Can an Alternator power 2 wheelchair motors without a battery?

[programCurtis]

I'm taking a small walk mower and turning it into a tank drive r/c mower. I have two wheelchair motors. I have the controller and the wiring harness. It runs off of two 12V 55AH batteries. They are wired in series so it takes 24 volts. My question is if I can run the motors with a 24 volt alternator or do I still need a battery? If i still need a battery could use something with less Amp Hours?