I use a Rowland amp with battery and a Levinson preamp that regenerates the AC. I'm adding an Exact Power any day now plus I also use an input transformer between preamp and CD player. Sound is great as is, we'll see what happens when I put the EP in. I once used a TrippLite UPS with pure sine wave output and after taking it out, felt that the system opened up again. Plus the computer device while hefty buzzed and I'm convinced it put more hash into the line. Try an input transformer, you might be surprised. It kills noise coming from interchassis leakage. I found the bass to improve and the noise floor to drop noticeably. I like Q-Audio but you can also try Jensen IsoMax from Markertek. For a bit over 100 bucks it may be the best tweak most people are afraid to try (as in input transformers are bad for some reason). I don't think a battery to power a whole system is feasible but maybe you can get a generator and then filter it. Make your own dedicated line. Home Depot has all sorts of models for $200-1000. The smell of gas and the lawn mower noise may drown out your system, though.
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