How? There’s a significant portion of the world/year where duck curve evening peak is after sunset and PV alone is never feasible and so batteries/wind/etc are necessary.

I was considering "duck curve" and "overnight" to be separate categories. Were you not? Then I will rephrase to say that excess panels solve the part of the duck curve that does not overlap "overnight", so the problem is reduced to just "overnight".

I do consider them separate, but the duck curve peaking is in the 6-8pm range typically before falling off to overnight baseload. 6-8pm is frequently after sunset. That’s what excess panels does not help, and is still separate from what is typically meant by “overnight” in my experience.