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I have a max charge voltage setting on my charge controller . I have temp compensation set up at -4mv per cell as per the data sheet . Is there a max charge voltage the batteries will take when very cold ? I note the Absorption range is up to 14.6volt or 14.9 volt fast charge , should 14.9v be the highest even at low temperatures of 5 degrees and under ? or does it not matter and I should set at 15.5 v or something ?
Set the battery voltage to what is recommended by datasheet.
The mppt measures and compensates for the temperate itself. It is described in this thread here.
If you would like better temperature monitoring as it moves through the day. Add a Smart Battery Sense or something similar to the system.
https://www.victronenergy.com/accessories/smart-battery-sense
