I am using solar and don't notice any difference in the sound when its running on the solar or on the grid.
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I once looked into getting solar panels for my roof, but did not have enough roof space with unimpeded sunlight to make it worthwhile. If you want to listen at night, though, you will need to get a battery which is charged by solar power, which can add significantly to the cost--otherwise you'd be on the grid at night. Not sure how much the current batteries can provide in the way of power, you'll need to look into that.
A "regular" solar panel installation does not get you "off grid", your power circuit, of where the solar system is now a part, is still connected to the grid.
The power your panels produce just cause your meter to run slower maybe even reverse in case your own consumption is less than the solar panel power output.
Sidssp, on a serious note, I wonder if there are benefits. When you think what we spend on power conditioners to filter out the bad stuff imposed on the lines to our homes. You would have a pure sine wave without any "noise" imposed as long as you can disconnect from the inbound power company supply line. If you use a power conditioner, I would try bypassing it for a time and at night when you are back online, listen if you can hear a degradation.
I would be curious to hear your results.
The waveform of the power output of a solar panel inverter could hardly be any more noisy.
Some are just 60hz square waves, some are "three step" and even the best have major power output at multiples of 60hz, up to and beyond 2,000hz. Waveform quality is just not a priority.
If your equipment is sensitive at all to noise in the power mains, a regenerating power conditioner could be required.
At the same time, the inverters broadcast all sorts of RFI.
This guy wrote it up pretty well :