One problem is that currently the mix of solar is low enough that grid storage has to be sold as "backup" or "leveling". Grid storage that is actually used will

One problem is that currently the mix of solar is low enough that grid storage has to be sold as "backup" or "leveling". Grid storage that is actually used will for obvious reasons have a better cost-benefit ratio. If you still have three times as much gas as you do solar, why would you buy a battery?