Iʻm waiting for some info from Brian at LTV - I donʻt know what they consider the capacity of their current Discover batteries and I donʻt know how they configure the Sterling and Xantrex chargers. I used AM Solarʻs suggestions for Victron settings for AGM batteries: Charged voltage 14.1, Tail current 2%, Peukert Exp 1.12, Charge Efficiency Factor 97%.
Keep in mind that Victron defines 100% SOC as the point where Charge voltage goes above the setpoint, Tail Current goes below the setpoint, and it stays that way for 3 minutes. What I believe is happening is that on shore power, the Xantrex drops from Absorption to Float mode before the current gets down to 2% (thatʻs around 4 amps) - the float voltage is below 14.1 so the Victron never gets to its 100% SOC definition. Iʻll know more about this after I get the info from Brian and watch the system on a few trips.
I did have "Battery starts synchronized" checked, but as soon as I hooked everything up I manually dropped the % SOC down to about 90% to make sure I didnʻt hit 100% too soon - I wanted to see the 3 Victron values (14.1v, 4 amps, hold for 3 minutes) met and then manually synchronize. That worked fine while driving - I watched the voltage climb over 14.1, then the tail current dropped below 4 amps. But when the Xantrex was doing the charging, I had the voltage over 14.1 and the tail current was down below 7-8 amps - I walked away for a short while and when I came back the current was below 4 amps but the voltage was down too low - thatʻs why Iʻm guessing what I said about the Xantrex charge curve.
This stuff always seems to be funky and confusing at first, till you get used to the components in the new system. Weʻll see...