Lead Acid batteries can keep a house running a blackout and are dirt cheap, they are just heavy, beyond that the technology for home batteries has been around for decades, just not any need for them.

I don't see a particularly demand from consumers for a home battery unless it's part of a renewable system and that's going to be most cost effectively done one a large scale because home owners can't maintain solar panels and wind turbines reliably. They need maintenance and the home owners are going to skip that part often as well as all the extra costs of installing renewable energy at a home vs a nice open field with commercial access.

We need solar farms, battery farms for storage, it's only going to cost more to decentralize ALL of that and we still need to upgrade the grid as well as get a lot more renewable power online.

We have enough to do that home batteries are not going to be a thing for normal people and by the time they are, they will probably be solid state batteries, nothing like what Elon is making.

Lithium ion is hitting it's power density limits and breakthroughs are not driving it upward anymore. It's time for a whole new battery platform or fuel cells that are cheap and work reliably over and over and over.

We still need Tesla and all that, but it's completely premature to push inferior battery technology on the masses when we know there is a lot of potential out there for major breakthroughs that would make home batteries like this virtually worthless.. as tell as that big factory Elon bought.

In the end lithium ion just can't cut it and power demand is generally going to keep rising. We need a faster charge, faster discharge, long lifetime and reasonably nonvolatile solution.

The simple solution is to just build the grid up and stop worrying so much about portability. Cars could be powered directly by electric with little need for large batteries, it would just take large infrastructure investment, which could also go hand in hand with the massive power grid and telco upgrades that we need.

Basically we say.. well battery technology is just too slow.. we don't need them.. lets make electric roads that cars just pull power from the grid from and upgrade the grid and add more capacity.

It's a completely practical way to replace the majority of automobiles and trucks in any country and the we'd had the technology since the late 1800s in the form of the electric trolley. Yes, that's right, the electric trolley was around before the turn of the century.. amazing to think we had electric mass transit before the automobile was made viable. Took quite awhile to get a working combustion engine... all those stupid moving parts. Electric was vastly easier and more reliable and we'd probably have gone electric back then had cheap oil not hit the market because the only other option was steam and horses.