Sounds like someone thought "EPS" sounded better than "loads". Not the best naming convention for a unit many (most?) use for far more than just emergency power.
BTW, I'm growing increasingly envious of all of you that can actually use your 6000XPs. My three units are still sitting in the box, on a pallet, in another building a few miles from where they will live, while they finish the new building. I feel like a kid staring at the Christmas tree, a month before the big event.