well let's do the math, you can fill in the blank
assuming you're running it at 1 ohms and getting the full 1100 watts out of it...
(1100/_____) * (100/90) = ?
_____ = voltage, somewhere between 12v and 14.4v)
d class amps are about 90% efficient?
it shouldn't end up being much more than 100 amps.