I would rather put the limit at 15 volts because no automotive voltage regulator meaning alternator control is going to top out less than 14 volts unless the alternator warms up and the thermistor within the voltage divider network starts ramping control set point downward. Most Delco and Ford integral regs commonly start out in the 14.2 - 14.4 range at 25c. Motorhomes traveling long distances will arrive at set point limit for hour after hour. Hard to keep the Hatfield chassis batteries satisfied with a house battery diet and verce-visa.