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Well I think the only way this powerwall makes sense is if you have an electric car and solar panels, so you can store up the sun energy to charge the car, and not use any grid power to do it. I just don't see this as a big market at all,
as you can recharge your EV at night when rates are low.
The weight of such stationary battery systems is not a problem, so seems to me lead acid is just fine, and lead acid batteries recycle very easily already today, whereas, not sure how that works with lithium.
In fact, you can use zinc-air batteries for this, safe and cheap.
And many other options, some safer than others.
I'm all for making cheap lithium batteries (to use in EVs) and I'll thank musk for doing it, but it isn't innovation or anything like it, as some seem to think.
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