I don't know the requirements but might be able to find out. I'll ask the resident technical specifications guy to see if he knows.
Remember, the TS features a soft start feature, so it's not going to have an immediate spike when you trigger it like you would see with other tools. You can actually hear it ramp up the juice over a couple of seconds when you turn it on.
Edit: The minimum recommendation would probably be 3500. Always plan on needing more generator than you think you'll need. 5000 would be even better. If you add a few other things, like a dust extractor, you'll need the extra capacity.