Batteries are very expensive. It costs $10,000 to buy a battery system large enough to carry your whole house. And you're cycling the batteries every day, so

Batteries are very expensive. It costs $10,000 to buy a battery system large enough to carry your whole house. And you're cycling the batteries every day, so you'd be lucky to get 10 years use out of them. Even with the higher fixed charges mentioned in the article, it is still cheaper to connect to the grid than to buy the batteries.