I'm working on a project where we want to predict the future battery degradation using the historical battery data. Now the battery capacity is an important value in this equation. I have done some research on the workings of batteries, battery degradation, and more, as I'm still quite new in this field.
This is the setup I'm working with: 4x Victron AGM deep Cycle batteries, 12V, 230Ah @ C20. Here is a link to the battery datasheet: https://www.victronenergy.nl/upload/documents/Datasheet-AGM-Super-Cycle-battery-EN.pdf (article number: BAT412123081).
Because the current capacity is not directly stored (as far as I could see), I saw that I could calculate it with either a constant current or constant power load. However, I don't have either in my situation.
Are there other ways I can get/calculate the battery capacity, or am I maybe doing something wrong?