As alternator speed has NOTHING to do with its output once it's just off
idle, why not put the right pulley back on it, correcting the problem and
saving the alternator bearings from overspeed, themselves...premature
failure.
Spinning an alternator so fast DOESN'T make it put out another amp....

COMPLETELY INCORRECT - look at the output curve for the alternator here
-
http://www.prestolite.com/images_alt...161U_curve.pdf

At engine idle, alt will be at 2500 and deliver 85A. With old pulley
off original alt, alt is only at 1500rpm and output is only 35A - so
quite a useful increase.

Output therefore CLEARLY varies considerably with speed and the spec
sheet I got from Prestolite has it continuously rated for 8000 rpm - so
it is not being overspeeded.

Fundamental AC - the higher the freq (= more rpm) the greater the power
that can be transmitted. Which is why aircraft AC systems are often at
400Hz - smaller kit but higher power.

No, you can't charge the house batteries in 5 minutes, either....(sigh)

At 110A a 920Ah battery is going to charge a hell of a lot quicker than
at 50A. I'll leave you to do the sums.

Higher AC frequencies are good for transformers, but don't have an effect on the
transmission of power reasonable distances and a boat is way smaller than that.
But since your AC is being converted to DC, the transformer argument is
irrelevant.

And your AC frequency will be pretty high start with -- there's more than one
cycle per rev.

"CS" wrote in message ups.com...
As alternator speed has NOTHING to do with its output once it's just off
idle, why not put the right pulley back on it, correcting the problem and
saving the alternator bearings from overspeed, themselves...premature
failure.
Spinning an alternator so fast DOESN'T make it put out another amp....

COMPLETELY INCORRECT - look at the output curve for the alternator here
-
http://www.prestolite.com/images_alt...161U_curve.pdf

At engine idle, alt will be at 2500 and deliver 85A. With old pulley
off original alt, alt is only at 1500rpm and output is only 35A - so
quite a useful increase.

Output therefore CLEARLY varies considerably with speed and the spec
sheet I got from Prestolite has it continuously rated for 8000 rpm - so
it is not being overspeeded.

Fundamental AC - the higher the freq (= more rpm) the greater the power
that can be transmitted. Which is why aircraft AC systems are often at
400Hz - smaller kit but higher power.

No, you can't charge the house batteries in 5 minutes, either....(sigh)

At 110A a 920Ah battery is going to charge a hell of a lot quicker than
at 50A. I'll leave you to do the sums.

Higher AC frequencies are good for transformers, but don't have an effect on the
transmission of power reasonable distances and a boat is way smaller than that.
But since your AC is being converted to DC, the transformer argument is
irrelevant.

I'm lost - I have not mentioned transformers???

And your AC frequency will be pretty high start with -- there's more than one
cycle per rev.

Yes, a 10 pole alt at 8000 rpm is generating AC at around 1332Hz. More
A can be produced at 1332Hz than at 50Hz.

Fundamental AC - the higher the freq (= more rpm) the greater the power
that can be transmitted. Which is why aircraft AC systems are often at
400Hz - smaller kit but higher power.

I was explaining why aircraft sometimes use 400Hz AC -- because they can carry
smaller transformers.

I won't disagree that you can generate (not transmit) more power by spinning the
alternator faster (up to a limit).

"CS" wrote in message ups.com...


Higher AC frequencies are good for transformers, but don't have an effect on the
transmission of power reasonable distances and a boat is way smaller than that.
But since your AC is being converted to DC, the transformer argument is
irrelevant.

I'm lost - I have not mentioned transformers???

And your AC frequency will be pretty high start with -- there's more than one
cycle per rev.

Yes, a 10 pole alt at 8000 rpm is generating AC at around 1332Hz. More
A can be produced at 1332Hz than at 50Hz.

"CS" wrote in news:1160536091.872456.50110
@m73g2000cwd.googlegroups.com:

At 110A a 920Ah battery is going to charge a hell of a lot quicker than
at 50A. I'll leave you to do the sums.




Hmm.....is the regulator shorted?....

Over and over boaters report on here how quickly their huge battery banks
drop off full current to 20A or 30A, tapering quickly to their
consternation as the regulators do their jobs, much to their dismay....

LEAD ACID BATTERIES CHARGE VERY SLOWLY....hours and hours.

You CANNOT charge a 920AH battery from 50% to full charge in the 5
minutes they all want to run the engine charging
batteries................yet.

However, the solution IS on the radar:
http://www.toshiba.co.jp/about/press/2005_03/pr2901.htm
80% in 60 seconds....
100% in 3 minutes flat....
99% charge recovery after 1000 deep, deep cycles!

Hmmm...the sums....950 AH new Li-Ion nanobeast charge in 60 seconds to
80% = 760AH....that would be 760A if we charged it in an hour but we're
gonna charge it 60 times faster than that so 760A x 60 = 45,600A X 14.2V
= 647,520 watts for 60 seconds divided by 746w/HP = 867HP for a
minute....Hmm....don't think the Yanmar 3GM is gonna like that....How
many v-belts does it take to drive a 45,600A alternator, anyways?? Can
we mount the 700KW alternator where the aft cabin used to be?

Maybe it'll charge it on your 110A charger running wide open for 950
divided by 110 = 8.6 hours....does that sound better? The new battery
won't even get warm at 110 amps...It's internal resistance must be in
nano-ohms to take a huge charging current like they do.

Thankfully, the 1920's technology lead-acid wetcell's days are
numbered.... Still no news I've found when the Nano-Li-Ions will be
marketed. I suspect the auto and oil industries are heavily pressuring
Toshiba and the other developers to flush the damned inventor and his
notes down the toilet like they did all the EV cars (EV-1/GM remember
them? All EV-1s were confiscated and crushed after dealers bitched they
wouldn't need constant, expensive maintenance and repairs, the dealer's
gravy train.) With THIS battery, the EV-1 would refuel in less time than
it took to refill the Ford Exploder at god-awful amps/volts and every
time you pressed the "brake" pedal, the huge power generated would
restore the charge on the new Li-Ion cells under the trunk, instantly,
not wasted trying to charge slowcharge batteries like now. Man, what an
electric car we'd have if the *******s in control don't bury it, again!

A side note: I've seen the webpage of the Dell notebook with the
defective Li-Ion battery exploding on some conference table in a hotel.
Very violent and very hot! It was about 4AH...Wonder what the fire will
look like on a 950A Li-Ion house battery?? Will there be any boat left?
There wasn't much notebook left...or table it was sitting on!

--
There's amazing intelligence in the Universe.
You can tell because none of them ever called Earth.