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Batteries combined with solar have an ROI if there is no other alternative, like you're on Mars and need to go places and experiment, but the local utility doesn't service your neighborhood on Mars.
Solar is the cheapest electricity if you don't consider the fact that it isn't a complete solution and makes all the other sources more expensive. In other words, it's only cheapest if you make everyone else pay for it but are sneaky about how you pull that one off. It's like making purchases on someone else's credit card, but then bragging about how cheap it was.
You'll know when solar is cheaper when your utility invites you to pay less per kWh on your bill by opting in to "renewable" electricity. Until then, it's more expensive for those of us that live in reality.
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