Epoch will tell you one 24v battery. I went with two 12v 105ah batteries because of the size. Also, I wanted one 3 bank charger. I didn't want to mount a 24v charger and 12v charger for the starting battery.
I had 3 lead leds for my trolling motor and switched to one 36v and couldn't be happier. Weight savings for me us huge on the front of my fishing pontoon.