T-Pain Is On A Boat: Re: [Electric Boats] motor overheating

Thursday, June 18, 2009

Re: [Electric Boats] motor overheating

Bob,

5 kts at 90 amps sounds about right. The reduced power mode is caused by the controller thinking it is too hot. It is unlikely the controller knows the motor temperature. Which controller do you have?

Denny

----- Original Message -----
From: rbrt.beebe
To: electricboats@yahoogroups.com
Sent: Thursday, June 18, 2009 10:31 AM
Subject: Re: [Electric Boats] motor overheating

Denny, I don't know the Dia and pitch of the prop. I do know the prop is 2 blade and was mated to a Renault 8 HP diesel,My guess is the dia of 8"-10". The motor is a Mars, 48v I have measured the current. To move the boat at 5kts requires 90a/h,at 20a/h the max speed is 2.7kts. I cannot measure the shaft RPM. I have not measured the motor temp, it goes into the reduced power mode after about 15 min of motoring @ 90a/h. The conroller is not getting hot.
Thanks,Bob--- In electricboats@yahoogroups.com, "dennis wolfe" <dwolfe@...> wrote:
>
> Bob,
>
> More data would help us help you.
>
> Prop Dia? Pitch? Speed reduction? What motor? Voltage? How hot is the motor? How long does it take to get hot? How hot is the Controller?
>
> Can you measure motor or shaft rpm?
>
> Do you have a ammeter to measure motor current? Current creates the heat.
>
> Alex at Thunderstruck is a good resource.
>
> Denny
>
> ----- Original Message -----
> From: rbrt.beebe
> To: electricboats@yahoogroups.com
> Sent: Thursday, June 18, 2009 9:13 AM
> Subject: [Electric Boats] motor overheating
>
>
>
>
>
> I installed the Thunderstruck sailboat kit in my Hunter 27.
> I'm having problems with the motor overheating.
> I've adjusted the packing gland so as to have the proper drip for cooling and the prop shaft is turning freely.
> I would appreciate any other considerations/advice to resolve this condition.
> Thanks,Bob
>
>
>
>
>
> [Non-text portions of this message have been removed]
>

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