Show me the setup
The non-car applications are the real game-changers once they get big enough.
Power companies are trying to increase home hookup fees to offset cheaper energy from solar panels. Existing battery systems won't comfortably carry you through a week of cloudy weather. You'd need to be in the 200+ kW/h range or stay connected to the grid and pay the hookup fees. At the moment, storage is at least 10x the hookup costs.
The interesting question is: When do increases in hookup fees meet declining costs of big batteries? That's when the power grid collapses into small co-ops everywhere you can place solar panels.