Hello! As my family eagarly awaits our model 3, we are looking at getting a solar system for our house. We have a large south facing roof, so the question is, how big do I need to go. I know that is a complex question, but since I know next to nothing about solar, I was hoping some folks could give me some things to think about. Is it as easy as "as big as you can afford"! or is there more too it then that? Here in Washington the electric rates are tiered, with the first 800Kw a month being cheap, but then they expensive quickly after that. I would love your thoughts!