Help finding a special inverter and or charger

So I have read that if you use the same 18650 based battery packs as Tesla motors uses and you only discharge them to 40% and only charge them to 70% they will last 40000 charge cycles.

My idea is to build a root celled and have a large freezer in it. I want to have 3 battery packs in there to run the freezer.

Each packs 30% would be sized to run the freezer lights and maybe a small fan for one day. I wish to have 3 such battery packs in there.

So on day one it discharges battery 1. on day 2 it discharges battery 2 and charges battery 1.  On day 3 it discharges battery 3 and charges battery 2. And so on and so forth.

I want to use an external BMS/ charger that is also an inverter or one that can communicate with the inverter to accomplish this.

Why, 1st to have a function system for decades. 2nd to lower future expenses, 3rd greater independence from globalism and supply chains.

The help I need is finding this BMS/ charger , inverter. Search engine are becoming counter productive.

Technical.
Estimating 1.6kwh hours a day
Will use about 400 watts solar
Will diy or find used 5.3 kWh battery packs.


Thank you for reading to this point and any help.

You are over-complicating this.  There is no need to alternate different battery packs.  Just parallel multiple packs to get the number of Wh of storage you need.

I'm already operating a freezer on my smaller 24V workshop system, which is in the workshop, not a root cellar.  I find I'm consuming about 2.0 kWh of power per day, keeping the inverter on 24/7, and running the freezer, lights, and some power tools.

Here are my system specs....

8 245W YingLi panels, 1960W wired 4S2P
Rolls 568Ah battery, three 8V batteries wired in series
Schneider Conext 4024 split-phase 120V/240V sine-wave inverter/charger
Midnight200 charge controller.

Has worked flawlessly now for a couple of years.  I started out with just 4 panels, then upgraded to 8 as time and resources permitted.  I wanted the extra watts when I really needed lots of power, like running the lead furnace, for bullet casting.