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Unread 07-20-2008, 03:42 AM   #31
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Default Re: 12v versus 6v batteries in a 36v system

SRM-4D battery is capable of 25 amps for 390 minutes but they don't give the voltage to which they are drawn down to.
There are a lot of unknown questions in this boat project for the golf cart folks to answer.
Is the motor speed or torque oriented?
What pitch is the prop, is it high or low RPM?
What speeds do you want the boat to get to?
If you use a controller and don't need full speed then you will have a longer run time.
If you only need 25 amps then you could run for 6.5 hours according to the Interstate website. You can go 3 hours if your amp load does not exceed 50 amps but what speed will that get you to?
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Unread 07-20-2008, 08:23 AM   #32
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Default Re: 12v versus 6v batteries in a 36v system

Thank you Nate for clearing up those questions. I was kinda trying to get around to some of those....
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Unread 07-20-2008, 09:26 AM   #33
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Default Re: 12v versus 6v batteries in a 36v system

I have no clue of the specs on my GC motor because I can't read the tag. So I'm not sure if it's high speed or high torque. If I could get 10-15mph out of the boat I would be very happy. Is it possible that I would have more run time by having 2 sets of 3regular size 12v marine batteries. 1 set to get me there and 1 set to get me back. I would need less than 1 hr per set to get the job done. Thank you guys for all of your help I know it's hard to know what's going to happen with all of the unknown variables.
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Unread 07-20-2008, 09:42 AM   #34
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Default Re: 12v versus 6v batteries in a 36v system

Exactly.....We can't tell, there are too many variables. We don't know the draw this motor will put on the battery pack. (bottom line) I am pretty confident that you will be able to find the right combo. But without you having a lot of technical info there is no way to do the equation. So you can either try to find a bunch of techy info or start experimenting. The 6 volt battery has been the standard of the GC industry for decades. That being said I would start with a standard pack of six 6v and see how long it runs. Then increase the # of batteries from there.
Remember these motors burn amps not volts......Boat speed is going to depend on prop size and pitch which will all directly effect the amperage draw....see how this has sooo many variables.
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Unread 07-20-2008, 10:07 AM   #35
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Default Re: 12v versus 6v batteries in a 36v system

I noticed some of the controllers are rated for 225-800 amps. Is this how many amps the motor will draw?
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Unread 07-20-2008, 11:35 AM   #36
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Default Re: 12v versus 6v batteries in a 36v system

The controller is the gate valve for the amps to flow to the motor. 225 is a minimum. 800 is a max. The motor draws the amps, so too small a controller will limit a motors ability. Where as too big a controller doesn't hurt or help. About 500 amps is all you will need. For your situation; find one rated for 36 to 48 volts. That gives you the option of runnig 48v by simply adding 2 batteries and changing out the solenoid.
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Unread 07-20-2008, 05:53 PM   #37
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What do you know?

Lunkerlure, in a case like yours I cover what is known so the question is "what do you know?"
For example: You know other guys are using up to four trolling motors. What speed are they are hitting and can you find out how many amps each motor uses? Don't ask how long their battery lasts because they don't measure the run time and the off time.
If a guy is using four trolling motors at 15 amps each to get 15 MPH then you know he is using 60 amps.
Tells us a little about the motor. Is it stock golf cart? Do you know the year and model of GC it came from?
Do you know what RPM your prop has to turn to get 15 MPH?
I don't see this project needing anything over a stock 225A controller.
I know a stock GC motor can produce 2 HP on 36V at 50A.

What else do we know?
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Unread 07-20-2008, 09:09 PM   #38
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Default Re: 12v versus 6v batteries in a 36v system

Thanks for the help Nate
I will leave this interesting project in your more than capable hands
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Unread 07-20-2008, 09:18 PM   #39
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Default Re: 12v versus 6v batteries in a 36v system

Here is what I do know. The guy I fished with last week had 3 trolling motors on his boat. 2 were 24v that we used for running with a max amp draw of 56 and each had their own set of batteries. The other we used for fishing was a 12v with it's own battery. We had 3 more batteries in the boat for spares and accessories. We could only get a speed of about 5-6mph which was comparable with everyone else. If I can get the GC motor to turn my prop shaft 2000 rpm's I'll get a speed of about 14mph. The motor I have came out of about a 1986-88 ezgo and is probably stock. I don't think that it has a controller but it does have a solenoid, wiper, shift switch, speed coils, some type of ac delco relay, and 3 switches, 2 on the shifter and 1 on the wiper.
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Unread 07-21-2008, 01:56 AM   #40
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Default Re: 12v versus 6v batteries in a 36v system

Scottyb, you were doing fine, I was hoping to show one method of guesswork. See, it turns out Lunkerlure knew more than he realized. Both of you have helped and I could not do this without you.

On with What Do We Know!
Two motors on 24V using 56 amps that is 1344 watts each so we have a total of 2688 watts used to run two trolling motors. That is approximately 3 horse power to go how fast? We don't know this just yet.
Motor from an older EZ-GO this is good also as the motor quality is probably higher in that older motor. I assume you will mount the electric motor in place of a gas engine on an out-board drive, am I close? I don't know the losses in the gear train so lets not worry about that right now.
For a golf cart motor to produce the same HP as the two trollers at 2000 RPM it will need to draw 56 amps on 48 volts. This just might be doable! The GC motor will produce that kind of power with ease so we need to look how long can the battery pack sustain 56 amps or over calculate at 60 amps to cover gear train losses.
I would still use a controller on this motor unless you are really on a budget but that old control system will eat some of your run time. I would buy a working used factory controller for cheap. A lot of modifiers looking to get a few bucks for them.
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