Saturday, October 9, 2010

Re: [Electric Boats] Controller question

 

Kirk,
 
If you MK 101 still works, all you need to do is change the prop, not the motor.  The power output is determined by the controller, not the motor.
 
 
----- Original Message -----
From: Kirk Mason
Sent: Saturday, October 09, 2010 6:16 PM
Subject: Re: [Electric Boats] Controller question

 

Thanks for your reply, Dennis.  It helps.
 
I'm not trying to drive a Minn Kota motor with other props; I want to combine a Minn Kota 36-volt controller with an Etek or Mars-type 48 volt motor. Haven't decided on the prop yet, but the first one I have in mind is a three bladed 11 X 9.
 
But your reply does gives me good information to work with.  Sounds like I don't want to exceed the amp draw or I'll burn the controller.
 
I'll look around to find out what the amp draw is for the Minn Kota 101 at 36 volts, and compare that to the same spec for the Etek or Mars motor.  (I think they pull about 140 amps at 36 volts, but I have to recheck that spec, too.)
 
I'll hit "send" on this and go searching for the specs on the MK-101.  Thanks for the lead.
 
Back with more when I get more specs.
 
Best Regards,
 
Kirk 

--- On Sat, 10/9/10, dennis wolfe <dwolfe@dropsheet.com> wrote:

From: dennis wolfe <dwolfe@dropsheet.com>
Subject: Re: [Electric Boats] Controller question
To: electricboats@yahoogroups.com
Date: Saturday, October 9, 2010, 8:36 PM



Kirk,
 
You are missing the fundamental point, that is the controller puts out X power and that is all that is available to drive the boat, regardless of the motor it is connected to.  A larger prop on any motor will pull more power, make your boat go faster and maybe ruin the controller.
 
The controller, motor and propeller all must be balanced to work together.
 
The voltage and motor type determine the RPM, the prop and boat resistance determine the load at that RPM (amps).  The controller varies the voltage to the motor and therefore RPM.
 
If I were you I would experiment with different props, all the while carefully monitoring the amps the motor is drawing.  Do this with the boat running free, not tied to the dock.
 
Your first check should be with the stock prop, the boat tied to the dock and controller at wide open.  That is the amp limit you should not exceed with your experimental props and boat running free.
 
Model airplane props are cheap and can be easily modified to work on a trolling motor.
 
You will also find making a fairing for the round motor shaft will help more than you could imagine.
 
Details of my walk down this path here:
 
Start with post #212
 
Denny Wolfe
 
 
 
----- Original Message -----
Sent: Friday, October 08, 2010 8:13 PM
Subject: [Electric Boats] Controller question

 
Shouldn't the controller from a 36 volt Minn Kota Riptide 101# trolling motor be able to safely supply up to 75% power to a 48-volt Etek-type motor?

I'd like the groups opinions before I try it.

Thanks,

Kirk




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