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I am starting a small welding business and will be doing some mobile repairs. I do mostly TIG in my shop, but when working on gates or heavy metal, I will be stick welding. I use a Lincoln Squarewave 200 mobile welding dallas ga. My question is should I invest in a small engine driven welder, OR buy a 7500 watt generator and run my Squarewave off that? Lincoln says 7500 watt is fine for that machine. If I buy a champion generator its only $750, vs 2k for an engine drivin welder. Any thoughts?