Kohler 3 phase diesel generators johndeer 4045T  engines 
One of them is 57kw. Other 2 are 50kw
They have selector switches for 277/480
120/208 and single phase 120/240
All have been load bank tested and run excellent. Could be used for drone recharging if using the rated single phase 33.3kw  (see attached photo for drone trailer example) 
14,000 each
 7230 hours 2290 hours 3587 hours