Sunday, August 10, 2014

Re: [Electric Boats] Electrical issue

 

Jeff,
 
Your problem may be that the motor is not getting the full voltage that it expects.  There is a drop in voltage that occurs in the wires between the motor and the batteries.  If the wire is long the drop is greater than a short wire.  If the wire is small in diameter the drop is greater than a thick wire.  In addition, the drop in voltage changes as the current changes.  At higher currents, the drop is greater than at lower currents.  So if, for instance, you have a long thin wire between the batteries and the motor, the motor may receive a voltage that is just barely large enough to run at low current.  But when the current increases, the voltage drop increases and the motor cuts out.
 
The Ray motors have a battery voltage monitor, so if you monitor the voltage while running slow, then increase the power, you may see a large drop in voltage.  You could also connect a voltmeter to the motor connections to monitor the voltage.  Or you could place the batteries very close to the motor and see if the problem still occurs.  If you already have short, thick (jumper cable style) wire connections, then the problem may be a bad motor.  Also, the Ray motors come in three different voltages, so make sure you have the correct number of batteries (connected in series) for your motor.
 
Gary Vander Hart
 
Sent: Saturday, August 09, 2014 7:59 PM
Subject: Re: [Electric Boats] Electrical issue
 
 

Have no idea what your referring to.
 
Sent: Saturday, August 09, 2014 5:34 AM
Subject: RE: [Electric Boats] Electrical issue
 
 

Hi Jeff,

You didn't provide a lot of information, but a few possibilities are a problem with a temperature sensor (motor too hot or a sensor that thinks it is too hot) or excessive voltage drop at high currents.  Excessive voltage drop can be due to a loose connection or a bad battery.  I would check all the electrical connections and then have the batteries tested.  Good luck.

Pat

From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com]
Sent: Wednesday, August 06, 2014 12:00 PM
To: electricboats@yahoogroups.com
Subject: Re: [Electric Boats] Electrical issue

 

Hi new to the board. I have a 20 foot pontoon boat with ray electric motor. All electrical wires have been replaced within 2 years. When I throttle from slow to fast power cuts out completely. Reverse or forward. Has anyone had this problem? I can go slow but once I increase to a certain speed engine cuts out.

Sent from my iPhone


On Aug 6, 2014, at 1:04 AM, "Stuart Armstrong sydesiderata@yahoo.com [electricboats]" <electricboats@yahoogroups.com> wrote:

 

Hi All

Thanks for the feedback.

Here is a bit more info hope this helps

I would be looking to get about 2 hours from battery as mostly I am sailing,

the battery's must recharge as I sail

I obviously need a generator to recharge when not sailing or no wind

And for domestic power

The alternative is buying both a Diesel engine and a generator

Why would a commercial outfit be different , we live on Desi 24/7

I don't believe weight will be an issue as Desi weighs 30 tonnes and at the moment we carry  1000 ltrs in two tanks one of which I would convert to battery space


Stuart Armstrong

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Posted by: "Gary Vander Hart" <gvanderhart@midco.net>
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