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Old 03-13-2017, 09:08 AM   #1
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Default MinnKota 36V Wiring Question

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.
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Old 03-13-2017, 11:00 AM   #2
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Originally Posted by belltek821 View Post
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.
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Old 03-13-2017, 01:41 PM   #3
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Thank you for your input so what you're saying is that I need to have a total of five batteries? 3 dedicated for the TM, 1 for my motor, and 1 for my electronics?
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Old 03-14-2017, 11:27 AM   #4
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Mine is wired the way you described. I wouldn't run the trolling motor with the switch on battery 2. I wanted to have an easy access incase I had drained the main battery too much to crank the engine. I didn't want to deal with 5 batteries and the weight so 4 works for me.
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Old 03-14-2017, 03:41 PM   #5
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Originally Posted by belltek821 View Post
Thank you for your input so what you're saying is that I need to have a total of five batteries? 3 dedicated for the TM, 1 for my motor, and 1 for my electronics?
for the professional install, yes. Mine is set up with one engine only battery, one electronics only battery (they can be combined in emergency) and 3 separate trolling motor batteries.

But like the other reply your set up will work (without exploding) your downfall will be that if you are running your electronics off of one of your TM batteries you will kill your battery life and likely end up with some issues with surges.
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Old 03-14-2017, 11:58 PM   #6
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If the 3 batteries are wired in series. You have to make sure the one you are running to the switch (as a back only) is the first one in the bank with the same common ground. Or you will blow lots up when you switch to all.


Run the whole boat (motor and electronics) off the single battery. With that one selected on switch. And only use both or the other battery On switch if start battery is dead. For emergency use

Having 5 batts would be preferred
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Old 03-15-2017, 02:23 AM   #7
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I run 3 and 1 all day. I have a switch connecting on of my TM batteries to my start/house battery in case the start runs low - which never happens unless I'm running three live wells. I did step my start battery to a group 27 deep discharge battery. works just fine. Keep adding batteries and you'll sink the boat and run out of space.

Here's the Interstate Start/deep Cycle Battery I use: SC27DM
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Old 03-19-2017, 07:43 PM   #8
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I have a MinnKota 112 lb thrust 36v with 5 batteries total. 2 for the OB motor and 3 completely separate for the TM. I have a 3 bank charger for the TM and find I can run all day and use the anchor lock with no problem on a full charge. The battery gauge usually still shows 50% + charge left.
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