Looking in to getting a shed and sourcing out sub contract work, getting the shed being the hardest part, I've came across a couple of sheds one with 3 phase supply but the yard is running at full capacity of the supply, there has been an application put in for a larger supply but that's 9mths away, I'm looking into using a generator for additional power until then what size of generator would I need to run 2 possibly 3, 415v 400amp welders, and if anyone has any experience with generators how would I go about roughly working out running cost etc TIA