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Old 10-09-2013, 06:13 PM   #41
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Fighting that same concern, with a electric bow thruster, even using it in short burst, I have on two occasions tripped by circuit breaker. having twins and pretty big wheels we don't use it often, but it is nice to have it for insurance. If I was paying the ticket for a new one I too would go Hydraulic but like most things it came with the boat, so I was thrilled.

I've checked the connections and they are all clean, the breaker is correctly sized according the manufactures specs, so not sure what we are doing wrong. We try to use in it only in short burst less then 5 sec, but usually by the 3rd burst, you can count on resetting the breaker....which is of course down three sets of stairs by the thruster.

Suggestions ?

That does sound like it could be a wiring problem. Ours uses 2 AWG wire, which is pretty darn thick. Contact the manufacturer and check your wiring.
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Old 10-09-2013, 06:30 PM   #42
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Originally Posted by Dswizzler View Post
Fighting that same concern, with a electric bow thruster, even using it in short burst, I have on two occasions tripped by circuit breaker. having twins and pretty big wheels we don't use it often, but it is nice to have it for insurance. If I was paying the ticket for a new one I too would go Hydraulic but like most things it came with the boat, so I was thrilled.

I've checked the connections and they are all clean, the breaker is correctly sized according the manufactures specs, so not sure what we are doing wrong. We try to use in it only in short burst less then 5 sec, but usually by the 3rd burst, you can count on resetting the breaker....which is of course down three sets of stairs by the thruster.

Suggestions ?
I would suggest checking the thruster mechanism for a bad bearing, anything fouling the blades, or proper lubrication. Amp draw can go way up if there is any drag on its operation.
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Old 10-09-2013, 07:16 PM   #43
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Tucker, photo of interesting bow thruster, via Rick B.
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Old 10-09-2013, 07:38 PM   #44
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My dock mates thruster was doing the same thing. He solved it by installing a dedicated 4D flooded battery within a couple of feet of the thruster and eliminating the 12' battery cable run. His biggest issue was venting the battery gases. Problem solved.
Am I understanding that the thruster is connected directly to the battery...if so battery gases may be the least of his worries......as Bluto mentions below...

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I would suggest checking the thruster mechanism for a bad bearing, anything fouling the blades, or proper lubrication. Amp draw can go way up if there is any drag on its operation.
If the amp draw gets really high with no protection, I'm thinking fire is a concern...
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Old 10-09-2013, 07:40 PM   #45
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Come on. Each circuit needs protection.
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Old 10-09-2013, 08:00 PM   #46
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Am I understanding that the thruster is connected directly to the battery...if so battery gase may be the least of his worries......as Bluto mentions below... If the amp draw gets really high with no protection, I'm thinking fire is a concern...
No, they have a control box between the thruster and the battery, mine has 2 breakers for the counter rotating props.
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Old 10-09-2013, 09:02 PM   #47
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Actually starter circuits don't need protection if the battery is close enough.

I don't necessarily consider a thruster a starting circuit even if it is a glorified starter motor...

2 ga wire isn't very big if the run is more than a few feet...2/0 is more like what ay be used.
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Old 10-09-2013, 09:08 PM   #48
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Is the run time limit cumulative, do 4 15 second uses over say 2 minutes, reach a one use minute limit? I guess I`m asking about recovery time before next use. I don`t have thrusters, but now and then think about it, and how it would work in practice. Maybe the manual tells you.
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Old 10-09-2013, 09:22 PM   #49
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Am I understanding that the thruster is connected directly to the battery...if so battery gases may be the least of his worries......as Bluto mentions below...
We don't need no stinking breaker..man!!

This is a 55' boat; he moved the thruster battery from the engine room (a new dedicated battery) to a compartment in the bow which is 12' closer to the breaker, solenoid and thruster.
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Old 10-10-2013, 02:54 AM   #50
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2 ga wire isn't very big if the run is more than a few feet...2/0 is more like what ay be used.
Actually, you are right, I believe it is 2/0.
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Old 10-10-2013, 08:28 AM   #51
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Actually starter circuits don't need protection if the battery is close enough.

I don't necessarily consider a thruster a starting circuit even if it is a glorified starter motor...

2 ga wire isn't very big if the run is more than a few feet...2/0 is more like what ay be used.
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Old 10-10-2013, 08:28 AM   #52
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We don't need no stinking breaker..man!!

This is a 55' boat; he moved the thruster battery from the engine room (a new dedicated battery) to a compartment in the bow which is 12' closer to the breaker, solenoid and thruster.
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Old 10-10-2013, 09:48 AM   #53
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There should always be protection in every circuit to protect you and the boat if some type of failure occurs.

I.e. solenoid jams and motor stays engaged.
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Old 10-10-2013, 10:10 AM   #54
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As Dr. Ruth used to say...."Always use protection"...
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Old 10-10-2013, 07:00 PM   #55
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Tucker, photo of interesting bow thruster, via Rick B.
That wasn't my photo. I used a similar one for an avitar for a time but that photo is the result of someone else's great sense of humor.
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Old 10-10-2013, 10:43 PM   #56
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Jwnall (OP) doesn't have a thruster. That boat doesn't need one, she can spin on a dime and you can get it in to the tiniest opening. I'd drive it at 5:15 pm on I-95 between Fort Lauderdale and Miami.
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Old 10-11-2013, 08:39 AM   #57
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I'd drive it at 5:15 pm on I-95 between Fort Lauderdale and Miami.
A few more years, with the oceans continuing to rise, and you will probably be able to do exactly that! :-)

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