the formula for figuring amp output is divide voltage into watt output
and you will have the max amp output like this 4000 watt divided by 110
volt = 36.36 amp, also 12ga wire has a 20 amp capacity and should be
fine on a 100ft. run
if you have a 15 amp chop saw 15amp x 110 volts gives you 1650 amp
draw.
ross