A smaller generator can't run the plasma cutter or welder. 7kw has just enough to run the plasma cutter and can only run the stick welder at about 60% of full power which is fine for pretty much everything.
To run the stick welder anywhere near full power would take a t least a 12kw generator.
Running 50hz at full power is kind of pointless I don't expect it to save a measurable amount of fuel and running at the lower speed will reduce generator output capacity.
Plus I installed a smaller generator in the form of the solar, battery inverter system. 180w of solar (expandable to 210w to 500 watts) and the 1000w pure sine inverter can take care of all the little stuff.
Then my 2000w samlex (not part of this build) can take care of the intermittent medium loads.
The smaller 30kw units were broken. Eventually I reconfigured all the generators around the camp so about 1/3 were no longer needed and I made them my spares. To include the lights, I wired them into another generator that ran tents 24 hours a day. When I got there most of the generators ran between 10% and 30% after I changed things around I had fewer generators running 50 to 60% load.
These were all US made machines.
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