Capacity almost always refers to the kettle. Widmer, for example, has a 250 barrel system. Running 23/7, it keeps six 750 and six 1000 barrel fermenters going.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk