Eco-worthy 20a MPPT controller

During bulk the battery voltage rises--there is no setting for that. There is an "aborption voltage" setting. This is usually called the "high voltage set point." Once the battery voltage reaches that, the controller starts controlling to make sure the battery voltage does not go above that, and because now the controller voltage is held constant (at something above the high set point) but battery voltage keeps rising, amps taper. That is called the "absorption stage."