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From: (no name) (no email)
Date: Mon Feb 11 2002 - 12:52:39 EST
Gene Gruender writes:
>Very true. I do have one. It's probably worth noting, though, that
>even a
>real marine high output alternator won't begin putting out any until
>maybe
>1000 rpm (alternator speed), not much until maybe 1500 rpm alternator
>speed, and it'll have to get to 2000 or so to put out serious
>amounts.
>That is why running a 2 to 1 ratio at an idle won't get you much, if
>any
>output. I'm not familiar with them, but I would expect that if you
>got a
>honking big truck alternator rated at 200 amps, you're still not going
>to
>get much at the speeds we typically run our engines at due to the
>reason
>Lew mentions. It may put out 200 amps, but not until you really build
>up a
>lot of speed.
Most diesels need to idle somewhere between 1,000RPM-1,400RPM to get
around the glazing problems, so with a 2:1 sheave ratio, 2,000 alternator
RPM is NBD.
A 2:1 sheave ratio on a typical L/N 4800 operating at 2,000 RPM has an
output of 120A; however, it peaks out at either 140A or 160A.
That unit will definitely require a dual groove sheave drive.
Lew
S/A: Challenge, The Bullet Proof Boat (Under Construction In The
Southland)
Visit: <http://home.earthlink.net/~lewhodgett> For Pictures
There are no problems, only varying degrees of challenging opportunity
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