OK, so here are the generators:
The larger generator in back looks like this:
This is a Caterpillar XQ400 genset. XQ400 as in 400 kilowatts of electrical output. That’s enough, at 25% efficiency, to run the proposed operational LaWS anti-aircraft/missile laser.
The smaller generator in front looks like it might be one of these:
… which is a Caterpillar XQ100 genset producing, as may be surmised, 100 kilowatts.
So, there is certainly sufficient electrical power on display just in the larger generator to power the LaWS laser to operational levels, assuming they can actually get 25% efficiency out of it. As for the second, smaller generator? A few theories:
1) It runs what may be a smaller MLD laser
2) It provides makeup power because the LaWS doesn’t actually get 25% efficiency
3) It powers secondary systems like tracking sensors and mechanical actuators
4) It powers the not-insubstantial cooling system needed to safely shed 300 kilowatts of heat.
5) I bet there’s a Caterpillar rental agent with an interesting story to tell.