Not enough solar to get to Vabs early enough in the day will cause defecit charging, as absorption takes a lot longer than most who do not bother checking with a hydrometer, will ever realize. The time also increases as the batteries age.
Instead they believe a blinking green light which only indicates absorption voltage was held as long as programmed to do so, Which could be very very wrong in a given usage, but more likely to be wrong the deeper the discharges, or the more partial state of charge cycles that have accumulated since the last actual full charge.
As chronic undercharging is not an obvious instant death, out comes the 'just fine' brigade who will claim X amount of years from their batteries and break their arms trying to pat themselves on the back when perhaps their system is only used 2 dozen times a year.
Off grid/ daily cycling is a whole different beast, and the Sticky author, gets it. Without the ability to add more solar, the battery bank's worst enemy is a prematurely initiated low voltage float stage, and a complacent human who believes a blinking green light somehow knows when their battery is full, when an actual measuring tool (hydrometer) would likely reveal a battery bank no where near 1.275.
But most rv's get to go home, plug in for a week and even 13.2v should get the batteries full if applied long enough, or if not plugged in, the existing solar will then be able to top up the batteries which were not significantly diacharged the night before.
Such users regularly report years of 'just fine' service from their batteries, but if they were full timing, their recharge regimen would be anything but, and short of adding more solar/ applying other charging sources, or using less electricity, the best solution for extending longevity would be to raise float voltage to ABSorption voltage as a premature float stage helps kill lead acid batteries, and is doing so right now, somewhere.
