I have a 17 1/2' deep-v and upgraded from a 30# 12v to a 71# 24v and absolutely hated every minute that motor was on my boat. Besides being just too fast, it seemed pretty had on batteries as well. I sold that motor and bought a 55# digital. Yeah, there are some days I could uses more but I'm glad I made the switch back to 12V. I still use 2 batteries and the digital has less draw so it works well for me.
One advantage to 12v is if my main battery dies, I can pull one of my TM batteries and just keep fishing.
I have done this twice.

