That is the same thing I was thinking after
reading Oso's comment. I have only had alternator
failure a couple of times over 30 plus years of
driving. Wny would they wear out so much faster when
used with microhydro?
--- Radu Babau <[EMAIL PROTECTED]> wrote:
> Hello Oso,
>
>
> You are saying that:
>
> > Most alternators are rated at 6000 rpm, so it
> should produce the full
> > 70 amps. You do need to subtract the excitation
> current from that, so
> > I would not count on anything above 65 amps.
> >
> > Spinning it at that speed, the brushes are not
> going to last very
> > long, 6-8 weeks would be my guess. If you cut the
> speed to about 3000
> > rpm, the alternator should still produce 50-55
> amps and the brushes
> > will last a little longer, say 12-16 weeks.
>
> I am wondering about this 12-16 weeks brushes life
> time. Some of us have
> cars which we mostly ride in the city, 90% of their
> life time, on which the
> normal motor speed is something from 1000-3000
> rpm's. Usually there is
> something like 1.5 ratio between the alternator and
> motor shaft. Other
> people are mostly using their cars to run on
> highways, which means 2000-5000
> rpm motor speed. In both cases the life time of a
> alternator (including
> brushes) is at least 5 years, even more. It is that
> kind of equipment that
> you only change once during a normal car lifetime.
>
> Am I wrong ? Am I right ?
>
>
> Radu
>
>
>
>
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