Howdy,
You also lose the conservative rating of 10kw 24/7. Like anything, you do not want to run a engine at absolute 100% all the time and expect it to run around the clock. Yes, I have put a serious load on my MEP-803A. A good solid 133% load. But, I am only following the instructions for working the unit. I also only bring it up to 133% for a short period like it says. I usually have it up at 133% for 15 minutes or less. The engine is working hard, its smoking, the temps are rising (oil temp, engine temp, exhaust temp)
I would rather take a MEP-805 and have a 12 wire gen head to run a clean 120/240 single phase