That is the setpoint voltage, not what happens before that is reached. A good size, heavily depleted bank will only need low to mid 13's to sustain a 30a charge.
During my pm4b-45's (powermax converter's) 15 minute bulk thingy, volts usually rise to about 13.8v, and then hang out there for a while, even though the setpoint is over 14.4v. That's at a 10.5% charge rate. 30a would be a 7% charge rate, and therefore take even longer to reach the setpoint. Now that's using a vector style profile, but the basic idea is the same... volts rise to setpoint during bulk, and the larger the bank, and the deeper the discharge, the lower the charging voltage needed to maintain the current limit of the charger.
Add to that the fact solar doesn't always work when one wants it to, so a heavily depleted bank, and a heavily overcast morning, followed by a sudden break in cloud cover, could very easily result in a sudden blast of full amps at low voltage, out of the controller.
