question

For one thing your charged voltage is high and from the readings it is never getting there so will never sync, which will help the soc drift.

Here is a good tutorial:

https://www.youtube.com/watch?v=mEN15Z_S4kE

Hi @Eric M.

You're talking quite a low drift here, like 0.8Ah/day average. Yet you've left the Current Threshold at 0.1A (default?), so it won't count A below that. You could try setting that to 0A, and also do a Zero Current Calibration.

The Ah reported isn't absolute, it's corrected. You could lift Charge Efficiency, but that's only adjustable by 1%, so 100% might be unrealistic. Or raise Peukert a little so that it gives more credit for your very low loads (if they don't happen all at once).

It's all very noble to want to never need to sync, but the only real check that SOC is accurate is when the batts are at 100%. And you have the means to define that to do it automagically. Sure you don't want it to happen every day, but batts are well-up-there in our imperfect world, and they can behave strangely, especially with temp variations and how they're treated. By all means tune it, but that Sync is the ultimate failsafe.