, which causes a good audible high pitch hum.

In short... Completely normal.

 

[LSUjeep]

The faint high pitch wine is the sound of the power converters doing their job. There is a lot going on while charging. The converters are rectifying 120V 60hz AC to 120V DC, then stepping up the 120V DC to anywhere from ~350V DC to ~450V DC for the HV battery, and also stepping down to ~13.5V DC for the LV battery. Add in the cooling fans and even the air conditioner will spin up when needed to keep the HV battery within a temperature range, and there is a noises that can happen.

Mainly the high pitch wine is from the voltage step up process (buck/boost flyback circuit) which basically is a high frequency solid state switch cycling a inductor and capacitor network, which causes a good audible noise.

In short... Completely normal.

Ok cool - I appreciate the response. Just wanted to make sure. thanks

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