How much do you think a s7 would use over clocked to like 5.6 th/s?
I think it won't do it. but if it did it would be 5600/4 = 1400 to 1500 watts
rule of thumb divide hash rate by 4 and add 7% so 5600/4 = 1400 x 1.07 = 1498 watts this is for the s-7 at 5.6 th
for s-9 divide hash rate by 10 and add 10% so 13.5tb s-9 = 13500 /10 = 1350 x 1.1 = 1485 watts for the s-9 at 13.5 th
And I would be surprised to see a s-7 do 5.6th