They aren't when you factor in labor and the other components involved (wiring, breakers, terminals, steel box, etc). I've built my own system in my RV but will

They aren't when you factor in labor and the other components involved (wiring, breakers, terminals, steel box, etc). I've built my own system in my RV but will be going with racked batteries for my house due to how much time and effort they will save.