Usually, the full panel current goes to the battery until the battery voltage reaches (pick a number) 14.4V.
Then, hold the battery voltage at 14.4V while watching the charge acceptance current of the battery (You should be able to deduce that from the PWM duty cycle, assuming full sun state). When the charging current drops to below 0.01C, switch to float charging, where the battery voltage is held at (pick a number) 13.6V.
I dont think you ever should Equalize a sealed battery, only wet cells with removable caps.