How Many Days of Electricity for an Average American Home?

We already have the technology to re capture most of that energy through regenerative breaking riht, we have to invent a new technology. The real question is, what are you going to do with the energy? Charge a battery yet. What we do with cars. So that means you need enough batteries to hold 20 days worth of power for a typical american home. That's ltat a lot. Yet, that's massive. And that's just for one breaking event.