Article: The Audio Impact of Solar Panels and Battery Backup: Comparing Sound Quality of Panels, Batteries, and the Grid

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Thank you for the great article. Timely, as I am looking into solar myself. In my case, I've thought about a dedicated audio power circuit that was fed this way: Solar Array > Batteries > Dedicated Audio A/C Circuit

 

Question: 

Doesn't the Tesla PW system just continuously charge on-site batteries? And would that not effectively insulate your power supply from the messy interference on the public A/C grid? I figured it would work like a large-scale power regenerator,...since your A/C is being converted locally from D/C it would be very clean and pure. No?