Solar panel buzzing

[Boringfrog]

As per title, although I cannot hear it much thanks to my tinnitus, SHMBO mentioned it again this morning. So do solar panels buzz? It's Sikaflexed on the roof with aluminium brackets.

 

[The Coops]

What is there to buzz? If its when traveling it could be the wind resistance blowing through and resonating if is while stood still have a look for insects under it, the panel is nothing more than light sensitive diodes that convert sunlight into electricity via an inverter, it could be the inverter that is buzzing.

 

[Richard n Ann]

Could be the high frequency the PWM regulator works at. Like when you squeeze the trigger on a battery drill you can hear the speed controller frequency

 

[Off da Grid]

Have you checked for wasps or bees?

 

[autorouter]

Have you checked for wasps or bees?

It's August, so more likely to be KILLER HORNETS!!!

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[Raul]

Could be the high frequency the PWM regulator works at. Like when you squeeze the trigger on a battery drill you can hear the speed controller frequency

The frequency is in MH territory, not detectable by any human ear.
Most likely a loose/ high resistance connection or weak point.