Finally have a clear cold day and am able to test my SmartSolar 75/15 installation. I have a pair of new 100ah 12v AGM deep cycle batteries that were only slightly discharged and a 100 watt 20v solar panel supplying the charge.
To the point, the configuration screen of the charge controller shows the absorption voltage set to 14.4 volts, but the app shows the actual voltage being produced is a consistent 14.67-14.68 volts. My BMV-712 Battery Monitor confirms the voltage as 14.65 volts which is close enough. Reading voltage at the batteries with my older voltmeter shows 14.58 volts.
My concern is the battery manufacturer says 14.7 volts is the high end of the absorption range and I don't want the controller to ever exceed that. Since the controller is already exceeding its own configured voltage, I'd really like to know if there's a risk of the voltage going even higher.