I think the point is that we only have enough battery storage to buffer the grid for 13 seconds. After that the batteries must be recharged (not clear how long that might take) before we can buffer the grid for another 13 seconds.Oils4AsphaultOnly wrote: ↑Mon May 16, 2022 3:42 pmYes, and as noted before, that's the daily time. So 4745 seconds total for the year.
Battery storage purpose is NOT to be a primary source of electricity, but an enabler for bringing more solar/wind energy into the grid.
We need a buffer of maybe 12-18 hours in order to balance diurnal variations in RE supply. To balance seasonal variations and prolonged doldrums we would need MUCH more, so much that batteries will never be practical; chemical storage is probably the only option. Chemical storage would waste around half of the energy round-trip, and would require us to design conversion processes that can work economically with intermittent energy input.