Never trust a salesman to actually know what they are talking about. When they do not know the answer, it is their job to appear as if they do, and they start spewing forth all sorts of crap.
And Consumers seem all too ready to believe the clueless salesman trying to make a profit off of them.
Consider one of the 24v power supplies as a charger.
Like the Meanwell SE-450-24
If you every have 120Vac available when you need to run this 24V motor, this can both recharge your 24V battery bank, and power the motor.
se-450-24You could just set the voltage once, and allow it to run only so long for battery charging, but you will need an Ammeter to know how long that requirement is, and with an Ammeter, can do a better job than any staged charger
