Howdy,
I am in the HUH? camp too.
I thought this was the tractor forum?
A diesel tractor operating properly, turning a PTO generator works fine. Then again, I too am not looking to run 24/7 all year either. Standby emergency use. When needed, it runs everything which is needed. It also depends on the time of year which I need to run on generator power. If it's mid summer, 99 degrees out, I am going to have a lot more load. If its winter, I can get by with less generation power.
My PTO generator puts out a very steady clean 240v 60Hz. Loaded, unloaded, cycling power demands and such.
If you get technical. The equation actually more around 1.82 hp = 1kw power
You can run a 50kw pto generator if you want. Usually any PTO generator of larger size, also spins internally at 1800 rpm having 4 poles in the alternator gen head. The smaller cheaper alternator genheads are 2 pole, and need to be spinning at 3600rpm to have the 240v 60hz.
The 540 PTO shaft conversion gears, to make 3600rpm spinning genhead add to the noise equation. A 540 PTO shaft conversion gears to make a 1800rpm genhead are quieter, and longing lasting rated. Also considered commercial grade.