Batteries are not cheap, especially on industrial scale. And most batteries are not ecologically friendly. It makes far more sense to put all the power solar panels produce during the day to immediate use for maximum efficiency, there is no form of battery that exists that doesn’t have some kind of efficiency loss.z

Putting a battery on this is like building a water tower in your front lawn that only feeds your sprinkler, and you’re only filling it from a hose. You don’t really get any benefit out of it and it’s just easier to run the hose right to the sprinkler anyways.