I needed an "emergency generator once and figured something out the hard way:
If you buy a 5000 watt generator with a 240V connector, it's very likely that it is:
5000 watts / 240v * 80% safety (breaker) = 17A breaker.
So when you plug into it, you've got 17A on both "legs" of the deal.
This is LESS power than a champion 3500, which has a 24 amp 120V breaker. I couldn't run my AC for very long on that 5000 watt generator, but I could run it all day long with the champion 3500.
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