I made a personal decision to operate at a maximum high of4.0v and a daily/deliberate low of3.5v (inverter off). I have a 14s (48v nominal) 18650 battery bank.
The high of 4.0v/cell is set/controlled by the charge controller -absorb =56.4v (4.03v/cell) and float = 56.3v (4.02v/cell).
The inverter is turned on/off by an auxilary relay feature of the charge controller. When the battery voltage reaches 52.0v (3.71v/cell) the relay is turned on - which turns on the inverter. I can set this to any value I want in the charge controller interface.
The low of 3.5v/cell is enforced by turning off the auxilary relay at 49.5v (3.53v/cell) - which turns off the inverter. I can set this to any value I want in the charge controller interface.
Because I chose 4.0v maximum the charge controller enforces this, and in my case I don't need or want to balance on a daily basis, I set the Batrium just a little higher - at 4.05. This avoids top balancing.
See "Bypass Volt CV9 [ 4.05] v" on left column
If you choose my voltage range as your operating guide, you could set Batrium at 4.00 or 3.97 or something like that to kick off balancing at the max of the charge cycle. You should experiment and see what works best for you by adjusting this setting.
However... on most days I never reach the maximum. My system is designed to use PV power during the day as much as I can to limit the battery DOD. On average I only reach 3.8v/cell as the maximum so in that case, if it wanted to do balancing, I would have to set Batrium to 3.75 or something like that so that 'on average' the balancing would kick in.
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From your comment, I still sense that there is confusion about things. Please note that the Charge Controller does not do a 'range' of voltages... its only concerned with the top or max voltage. The bottomof the range is typically where your inverter shuts off or the load shuts off - so its the inverter off function or process is the point that sets the bottom voltage.
Batrium doesn't set or control either the top or the bottom voltage range - but rather monitors the whole thing and it might throw shunt-trip on over voltage or under voltage or might turn balancing on at a certain point in the range - but that's not the same as controlling the top and bottom. Note: There's a lighter version of balancing that you initiate mid-range called Auto Level, but that's an advanced topic and we can take that up once you get the basics in place - and there a nice youtube on it by @Daramor
IF your charge controller does not have the ability to turn your inverter on/off at a custom voltage range and your inverter is not settable, you could do this thru expansion board of the Batrium - like turning a fan on/off based on temp, you could turn the inverter on/off based on voltage. Or you can just live with the bottom voltage that is native to your inverter - its OK as long as that's within your design goals.