It doesn't help. You'd account for the storage at opportunity cost (you could sell it back to the grid at night rather than using it). So you'd get the same eco

It doesn't help. You'd account for the storage at opportunity cost (you could sell it back to the grid at night rather than using it). So you'd get the same economics as just pulling power off the grid 24/7. At least for this application, the output was worth less than the marginal cost of the electricity during the more normal periods. If you kept it running like that, you'd be showing a loss even before amortizing the CapEx, so running it constantly would produce worse results.