I'm thinking about getting a new trolling motor. A 55# will work for my boat, but I'm thinking about a 70#. It's a small open bow ski boat.
The only reason for a 70# would be to troll for trout with a down rigger. A 55# will pull my boat about 2.4 mph at full thrust. I need to go 1.8 mph to troll, but the 55# runs out pretty fast at full thrust.
I don't want the 70# because of the extra batteries. Currently, I can have a backup battery, but with a 24v system I wouldn't have room for two more backup batteries. And I'm afraid that two batteries on a 24v system won't last as long as two batteries on a 12v system... not sure...
What is your best guess:
1. How long can a MK 70# pull my boat at 1.8mph?
2. Do you think I could fish a 12hr day with a 24volt system?