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From: Gene Gruender (no email)
Date: Wed Nov 07 2001 - 15:17:46 EST
>I haven't figured out where to mount a second altenator. A third grove
>in the pully would be tough also. Guess I could slave off of the raw
>water pump pulley.
>
>Jim.
I certainly wouldn't run it of the water pump, and it may not be practical
on every motor or engine compartment, but if you can, it's a wonderful way
to set it up.
I have pictures of mine at:
http://www.geocities.com/rainbow_chaser.geo/alt.html
A couple pointers:
1. Set up the house bank alternator to run as fast as possible. Use a
pulley ratio that runs the alternator at it's highest rated rpm at the
engine's highest rpm. The high speed end doesn't matter, except that you
don't want to exceed the alternator's top rated speed. However, it will
let the alternator run at the highest speed possible at low rpms, giving
more output at low speeds.
My first pass at the dual setup was with a 7" engine pulley. I got only a
couple amps at an idle, and had to go to around 1200 rpm to get anything
worthwhile. Second pass was with a 10" pulley (shown iin the above link)
and I know get 50 amps at an idle, full output at about 800 or so rpm. I
makes quite a difference.
2. You can run up to about 150 amps off of a good 1/2" belt. It's at the
limit, but it will work. I use 2. I figure they will not only last
longer, but if I break a belt it's an inconvenience I can deal with in my
own time. With one, it's an immediate problem.
3. The load on the crankshaft bearing can be a problem on some motors. My
3QM30 Yanmar says not to do it, but it's a pretty bulletproof motor and in
about 2000 hours had shown no problem. If you have room, I'd put the 2
alternators on opposite sides of the motor to balance the load on the
crankshaft bearing. I didn't have room.
Good luck,
Gene Gruender
Rainbow Chaser
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