Winter overcast/clouds is an issue for PV planning In my sunny climate, and home designed for minimal power use, it's easy to add enough panels to fully charge the batteries every day, even on cloudy days. With 2350 watts I never run the generator to charge batteries anymore, I don't even have the charger hooked up. I just avoid electric cooking on dark winter days, and only do laundry and water pumping when it's sunny. Our winters are darker now, but still, 4 days of heavy clouds happens only once or twice a winter.
I read an article on a Budist retreat center in nothern Canada that was off grid; they added LOTS of near vertical PV for winter, so that even when overcast, they could make their daily power nut for the batteries, saving a bundle in genny fuel (and noise). You do get power when it's anything but dark, but you may need 5x or more the area in panels.