Is that really a problem? How big is the difference between full-sun-on and cloudy?
Discussion
Well, our system is already a little too small. It was 104f two days ago, so we ran the AC too late and was quite low when yesterday it was 102f and partially cloudy so we ran out of at least one battery last night, and then today it was mostly overcast and in the 90s.
Our 4 batteries made it to 80% today. Usually we have crypto mining going all day and we eventually get to 100%, but we shut that down, plus barely ran the AC, and some other things, and still didn't reach 100%.