Sometimes I wonder why people like this even bother replying... the whole point of me making a post here is not so I can brag about what I already "understand".... it's clearly because I don't and have a question to ask and would like an answer.
Ugg I'm not trying to be a jerk man but you are just really missing some big electrical concepts and I don't want you to fry your unit. Let's say it this way, the D3 run's at ~1100 Watts on 13/13/13 at 120v that's 9.2Amps (1100/120 = 9.16). That's your power draw. If you are on a 15 amp breaker switch you shouldn't put much more on it, typically 80% of the rated breaker is the max an electrician will tell you (15 * .8 = 12 amps max). Anything more than 12 Amps on a 15 amp breaker running CONSTANTLY might pop the breaker switch. Now that is out of the way changing to 13/18/13 will draw more current, I'm not sure how much but what I will say it applying that much voltage to the board has the risk of overheating or instantly electrocuting the ASIC chips on the hashboard. Thus if you don't understand these concepts I'd highly recommend you not to go past the 13 setting.
Agreed 100%. Learning more about messing with electricity is key if you don't want to trash your gear.
That said, if you want to mess around and are more concerned about draw than damaging your D3, you CAN pick up a kill-a-watt and figure out your voltage/draw without math.