"capacity"? You mean if the sun was shining on every single solar panel in the world
Even on a mostly cloudy day my solar panels produce about a quarter(1/4) of their normal output. Enough to run the house loads (frig, freezer, PC, lights, tv, etc).
I cut household electricity CO2 footprint by another metric ton this year. Soon.my PV will be on a solar tracker, that should reduce non-food related CO2 footprint to near zero.. I will be the first person in my republican dominated city to achieve a near zero carbon footprint house. Someone's got to break the mold, and leave FF behind, I hope many others will follow.
P.S. My residence along with the city and most of South Florida will be underwater one hundred years from now. (unstoppable sea level increase). You would think they would sit up and take notice as the bi-annual king tides are now flooding the streets in front of million$+ houses, might give them a clue. But no, blinders on, full speed ahead, buy that big ass SUV, Yacht, waste energy, burn those fossil fuels unending (And seal a watery fate.)