I recently powered up my 2 antminer S9 for mining bitcoin. Don't worry, this is all electricity questions.
So I have them running off a 240v single phase plug on a 30 amp breaker with wire gauge as follows: breaker to outlet 10awg; outlet to junction box 12awg; and junction box to individual plugs 12awg.
Now when I originally did the calculations for this I was going off the manufacture specs for power consumption which is 1330 watts each. meaning about 6.15 amps each. But after doing the install and everything,I stuck my clamp meter amp gauge on the wires. I'm getting 11.6A on one of the wires and 11.9A on the other. So if my math is correct this would mean that each one is drawing 2500 watts and that is WAYYYY outside of the amount of power this thins is rated to be able to produce. it is supposed to max out at 1600 watts.
The total length (from breaker to computer) is about 85ft total. I know there is a voltage drop of like 3-4 volts but that's fine... it's just confusing the hell out of me why I'm getting such high amperage readings. I have one more machine in the mail still, and had originally planned to run it on the same circuit, but now I'm concerned that I have to now make a new run for the entire thing to have all 3 on one breaker.
Also this just hit me: a 30 amp breaker means 24 amps is about the 80% max line. I'm drawing 11+- amps from each leg... so is that 22 amps on the entire circuit, or can I safely draw 24 amps on each leg of the circuit? Does anyone have any ideas how this is possible? Below is the spec sheet for the power supply from the manufacturer.