For a lot of people worried about the environment, going off the grid doesn't need to pay for itself. It just needs to be affordable. Those people (and the usual tech geek early adopters) will be more than enough to fuel the market for the first few years.
The price of solar has already come down a lot and will keep falling. In a few year the price of batteries like these will come down too.
There's a good chance that looking back this will be seen as Tesla's iPhone moment, a gamechanger in the market.
And like Apple, Tesla isn't really doing anything "new". They're just taking the existing technology and turning it into products that are pretty and easy for people to buy and use.
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