It doesn't.....or shouldn't matter what others have, because you probably wouldn't like it anyway. You have to fit your system to what you like.
I have 220 AHs, only because it fits my liking to charging approx. 2 hrs per day. I could possibly do it on one battery, but would push the limits on the 50% discharge rule.
I could have 4 batteries, and charge 4 hrs every other day, but I don't like the weight and maintaining and burning up 2 more batts every 6-10 yrs. If I wanted to bank some solar for those cloudy rainy days, I should have 6 or 8 batteries, but I don't like the trade off. Each to their own.
