Noise emission in inverters

Information on noise emission can be found on the inverter's datasheet and in the product manual at www.SMA-Solar.com.

In practice, the noise level of an inverter may increase or may be perceived as louder. Possible causes for this are:

• Increase in noise emissions caused by mounting errors

• Subjectively perceived increase of noise emissions

• AC grid quality

Increase in noise development caused by mounting errors

Depending on the selected mounting surface, higher noise emissions may occur. To keep these effects to a minimum, it is necessary to closely observe the information in the installation manual of the inverter. A solid support surface such as a brick or concrete wall should be chosen for installation. Mounting to drywall or particle board will result in louder noises due to the vibration and resonance behavior. In general, inverters should not be installed in a location where their operating noises could disturb people.

Information: Due to the high degree of protection IP65, inverters can also be safely installed outdoors.

Subjectively perceived increase of noise emissions

Regardless of the previously described points, in the installation environment, inverters may be louder or perceived as louder than the datasheet suggests. Possible causes are:

• A higher ambient temperature

• The device arrangement

• The basic noise level of the ambient noises

• The simultaneous operation of multiple devices

• Acoustic reflections

In actual installation environments, inverters may be louder or perceived as louder than indicated in the datasheet. This is due to the acoustics measurement of the SMA inverters being carried out under standard conditions (EN 3744-3-2). However, the above-mentioned influencing factors cannot be taken into account in measurements according to the standard.