Battery-Powered Audio System Buzzing?

An update for any who are interested - I heard back from all the manufacturers of my gear.

- Don Sachs said no concerns for the preamp. It draws at most 150 W. Only issue would be if voltage drops. "You won't hurt the preamp. The preamp will run on 100 volts, but the regulated supplies will not regulate and it will not sound good.  As long as it sees 113 volts or more then it is fine."

- Schiit said that in theory their gear should work without issue to use battery power, as long as the batteries are supplying the recommended power. But they can't officially endorse it.

- Rythmik said "Keep the voltage within spec. For instance, 120V 60hz is better than 120V 50hz for the transformer." 

So my takeaway is that with a quality battery that provides appropriate power, there is no concern about using it to power audio gear.

Additional update: My basement system indeed does sound better on battery power. However, since my Yggdrasil OG DAC remains powered on all the time, the nervosa of constantly watching and recharging the continually draining batteries got to be overly annoying and not worth it to me. I'm now back to wall power both up and down.

Hi OP:

I'm curious if you watch your incoming house power.  Do you find the voltage keeps fluctuating or do you think it's more of a noise issue?

Best,

Erik 

@erik_squires That's a great question. I don't watch my incoming house power. I'm not sure how to do so, but that would be interesting to learn.

OP:
 

You can get any Kill-A-Watt type of meters.  Just plug them into a nearby outlet or get one of these.  

I like the latter as the N-E measurements are sometimes useful. 

Well the wall AC power seems pretty stable here at 120V. The differences I'm hearing could be other things on the circuit potentially. I mean it sounds fantastic as it is with wall AC, and I only preferred the battery sound on one of my two systems. But not worth the constant battery maintenance attention.