Compare duty cycle, when you get on a big job on thick metal where you really turn the welder up and weld a longer time, the smaller welder will turn off when it get's hot. Duty cycle is the number of minutes you can weld out of every 10 minutes. A 5 min duty cycle is 50% duty cycle.
98% of the time you won't need many amps to do the job, but if I could upsize for only $100 or so. I'd do it.
David
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