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Wiring question for 24V TM

Old 02-03-2007, 11:25 AM
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Default Wiring question for 24V TM

I am rewiring my TM and will be using a 24V (-2- 12V Batts in series) and am not sure I can connect my FF and GPS to one of the batts without creating an over voltage situation. My starting battery is in the stern. The batteries will be in the center console and this makes it easy to connect the FF w/o having to run the wiring through the channel back to the starting battery by the engine. I am aware that the batteries might create a low voltage situation for the FF and GPS but I probably won't be draining that much power off the trolling batteries to cause a shut down in the FF/GPS. Anyone hooked up like this or should I run them back to the starting battery? ;?
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Old 02-03-2007, 05:17 PM
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Default Re: Wiring question for 24V TM

A 12v battery is 12volts across the [+] and the [-] posts. That never changes, regardless of how you arrange your batteries. It was 12v when you bought it, it will be 12v no matter how you use it, configured in series or in parallel with other batteries.

So, yes, you can connect your accessories to a single batt’s [+] and [-] posts and get 12vs off it even when that batt is used in series for a 24v application. DON’T DO IT. In a 24v deep cycle application it is much, much better to have two batts that are identical, and discharged identically, too. Connecting your accessories to just one of the batt to get 12v makes that battery’s drain different form the other batt.

A possibility is to get an AGM battery for a starting batt and running a pair of wires (+ and -) up to your console so you have 12v at the console for whatever 12v accessories are there. Use a small distribution/fuse block with that 12v feed and you are ready to go…up until you drain your starting batt totally dead. Then you aren’t going anywhere.

An alternative is to branch off of your 24v trolling motor batts and step down to a 12v feed. My whole boat is 24v everything. Well, almost everything. My Icom VHF is 12v, so I use one of these:

http://www.newmarpower.com/dc-dcconv...sstandard.html

I hope that helped, or at least gave you something to think about.

Good luck!

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Old 02-04-2007, 09:55 AM
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Default Re: Wiring question for 24V TM

There is another solution. Although the advise to match the trolling batteries has applied in the past, using a Trollbridge24 negates that rule. A Trollbridge puts the two (or 3) batteries in parallel when the trolling motor is not running. So if they have been unbalanced by taking some power from the 12 volt terminal, they will be equalized when the TM stops. Putting them in parallel automatically allows you to connect them to the alternator on your outboard and extend your running time by charging them at 12 volts. Many report that the trolling batteries are already fully charged by the time they get back to the trailer. You can see the details at http://www.yandina.com/troll24info.htm
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Old 02-04-2007, 10:09 AM
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Default Re: Wiring question for 24V TM

Appreciate the good info guys. I think I buy into the first option and given the short run, I can put a small distribution box under the console and solve the problem just as easy. My only thought using the trolling batteries for the FF and GPS was to isolate them from the charging system of the engine. Thanx
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Old 02-04-2007, 11:43 AM
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Default Re: Wiring question for 24V TM

yandina - 2/5/2007 6:55 AM

There is another solution. ... www.yandina.com/troll24info.htm

Yandina – thanks for the info. I am only mildly familiar with your marine electronics products, was not aware of the Trollbridge. Good idea. And welcome to the forum!!!

The THT forums are very well organized. In order to prevent your messages from being overrun with notices of ‘spam’ because you are a manufacturer, it would be a good idea for you to check in with Wiley, the top dog on THT. And he can help you get set up with your own area on the THT forum.

Again, welcome to the THT forums! Hope to see you are here more.



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