>What you wrote is incorrect, according to the "Geräte- und Maschinenlärmschutzverordnung" (32. BImSchV (Bundesimmissionsschutzverordnung)) you are generally not allowed to use a motorized lawnmower on Sundays, at nighttime and sometimes middays because of the loudness it creates. If you still use one sundays, you commit "Ruhestörung/disturbance of peace" and will have to pay a fine. In some federal states and regions you are also not allowed to use one at midday.