I think there's a confusion between amps at 12v and amps at 120v. Watts is a better measure than amps because of this.
The Honda 2000 series is called the 2000 series because it puts out 2000 watts. 2000 / 12 = 167 amps at 12v. Of course there will be some loss but it'll surely put out 100 amps at 12v which is a good amount to charge battery banks on many types of trawlers.
The Honda 2000 puts out 1600-2000 watts at 120v not 12v.