On 7/26/2010 4:28 PM, Matt wrote:
> I shoulda just gave the whole story up front. I cart off timed out 24V
> batteries from work (they were paying to dispose of them!) They still have
> good life in them and I was going to use it to power my canoe on early morning
> fishing jaunts. They make 24V trolling motors, but I was looking to just get
> a cheap used one and you rarely find the 24V used - plus they are usually much
> higher power motors.
>
> Some airplanes have a "cold start" switch that will put your typically
> paralleled batteries in series for a little extra electromotive umph when very
> cold. I guess the starters are engineered to accept this higher voltage
> without serious problems given the limited times that would be used.
>
> Matt
>
> ---------- Original Message ----------
> From: "gerry brazil"<gerrybraz@cablespeed.com>
> To: "'Matt'"<mbarre@juno.com>,<shop-talk@autox.team.net>
> Subject: RE: [Shop-talk] Electrical question
> Date: Mon, 26 Jul 2010 15:11:50 -0400
>
> It should run twice as fast but half as long ;-)
>
> Whatca gonna do? Water Ski?
>
> -----Original Message-----
> From: shop-talk-bounces@autox.team.net
> [mailto:shop-talk-bounces@autox.team.net] On Behalf Of Matt
> Sent: Monday, July 26, 2010 2:38 PM
> To: shop-talk@autox.team.net
> Subject: [Shop-talk] Electrical question
>
> I know some of you guys have good electrical backgrounds...
>
> Any guesstimates on how quickly a 12 volt trolling motor be fried if
> operated
> somewhat judiciously at 24 volts?
>
> Thanks,
> Matt in GA
>
Starting writing up a response for an emergency use of 24v for a 12v
motor, but you want to run full time on 24v. My take is 24v will fry a
12v motor pretty quick. If you do this limit the throttle to about 1/4
or 1/3. In theory at roughly 1/2 throttle the motor will be fine, but
the rheostat in the throttle and the feed wires will burn out since it
has to dissipate much more heat.
Peter T.
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