[Public-list] Propeller question

[John Boor]

> No worries about being long winded... This is stuff I know
> nothing about and need to learn!
> 
> Gord #426
> Hi every one
I am not sure if I am the John mentioned below.  I did
comment on changing the prop diam and pitch to get more
RPM's for recharging my batteries.  If I am the one when I
rewired my boat I inbstalled a 95 amp alternator, a zantrex
612 multi stage regulator, a Zantrex Digital duo charge unit
to recharge my starting battery and a Link 10 battery
monitor sensor to monitor my 4 225Amp deep cycle batteries.
John Boor
MAHSEER #380
> 
> 
> 
> 
> 
> 
> > 
> > 
> > Hi John,
> > 
> > What you "may" need as was recommenced at a "Seminar on
> > Boat Electronics" that I recently attended is to change
> > the voltage regulator in the alternator to an External
> > Marine regulator. 
> > 
> > Anyone ever heard of this?
> > They can be adjusted to slightly vary the voltage.
> > You have to be careful varying the voltage so you don't
> > cook your batteries. 
> > The operating voltage area or envelope we operate in is
> > very small and it does not take much to cause problems.
> > Without going into a detailed explanation about the
> > difference between a regular "auto" voltage regulator
> > and a "Marine External" regulator, you may want to look
> > in to this. 
> > I changed my 13 X 7 prop on my Atomic 4 to 11 X 7 and
> > had it balanced. I would rather have gone to a smaller
> > change of 12 X 7 but the prop was in bad shape on the
> > ends, it was cheaper to cut the ends off and reshape and
> > balance at the time. 
> > The engine now runs at 1800 rpm in flat water at 6.2
> > knots.  The engine also comes up to higher rpm a little
> > faster than before but this does not help charging the
> > engine that much. 
> > I have 2 batteries:
> > 
> > One deep cell (house bank) and one regular truck
> > starting battery. Deep cells discharge slowly, and take
> > longer to recharge, than regular batteries. This is why
> > a Marine External Voltage regulator is better for boat
> > setups. 
> > Another problem is that we just don't run the engine
> > that much, we go sailing!
> > That is another reason the batteries don't get charged
> > much! 
> > If you have the original wiring harness on you Atomic 4
> > you may want to change a bit of it. The charging side
> > especially. The large orange and red wires in the rubber
> > plug near the engine. 
> > My boat had an Amp meter in the engine panel and I
> > changed it to a voltmeter and I replaced the wiring on
> > the charging side of the circuit. 
> > In order to have an amp meter (amp meter must be "in
> > series" with charge current) in your panel the wire runs
> > all the way up to one side of the Amp meter and back to
> > the engine. There can be a voltage drop in this setup. 
> > Some say go to a higher rate alternator, especially if
> > you have one of the old 35 amp alternators. This is an
> > option as was discussed at this seminar but the
> instructor recommended the advantages of External Marine
> > regulator. He also recommended changing the wiring to a
> > more modern configuration. 
> > The instructor gave out wiring diagrams and if anyone is
> > interested, I could scan and email them.
> > 
> > 
> > I hope this was not too long winded...
> > 
> > 
> > 
> > -bob
> > #560
> > 
> > 
> > 
> > 
> 
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