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When parking boat in a no load scenario, it would be good to solar charge LiFePo4 only up to only 80% SOC. This is good for battery life and when starting engine and leaving dock 100% is reached pretty soon anyway. Can this be accomplished with mentioned products?
yes you can just set the absorbtion voltage lower on the MPPT charge controller - exact voltage would depend on battery voltage and chemistry...
If you're not too fussed about how exact the 80% is, +1 to adev's suggestion. Getting the (and trusting) the 80% value on a BMV will require effort in setting up and possibly ongoing effort as well.
As far as I understand it, the voltage must be very low to stop charging completely, otherwise 100% SOC will be reached eventually. My idea was to use SOC instead of voltage. (well synchronized periodically by using shore power).
