Yes. An S9 will work on regular 120 volts. You will need to install custom firmware if it doesn't already have it, but that's easy. I underclock mine to 800 watts.
what firmware are you running?
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I know ur asking Derek but... I'm using braiins os
It was preinstalled by kaboomracks and it works flawlessly. Very easy UI and takes abt 10 seconds to adjust settings.
Braiins. I flashed it 3 years ago and never tried anything in else.