What is the maximum draw you use at once? I am on 240V 1~ and average 12kWh a day. That is for heating water, cooking,fridge, T.V., radio,computer, lathe,mill, power tools, compressor and welders,(arc,tig &mig). On a very heavy use day this may get upto 14kWh a day. My biggest draw would be my compressor.
For regulated power stand alone Diesel gensets are the best as they are tightly regulated between idle and full load with a very short fuel ramp. I have friends who live off grid who have Solar, wind and/or water power, the couple with big workshops get by with 8-10kVa gensets for when they need a lot of power. Modern machinery is pretty efficient.
Having said that I do have one machine that has a Parker - Crompton 5HP 1~ motor that has a start inrush of just under 19kVa! One day I will set up a bank of capacitators to stop the garage lights dimming.