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Posting a reply to: RE: Trolling motor Voltage and Thurst

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[QUOTE]Shep - 1/16/2009  4:04 PM

To answer some of your questions.

In a 24V TM, you use both batteries, wired in series. 12V + 12V = 24V. They are both being drawn at that rate. At full power a 24V TM will draw 1/2 half the current of a 12V TM of the same thrust. Thus the batteries last longer. Also, you are able to build motors with more thrust for a given current. That's why you can get 80 lb motors in 24 V, but are limited to about 55 lbs at 12 V.

If you want to extend the run time of that 12 V TM, add another battery and connect to the first in parallel. That mean adding a jumper form neg to neg, and pos to pos. As I said, this will nearly triple your run time. There are several post with good drawings in this forum. EsoxManiac, AKA Al , does a nice job with the drawings to explain parallel or series connections.

My advice is that a 55 lb 12V is plenty of thrust, and after running this setup for a while, if you find you need more runtime, add another battery in parallel.[/QUOTE]

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Shep

Posted 1/16/2009 4:04 PM (#355453 - in reply to #355340)
Subject: RE: Trolling motor Voltage and Thurst

Posts: 5874

I ran a 12V 30 lb TM on my old Rampage for years. Always had enough juice left in the battery at the end of the day. Why? Because I ran two batteries in PARALLEL. You nearly triple your run time this way, providing the batteries are fully charged when you start out.

To answer some of your questions.

In a 24V TM, you use both batteries, wired in series. 12V + 12V = 24V. They are both being drawn at that rate. At full power a 24V TM will draw 1/2 half the current of a 12V TM of the same thrust. Thus the batteries last longer. Also, you are able to build motors with more thrust for a given current. That's why you can get 80 lb motors in 24 V, but are limited to about 55 lbs at 12 V.

If you want to extend the run time of that 12 V TM, add another battery and connect to the first in parallel. That mean adding a jumper form neg to neg, and pos to pos. As I said, this will nearly triple your run time. There are several post with good drawings in this forum. EsoxManiac, AKA Al , does a nice job with the drawings to explain parallel or series connections.

My advice is that a 55 lb 12V is plenty of thrust, and after running this setup for a while, if you find you need more runtime, add another battery in parallel.