Most homes with solar panels and storage batteries on average are only 5 to 10 kw systems maximum. 75+ kw is more of a commercial small business or farm application that use large implement or storage sheds with lots of rooftop area for solar panels. The majority of homes in the US don't have enough south facing roof tops to have anything close to a 75 kw system unless they setup a ground array if they have large backyards or are in the rural areas.