I had not used DC chargers much until a recent road trip from the Bay Area to rural Colorado, backpacking etc. and back. The last two weeks I have used them a LOT. More often than not, the fan that kicks in when I am pulling 70-ish kW makes a noise that does not sound like a smoothly turning fan. I have recorded some using voice memos, but will need to figure out what formats this bulletin board will support. In short, it sounds like about 60 dB buzzing noise (conversational voice level), maybe around 50 Hz. Sometimes it is a quiet whir, which makes me think there is something wrong with the louder noise. Please tell me what YOUR Niro battery fan sounds like when you are drawing > 50 kW. Thanks!