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PV series isolation transformers hum

The isolation transformers for the PV series will hum in normal operation. They can hum if the inverter is running or not.

In at least one instance, the inverters were mounted on the roof of the building and this hum was being transmitted into the building, annoying the occupants.

These isolation mounts were used and it solved the issue.
http://209.200.80.33/html/overseas_applications.htm#specs

They put 4 BRA-Greens underneath each transformer.

Previously, they had tried putting a piece of ½? rubber in between the transformer and the rack and it significantly reduced the noise and vibration but was not as effective as the isolators.

See the attached installation photo.
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