Generator Sizing Calculator Generator Sizing?

Generator sizing? - generator sizing calculator

I have a welder, 150 amps and you need a generator of this force can be executed. can someone tell me what in kVA need to 45kVA I think would be a good thing, but you can see whether the right of instant messaging. Otherwise, you can tell me the watts that would be in a phase of 230 is required.

I have the link below to check data, but I'm not sure if this is correct

http://www.jobsite-generators.com/power_calculators.html

Thank you for your help.