Yes there's a distinct whine when charging a Zoe. I think it's an artefact of their somewhat unusual method of charge operation, so they all do it (to my knowledge). It's not very loud, but might not be ideal under an open bedroom window in a quiet location. Also Zoe is very much more sensitive to earthing conditions, I think for the same reasons. We had to have our earth rods upgraded to get reliable charging in dry weather.Regarding the Zoe, do they all make the sometimes reported whining noise when charging? Our cars are parked below our bedroom window, and I've not consider the Zoe previously because I was concerned I might be able to hear it when charging at night. Our current LEAF and C-Zero are silent.