Faan

Technically speaking conditions that will affect the life of your Lithium Iron Phosphate battery more is high tempreture and high charge rates however your systems Bms will controll charge rates and discharge rates there is one school of thought that claims you need give your battery a deep cycle once in a while however there is no rule of thumb on exactly how often you need to do that. The other school says let the BMS manage that and cycle the batteries according to your needs this will inadvertently achieve the same goal. However if you look at the Cycle curves of Lithium Iron Phosphate batteries you get more than double the duty cycles at 60%  dod than 80% Dod and for the Pylontech batteries they claim 6000 cycles at 80% Dod @25 degrees celcius.
Here is an interesting read https://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries

You can add another bank in parallel. Charge both to full charge separately and then add them in parallel. That way they should have the SOC.
It wont be perfect, but it will very close.

Hi All
Have a DIY LifePo4 bank with a Daly BMS  - no comms, connected to Multiplus II with ESS.  Would love to add a 2nd bank.
Is this doable without comms or does one have to have BMS with comms for multiple strings?
Thank you