How the mine gets its power is irrelevant. The point is that these vehicles are rarely stationary at any sort of base where they can charge. Most mines run 24

How the mine gets its power is irrelevant. The point is that these vehicles are rarely stationary at any sort of base where they can charge. Most mines run 24/7 (though often not at full capacity during the "off" hours). The duty cycle is much higher than buses and delivery vehicles.