I know that frequently doesn't change power.
But the engine makes less horse power at 3000 RPM compared to 3600RPM and the plasma cutter and large welder use every bit of horsepower the engine can make.
The generator will use less fuel at 50hz at low power utilization. I already know they do or I wouldn't bother.
When I was in Africa I took care of generators 50kw generators that ran about 15kw worth of lights. These generator sets were 50/60hz selectable. They would only run for 2 and a half nights on 60hz, before they ran out of fuel but when I turned them down to 50hz they ran 3 nights between fueling no problem.
At low load I expect 50hz speed reduction savings to be between 15% and 20%.
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