If you run a single 36V and for some reason it fails or goes to sleep, you're dead in the water. For that reason I'd either run 2-36V or 3-12v. I currently run 3-50ah for troller and a 125ah for motor. I carry with me in the boat 2-5' 4awg cables. If one of my trollers goes out, I simply tie it into my cranking battery and I'm back fishing. Just a thought.
Chad St. Pierre
Paulina LA 70763