Originally Posted by belltek821
I'm getting ready to wire and install a Minnkota 36v TM. I have an 06 Sailfish 208 with 150 HPDI that currently has two batteries on a switch starboard side. I'm going to add two more batteries to the port side for a total of four. My intention is to utilize one battery for the motor and then wire the other three batteries in series to get the 36v for the TM. The question I have is do I need to remove the one battery I currently have on the starboard side from the battery switch when I wire the other two new port batteries in series to it? My concern is that when the switch is placed into the both condition, if I don't change it, will cause the motor to attempt to charge all four batteries. Not sure if my HPDI has enough amperage to tackle that while also running current electronics ie: stereo and depth finder. As a side note I'm also installing an on board four bank charger for off water recharging and will be placing three new identical batteries for the TM. Any ideas or additional input items would be greatly appreciated.
1 your 3 batteries need to be solely trolling motor batteries, if you attempt to one run as a house it will have a different load it will discharge at a different rate thus draining the other batteries at different rates and causing early failures of that battery as well as the others.
2. Having the battery switch hooked up to one battery in the bank will not charge the other batteries, so the load on you alternator will not matter. But, see above why that is a bad idea.
3. Having an isolated jump switch between one of the batteries is OK that you use in case your starter battery is dead. So you CAN leave that 3rd trolling motor hooked up as long as you only use that switch in emergency and do not use it in the both or 2 position.
4. You run the risks of mistakes like having surges by having that 3rd battery connected to the battery switch and can cause issues to the electronics in the TM. So, I wouldnt do it, even though theoretically it would work.