Re: Rectifier/Regulator circuit for an outboard motor?
From: George S (george996_at_No_Spam_olypen.com)
Date: 06/08/04
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Date: Tue, 8 Jun 2004 02:01:48 -0700
Have you looked into the small Solar panels used now for keeping a 12 volt
battery charged? With the day's getting longer it might solve your problem.
"Sunny" <sunny@nospam.net> wrote in message
news:qN9xc.19335$sS2.659737@news20.bellglobal.com...
>
>
> Ken Weitzel wrote:
> >
> >
> > Sunny wrote:
> >
> > <snip>
> >
> >> Well, that idea failed spectacularly! The capacitor exploded after
> >> running the boat at 3/4 throttle for less than a minute.
> >>
> >> According to the old analog multimeter I was using (forgot to take the
> >> DMM to the lake), the motor generates about 15v AC at idle, but up to
> >> 170v at full throttle - it runs the lights via a 12v DC wall-wart at
> >> half throttle and above! (but they go out below half throttle).
> >>
> >> I'm not sure how to get a constant 12v DC from an AC source that
> >> varies from 15-150v. Any suggestions?
> >>
> >> Given the feedback I've received on boat lighting regulations, I'm
> >> resigned to using a battery - but I'd like to keep it small
> >> (motorcycle type) and have the outboard motor recharge it.
> >
> >
> > Hi again Sunny...
> >
> > But I bet it was fun to watch :)
>
> I thought so, but number one son and the dog weren't amused :-)
>
> > Seriously, though, that's exactly what an alternator
> > does... the one in your car does, too.
> >
> > Can't guess your age but if you're old enough, you'll
> > remember when we could buy "AC adaptor kits" from
> > Canadian Tire. They were nothing more than a
> > fancy box with a switch that disabled the voltage
> > regulator. (and a little more) I fell for it,
> > bought one, used it to get started on the cottage
> > before hydro was in the vicinity. Start the motor,
> > rev it up, and use the output to run the power saw,
> > drill, etc.
>
> Never seen such a thing - did they at least give you a meter so you
> could adjust the engine RPM to something approximating the correct
> voltage for the tool?
>
> > So, all you're lacking is the voltage regulator.
> > OR - you have one in your motor that's faulty.
>
> Nope, just the two wires from the stator. I assume the regulator would
> be connected to those if I'd bought the electric start model.
>
> I looked at taking the regulator off one of the old outboards I have
> lying around for parts, but they all use a field coil to control the
> alternator so the regulator doesn't have to deal with such wide voltage
> swings. No field coil on the new motor as far as I can tell.
>
> > Easier question, though. If you're commited to
> > using a battery, why not just "buy" one from one
> > of your friends or family who are trading it in
> > for a new one?
> >
> > Out here, we get 5 bucks back from the dealer
> > when we return the "dud". Sometimes that dud
> > isn't good enough to trust starting in dead of
> > winter for our wives/daughters, but would be
> > fine for your light use.
>
> Believe it or not, that's exactly what I did for the last 20 years in
> the old boat - stop at Canadian Tire on the way to the cottage and ask
> for a traded-in battery. I got odd looks, but they always let me take
> one from the pile out back.
>
> The problem is there's nowhere in the boat to mount a full-size auto
> battery out of the weather, so it was always parked on the floor in the
> way of loads, and the connections were usually corroded when I needed
> lights. I bought several battery boxes over the years, but they
> inevitably got damaged by freezing or loading and unloading of building
> materials.
>
> The boat is mostly a work boat, but we also use it to get back and forth
> to the cottage in early spring and late fall. I'm tired of fiddling with
> battery connections by flashlight with fingers already numb from bailing
> snow and ice on a Friday night!
>
> > And if you lose it only for rare lighting,
> > maybe a couple of amps worth, likely one or
> > two dockside charges a year would be ample.
>
> Usually the case, but there have been too many occasions when the lights
> didn't work due to bad connections, cold battery etc. I need a better
> solution.
>
> I'm not getting any help with the circuit design here, maybe I should
> just order the regulator for my motor and buy a motorcycle battery -
> there's a spot I could put a small battery where it would be fairly
> safe. It'll cost more than I planned, but should work.
>
> Sunny
>
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