I have a finished Basement with a kitchen, bathroom and washer and dryer. I also have a mini split heat pump on the basement. Upstairs heat pump has 30kw aux heat. I'm planning to buy a battery powered SUV. Not enough slots in a single 200-amp panel with 40 slots. See my response above for the rest of the story.Who in the world needs 400amps....yeah whoever did it f'ed up the solar.