I have the same rig as you, model year 2013. I have a 24v troller, and for me, it is enough. I am a recreational angler, but, if I fished in tournaments and/or harsh, windy conditions, I would likely have a 36v just for that extra capacity. So, I think it depends on how and where you fish. I had a 36v on my previous Puma, and do not miss it. And, as mentioned, your charger and requirement for a third troller battery are a consideration.