You don’t need batteries for many solar systems. Only if you are off the grid. The excess power (if) produce on weekends would go though the meter running it backward. You have a couple months in many schools where you don’t need A/C. During the summer months while schools are closed, it very possible that they would have a surplus of power. Peak demand in California matches peek efficacy because it is a hot clear day with a lot of sun. If designed right they will have some power during a black out.
Or never have grid outages when it's dark, either due to time of day, or weather. Oh, wait; that would mean you ARE "off grid", at least temporarily.
10 days in sunny Southern California, due to Santa Anna winds. 7 days in Oregon, due to storm damage and flooding. 7 days in rural Northern California due to an unseasonable heavy wet snow & freezing temps. 3 days due to a forest fire taking out a major transmission line.
Suspenders AND belt...that's why we have THREE generators with a total continuous rating of 21KW...but no solar panels.