The system does NOT use SOC to change charge states, all chargers use voltage and thus the MPPT also use's voltage and from your pictures you are reaching 14.23 volts and the mppt unit will then switch from bulk to absorbtion for 1 hr and hold that voltage then go to float (depending on battery selection settings), If you are unsing a BMV battery monitor then under battery settings in that unit change the charged setting to 14.1 volts and then the SOC will reset to 100% when ever the voltage reaches 14.1 volts
After watching the charger go through all stages of charging today I think I have the answer & solution.
The charger runs in "Bulk" untill the charger gets to the 14.6v Absorption setting & continues at that rate for 2 hours thereabouts.
Unfortunately due to the voltage drop through the 6 metre cable from the charger to the battery, the charge rate is only 13.11v so not really getting a good charge.
After the Absorption phase the charger goes to Float & runs at 13.6v which is only 13.1v at the battery so does pretty much nothing else all day.
This is the final voltage for the day & only gets the battery back to around 80%.
Instead of changing the settings to compensate for the losses which could overcharge the battery, I will move the charger from the solar panel & position it next to the battery with minimal length cable.
This way the charger will deliver what it should & extract more from the solar panel, at present the power from the panel is being throttled back as it's seen to be not needed.
An alternative would be to install a Smart Battery Sense on the battery. This will ensure the charge controller is seeing the true battery voltage rather than at its own terminals.
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