from a previous post:
in 2008 I remade my house bank with Fullriver 6v units as shown.
My boat does not have a generator.
Charging is handled by a large frame 200amp alternator with smart regulation, or at the dock by a 75A IOTA charger.
We typically are out 45-60 days during the summer in the PNW.
Anchoring 95% of the time.
The bank is sized to allow up to 5 days at anchor without starting the main.
I don't keep track of the number or exact depth of discharge prior to a recharge, but it is rare that it is less than 75%.
The bank is now 9 years old and as far as I can tell it performs the same as the day it was installed.
In 2008, Fullriver was just arriving in the mainstream, so it was a bit of a gamble, but I had found some fairly re-assuring comments from battery guru's in the know.
YMMV