12 and 24 volt from 2 batteries.

**skeetbum** · 11-07-2021, 07:11 PM

I’ve seen this addressed before but can’t find the post. I’m setting up a Jon that already has a 12 volt system. I’m changing out the 12v trolling motor and adding a 24 volt. I want to add 1 battery and pull 24 volts to the TM while pulling 12 volts from one of the batteries to power everything as it is already setup for. Am I out in left field or is this a viable way to make this work. Not much room and adding 2 more batteries would be tough. Thanks in advance……Skeet

**huntersdad** · 11-07-2021, 07:28 PM

To get the 24 volts you would take the positive from Battery one and the negative from Battery 2. You would then jump from the unused terminals which would be negative from Battery 1 to positive of battery 2. You would get 12 volts from running your wire positive and negative from the same battery. I don't know if it would be recommended since you would be putting an uneven draw on one of your batteries doing it that way

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**DockShootinJack** · 11-07-2021, 07:31 PM

Set your batteries up for 24 volts. How about a drawing. Name: 20211107_192955.jpg
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**Atimm693** · 11-07-2021, 07:57 PM

Jack's drawing shows it better than it could be explained.

It's not ideal but a lot of guys do it, me included. My bow graph and deck lights run off one of my trolling batteries.

**catchNgrease** · 11-07-2021, 09:15 PM

Same principle as hooking up a 2 bank 12v charger to two batteries that supply 24v

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**skeetbum** · 11-08-2021, 05:52 AM

I thought it was done by others, and I understand the uneven draw. My running lights are only used for a short time and the graph is usually turned off. This is my knockaround boat and most long term draw functions are done in my other boat with three batteries. Thanks guys.

**DockShootinJack** · 11-08-2021, 06:02 AM

Should be fine. Doesn't sound like you have that much 12 volt draw. The battery with the 12 volt draw will deplete a little faster when the graph and lights are used.

**icehouse** · 11-08-2021, 07:11 AM

Why don't you go the Dewalt battery route instead of causing uneven drain on your TM batteries?

**Barnacle Bill** · 11-08-2021, 09:03 AM

I've done that in the past due to no space in the boat. I had no adverse effects on electronics but then I didn't have any of the modern high amp units now available.

**DockShootinJack** · 11-08-2021, 10:10 AM

You could put a voltage / battery condition meter on the battery supplying the 12 volt load. When it shows dead then it is time to stop running and recharge. Getting discharged to the point of damage should be the only concern. Otherwise it is just doing what a battery is supposed to do.

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