Yes,it's a just in case we don't have enough power LOL.
I've wanted mono blocks back there for a few years so I traded in my 4B-SST on them.
28's up front for the mains And 7's defending the back door.
And if that's not enough we have the 60a(240v) Torus and a 20a(240v)Torus as some more back up.
Last but not least for our first line of defence we have the EP-2050 for whole house with a EP-2775 ground filter.
I think I'm ADDICTED

,LOL.