JimK-NY
Discharging as you wrote perhaps 20% then recharging to 95% 7 years is good juju. Topping off every few weeks would have most likely bought you a couple more years of service life but it means hauling a tiny generator, a charger around and frankly to you would that have been worth it? You would have fared no better with wet batteries without doing periodic equalization's. And this is better? Your 7 years would have ended up like 3 years or maybe a bit less.
It's when batteries are discharged to 50% capacity that lifespan and charging are gravely impacted and percentages and voltages are more tender. IMHO only a wet Rolls battery would have gone seven years in comparison. Maybe a bit less if you decided to never equalize them.
I spend less than less than one minute twice a week monitoring my wet cells. Once a month I dip the weak sister cell to see how far it has drifted down from 1.260. Floating after I dip the weak sister cell, I top off running one hour at 14.7 volts. temperature compensated usually around 14.45 volts.
When I wanted to get way from it all..............................whtzuh battery horsepacking. Nothing to do but fish and prepare gourmet meals 30 miles from the nearest road. Trout, rainbow, brook, german brown, cutthroat and paiute cutthroa t and golden trout I went after them all.
Like campfires ya gotta either chop wood or buy a bundle for 10 bucks at a hardware store. Or, go around kicking out and gathering pine knots.
Lemmee look. Ah yes 13.34 float voltage from the BORG into the Lifeline. Good enough for me. Stretch the arm. Twist the dial. .8 amps at 14.4 volts and immediate decay down to .5 ampere. God this is killing me. I'd rather be sitting in a lounge chair watching golf?
Using 100% solar I have a sure cure. Camping above the Arctic Circle in summer. 24 hour sunlight. Look ma no generator.