There is, but making that work is complicated. Math gets easy if you can for example buy power for free during day and then sell it night. 365.25 cycles a year. Say 10-30 years. 4000 to 10000, times your storage capacity. Even cents for each might be reasonable.

Now cut this at worst case to 10-30 that is purely storing power in summer for winter. And you really start to need very very very cheap per unit storage. Even multiply couple a times and it is still very tough.

Remember we are talking about cents per kwh here. Margin just isn't big.