Not sure. I think it should be 28A. You can't get more out than you put in (VxA). Most input amps on 140 migs are based off a max of 90 amps output. The 140 amps is theoretical at about a 1% duty cycle. This unit is 135 amp rated at 35% duty cycle...so it's not theoretical...and input will be higher even though its an inverter.