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

Yeah, Ric seems to like that Giandel inverter.

http://tweakaudio.com/EVS-2/Inverter_Power.html

It’s a nice!

Why invert at all?

Your audio system (except possibly the motors for turntable, tape, and player), runs on DC. You just need a DC-DC converter, which are almost noiseless. Better yet, you may find equipment that runs on your house DC.

Of course, this means surgery on your electronics to bypass that noisy power supply. But it's minor surgery, suitable for DIY.

I use battery power for my phono / pre, and am thinking about converting to batteries for amps as well. As it is, my system is black - and SMOOTH. No sharp edges here.

Batteries forever!

I have used different batteries, my electrician-Audiophile friend set me up using a 

30 amp outlet using gold copper outlets , a special Siemens pure silver breaker from Germany ,awg10 Copper wire, and a 4 wire  and  common ground ,the other insulated isolated ground on its own seperate copper buzz bar ,it’s dead quiet a much blacker silent background,day or night .

Just a heads up about the portable lithium ion batteries units most of their inverters are 110 volts. I ve owned a BLUETTI I measured the voltage output at 109 volts. Make sure the piece of electronic you're running off the battery can run on that low voltage or you can potentially do some damage. My Nagra classic dac would run off as low as 100 volts same as my Aurender streamer. My new Lampizator DAC needs 115v and I contacted Don Sachs about my pre and amp and he told me he sets up his electronics to run on as low as 113 to 114 volts for heavy load days as he called it. I've found very few battery' units that have 120v inverters and if you draw over a certain number of watts (400 with the BLUETTI) the fan kicks in and is loud.