Why? If there's any possibility those homes will draw 100% of their power from the grid on any given day, then the cost of infrastructure will be pretty much th

Why? If there's any possibility those homes will draw 100% of their power from the grid on any given day, then the cost of infrastructure will be pretty much the same since a grid failure is a disaster. And there is a 100% chance they will, like my home is today, because 11kW of solar is making about 800W due to cloud cover which has persisted most days of summer.