So for people who want specifics i think 4 75-100 amp hour sealed lead acid batteries. 48 volts seems a little more reasonable to me. motor could be a briggs and stratton etek pancake brushed 48v 150A continuous.
Plan for about 10 or 15 minute runtime at full power. 7200 Watts is close to 10hp. That is A LOT of power for a battery operated motor. Also FYI, I've made a 60 amp controller. That was challenging for a beginner.