I think the longer a series string becomes, the likelyhood of mismatched cells/charging increases.
With low voltage parallel strings, the problem diminishes.... I think.
However, 1000 AH of lead acid runs to $3000 here in NZ to give the 20 percent depth of discharge of 200ah and maybe 5 years of useful life.
For the same price we can have the equivalent in Lithium cells that will do the same job, smaller with no maintenance, and even if the lifespan is similar, they still have these advantages anyway.
One faulty cell in a series string limits the whole battery to that what the faulty cell can provide, one faulty cell in a parallel config will reduce the AH by a paultry 6/7 ah, everything else remains the same., both current and voltage.
This allows the battery to be micromanaged, replacing faulty cells only, not the whole thing.
It would be uneconomic to have a hugely fancy and complex charge controller, but if one was not required, the economics are there and make more sense.
The likes of Prius/Tesla, they have to consider fast charging, regenerative braking power inputs, output currents, temperature etc, this may explain the complexity, but with off grid stuff, its a simple known current in, known current out thing.
Thats why I thought to divide the bank into two, and charge one while using the other, overcharging seems to be the bain of these type of battery, and unlike lead acid, will not be damaged by full discharging, and partialy full charging... maybe to 75 percent only.
The electronics to detect low voltage and when to switch out a bank is trivial, as is a timer to control charging time. Both sytems can simply control an old fashioned low tech change over relay even via the ubiquitous 555 timer..
The internet seems confusing at times just what these batteries need, but for off grid use, I think it can be kept quite simple. Even if each paralleled pairs were seperately and manually monitored with a voltmeter once a month by having shorting links, battery health could be monitored initially to see how its working out.
If there were a constant degradation then it would need looking into, but chances are they would perform reasonably well.
Even a real time battery capacity test could be automagically computed by monitoring output watthours, then charging the same bank with an added 20 percent or so, whatever the charge/chemical efficiency is.
The best scenario is just to connect and forget.
My lead acids have a few years left yet, but I do think these Prius packs are worth a try.