sungrow inverters. a little noisy. 

this is a 15kW three phase inverter. It's like three inverters in to one box. Always going to be a hum of operation, nothing compared to fan cooled inverters. We sell these in Queensland. Here we have to install a box protecting those DC inputs and the earth. Shame it had to go in a break room... wouldn't notice it in a less used area....

I guess it is normal when it is working close to medium or maximum power. Would be much worse if the cooling was by fan method. I'm thinking to install a 1ph modelo of 3.68 KW. Hybrid model SH3.6RS.

My 3kw fronius primo is just as noisy. Lucky it's outside in the garage but the moment I open the door I can hear it super loud.

Using the shg10rt.. have no noise in use, but its noisy in stand by.