All Sunny Boy and Sunny Tripower inverters fulfill all the regulations and specifications applying to them and are below permissible thresholds.
Unfortunately the conversion of Direct Current into Alternating Current cannot take place completely silently. Therefore SMA does not recommend installation directly in the living area.
In periods when the inverter does not feed energy into public grid (if the solar irradiation is not sufficient or at night) it switches off, in this state no noise is produced. (sas)