Lead Acid is pretty old tech. My car (Tesla Model 3) has a roughly 75kWh lithium-ion battery. Even with AC and/or a heat pump, that battery could run a rather large home for more than a day on it’s own. Their powerwall home battery is a roughly 17kWh battery that is stackable to build any size system you want.

Point of use energy generation and storage is a much bigger deal than I think people realize. I believe internally Tesla thinks this is many times it’s car business.