D300S: PV Step Down Module

I was so happy to receive this module, as it finally allowed us to wire our oversized solar array (10 445W bifacial panels) so we have good winter production in a very dark place. However, I would have appreciated if Bluetti included a description of the noise (along with decibel rating) that the unit creates. It's constant buzz is like an electric shaver, and for those with small homes, this would allow for better planning on the installation location.
Thank you!