As per your recommendation, I have now set up a looooooong absorption time and also a tail current in the Victron solar charge controllers. We still have 3.4V/cell set as our absorption voltage.
And because this is such a low voltage, the absorption time and tail current can trick the chargers to prematurely go into float mode. This will then leave your batteries only partly charged. All thanks to some clouds...
Watch this video to understand how to charge LiFePO4 consistently:
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And here is the link to the graphs and data I showed in this video:
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