Ok, thanks for this. What about the initial charge, could I bring them to 100% so I know what to set the Victron shunt to? Otherwise I'm guessing if they're at 90, 95 etc.? I've also been told bringing them up to 100% while it will shorten their life a touch, over thousands of cycles, some would rather bring to 100% to balance cells and sacrifice that bit of lost life with themAgain, a Magnum tech couldn't resolve the issue. I don't trust them. There was no AC coupling present and the AC coupling setting is enabled by specifying a custom battery type.
Other's with Magnum experience, one a former Magnum tech, directed me to the solution - select a default battery type or use CC/CV. I have shared that with you.
When charging with generator, absorption should be minimized and float should be completely avoided. When your battery hits absorption voltage, it will be nearly full. Since LFP experience no benefit from being fully charged like lead acid, it's least costly to charge between 50-90% vs. 60-100% as an example. That same 40% increase in SoC will cost you more because the generator is less efficient at lower power.
Note step 1:
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("I charge to 100%, all the BS you hear on YouTube about 80% is true, but we're talking about a difference of a year or two in the lifespan of a 20 year battery. In my world, the premature death of a battery because the cells were unbalanced (due to undercharging) far outweighs the slightly shortened life. Your call on that.?")
I'm not trying to play devil's advocate here. I just get frustrated and overwhelmed with how much information is out there and how much it seems to differ, coming from manufacturer techs, smart people on here ,etc.