In most countries, during most seasons and on most hours of the day you don't even get 80% efficiency on a sunny day! Heck, even in the most sunny deserts, the average daytime efficiency of a solar panel is barely 60%…
But yeah sure in fantasy land solar panels give you a daily average 80% efficiency on a cloudy day…
And I said 60% average on a cloudy day.
If you live in fantasyland where the “average on a cloudy day” is in fact the the value that exists in the Mojave desert, then sure…
But maybe you're forgetting that days aren't 12 hours of noon.
Maybe the “average at noon, including sunny and cloudy days, across landmass is 60%”, but that's very much not the same thing as “the average on a cloudy day is 60%”…
But then again, how does that relate to your previous points:
> you know solar still works even through clouds right?
> So you could say 60% efficiency on a typical overcast day.
We were talking about the impact of clouds on a particular spot, and now you're telling me that you're counting the average across landmass because it's never cloudy everywhere in the world…
I suppose it means you retract your previous statements about solar panels working well even in the presence of clouds?