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Unread 07-21-2008, 04:56 PM   #41
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Default Re: 12v versus 6v batteries in a 36v system

I might have run into a major set back. I carried my GC motor and outdrive off the boat to a machine shop today to see if I could get some kind of connecting sleeve or shaft made. He didn't even want to dry it but referred me to another shop that has done some serious work before. I'll try him later this week and see what he can do.
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Unread 07-21-2008, 06:14 PM   #42
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Default Re: 12v versus 6v batteries in a 36v system

well your not hurting for space to install batt's in a 17 foot boat so ck out your interstate battery buddy for the big 8d deep cycle batt's. they use them in big trawlers to run the whole house on these trawlers. for an example a58 ft off shore trawler has 6 battery boxes 2gen set and 2 engine sets now forward there are 16, 8d gell batteries to run invertors to run the whole house tv microwave etc people run these types of yachts up and down the east coast in the inter coastal water way anchor up at night and never run the gen set just peace and quiet oh! don't foget the misquitos the class a motor homes blue bird ,provost and other big motor homes have those 4d and 8d deepcycle gell batteries for the same purpose to run invertors they have batt meters to let them know how much there burning off but 3 of those big dogs should keep you trolling around for hours
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Unread 07-21-2008, 10:56 PM   #43
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Default Re: 12v versus 6v batteries in a 36v system

The difference between running a cart vs running a boat on batteries is twofold.

First there are physical resistance factors to consider. With a cart…, inertia is overcome with power. Once the cart starts rolling it actually takes less power to keep it rolling. A boat on the other hand will require a continuous or increasing power level to maintain or increase your speed.

Then there is the weight factor. When compared to a cart, a significant delta weight difference is obvious with respect to even a small boat. Pushing a boat around uses a lot of amps, even a small boat at low speed.

This can be done, it is done, and a lot of people like the quiet cruise. Me, I have a need for speed, on the water, on dirt, or on paved road.

Try this link for more info:

http://www.mindspring.com/~jimkerr1/sebebts.htm
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Unread 07-21-2008, 11:45 PM   #44
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Default Re: 12v versus 6v batteries in a 36v system

Welcome to the forum rileymon.........................
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Unread 07-22-2008, 01:11 AM   #45
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Default Re: 12v versus 6v batteries in a 36v system

We did a lot of speculative math on Lunkerlure's project, I am curious to see what it will actually do when he gets it going. I just want folks to know the calculations we did were based on other setups for a reference, Lunkerlure's boat could act totally different than what was calculated.
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Unread 07-22-2008, 08:53 AM   #46
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Default Re: 12v versus 6v batteries in a 36v system

If you have an outboard or outdrive you can install one of these:

http://www.basspro.com/webapp/wcs/st...002000_200-2-2

After you consider all the associated costs you will incurr trying to modify something else to do what this does..., $$ and time spent would be comparable.
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Unread 07-22-2008, 08:08 PM   #47
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Default Re: 12v versus 6v batteries in a 36v system

I thought about getting the engine mount trolling motor from bass pro but I don't think it would work on my project boat because of it being a net boat. The motor has to tilt all the way up against a plate to get the boat off the trailer and that would put the trolling motor in the way. The big engine mount motor would be nice so I could also put it on my big boat for offshore trolling with the price of gas but figured it would be tough switching it back and forth between the two boats.

I'm doing okay $ wise so far because I got all of the GC electronics and motor for $25 and I carried my motor to a machine shop today and it's going to cost about $100 to get it to connect to my boat outdrive. When I get it back it'll take me a little time to build some mounting brackets but I'll be getting closer to blast off.
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Unread 07-22-2008, 08:33 PM   #48
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Default Re: 12v versus 6v batteries in a 36v system

That's great!
Hey, anytime you can walk out of a machine shop for $100 .....
you did okay.
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Unread 07-22-2008, 10:30 PM   #49
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Default Re: 12v versus 6v batteries in a 36v system

My fishing buddy put one of the engine mount trolling motors on his 25' Century, center console. That is a nice set up, and when you tilt the motor where the blade slaps the surface water..., big fish think it sounds like bait fish schooling on the surface.

Now I'm anxious to see images of what you are putting together. The GC motor is not sealed for submersion, so how are you down/out rigging? Got sketches?

Here are photos of my water toys:
Attached Images
File Type: jpg P6270019.JPG (41.9 KB, 8 views)
File Type: jpg boat1_a.jpg (18.1 KB, 8 views)
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Unread 07-22-2008, 11:48 PM   #50
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Default Re: 12v versus 6v batteries in a 36v system

I'm going to connect the GC motor to the shaft going down into the lower unit of a 70hp evinrude. If I would have thought of it I should have taken some before and after pics. I guess I still can because I'm not far along.
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