no..but having one as a backup is nice as inverter/chargers seem to have more than their share of failures.
Agreed , the best seems to ne the portable units with a timer built in.
Most are 10-12a and are by far the best bet for recharging a battery that has gone DEAD, not down 56% 70% but down DEAD.
The fancy chargers need some sign of life from the batt to begin to recharge , these just need to be clipped on.
Have an interior light stay on in your car for a week?,,,
similar can happen to noisemaler , thruster or windlass batts .
Stuff happens , a stupid timed charger is one cure.
A batt drawn down to 100% will recharge but will never have its full abilities restored.