Using battery power to go off the City's power grid

One word; "Super-neutral".

Well ok, it is in fact (two).

Thanks dpop. What you are saying for utility powered AC circuits makes total sense (dedicated lines, balanced power, isolated grounds and neutrals, etc) @ricevs and others have really done the yeoman's work on trying to find a reasonably priced but high-end battery powered solution which is what I'm focused on for now. 

The central and unknown issue is what types of distortions are coming from inverters.  They are substantial, a lot higher than from filtered and grounded power.  Using a Puritan or other filter after the inverter makes sense for a one-two punch.  So we are back to the primitive state of wondering why there may be natural aspects of tube electronics yet with their much higher distortion measurements vs SS.  Back to listening.

@dpop The setup you're speaking of is pretty much exactly replicates my AC setup!

Speaking of neutrals, recently I experimented with two of my diy power cord recipes. One has exact same number and gauge of wire for neutral and hot, the other has oversized neutrals. While I expected the recipe with equal N and H to outperform the oversized neutral coming out of my BPT balanced transformer based PC, result was quite the opposite. PC with equal N and H being more lightweight, bass shy, along with more hifi/analytical qualities.

I don't know how much this has to do with the way neutral is treated in my dedicated lines, but it is there. First discussion I've seen on the importance of neutrals!

@sbayne 

Thank you for that most interesting video.  Crazy hearing your local radio station so clearly on your AC line!