Depends on the capacity of the charger. Depends on the integrity of power transmission and connection.
When I set the Meanwell for 14.40 volts, it will saturation charge a 2-story Lifeline 31, instantly. If it was connected to three, four, ten dozen 31's then it would not saturation charge. That calculation is expressed in percentage of charge acceptability.
Let's use my R&S 3300 amp hour bank. To saturate charge it - I am using the Kubota and I am using the Lombardini. 770 amperes potential at 28.8 volts.
When power is out and a tropical storm or hurricane is near I am not going to screw with theoretical maximum lifespan c/20 calculations. That would be double-digit IQ stupid. I need to saturate charge those batteries, shut down let things cool off, tarp wrap then get the hell under cover.
Jesus, pulled over 200 lbs of lobster the last 2-days. In hurricane season, when power fails I am not about willing to lose four thousand dollars of lobster and another wad of cash for prized fish when the rain is horizontal and palm fronds are whizzing by at a hundred miles per hour. That battery bank must support three seven foot long Torrey freezers for one to three days. I have a small 120vac line run to the casita for a 5K wall A/C and power to recharge my Lifelines.
That's equals a huge power transaction. If power is restored, fine I have 60 amp 257 volt service. But it's usually out 3-6 days. When that Kubota starts up, it's all ***holes and elbows. The Turbo kicks in and 450+ amps goes into the cells. Unlike an emergency two genset saturated charge I keep the Lombardini silent. It is air cooled and noisy. A full recovery would then take a 2-day 2-step charge. First the Kubota then the Lombardini. I adjust voltage easier on the air-cooled unit (twist a knob) and the 385 amp 50 DN Delco saves about 3 gallons of fuel/hr than using the Kubota. $12.00/hr.
When power is restored I do a top charge and equalization if necessary.
It's all about power management that stays within the box of battery lifespan economics. They kids and my granddaughters rely on that income 101%. The three freezers hold about $11K in huachinango, lenguado and langosta.
