Kohler 25/30 kw 3 phase [RE-wrenches]

Fri Apr 6 10:09:47 PDT 2001

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Hi Charlie,

Thanks of the input.  Industrial Power Systems of Denver, the big Kohler 
dealer locally, won't try to reconfigure the 25 KW generator without a 
single phase exciter.  They also say that we destroy the unit trying to run 
it with the imbalance.

It seems like a big generator for a home system, but we are talking stacked 
4024 inverters charging  24 L-16s.  Since the generator is at altitude, 
with the derating factor, it is a good fit.

There must be an old Kohler with a blown engine in a junk yard somewhere 
that we could scavenge an exciter off of.  But where?

Thanks again.

Drake

At 04:09 AM 04/06/2001 -0700, you wrote:
>Drake,
>
>I've never worked on Kohlers, but I wouldn't expect the exciter on a 3-ph
>alternator to be significantly different to the 1-ph version, except
>possibly its sensing voltage connection which might be phase to phase rather
>than phase to neutral. The rotor will still be d.c. whether the stator is
>arranged for 3-ph or 1-ph.
>
>Therefore it may be possible to reconnect the stator windings at the
>terminal rail for single phase operation and keep the same excitation
>circuit. Otherwise, why not just keep the generator 3-phase and connect
>single phase loads to one or more phases (phase to neutral, that is)? It can
>probably handle 5kW of imbalanced load - how big is the inverter system it
>is backing up? Can you put the charger load on a different phase?
>
>The machine sounds far too big for a home system whether it was cheap or
>not - it is going to be wasting a lot of fuel if it is only backing up a few
>kW. Can you get a big three-phase charger and load the generator up fully
>for a fast and efficient battery recharge?
>
>Hope this helps
>
>Charlie
>
>Charlie Robb
>Element Engineering
>
>77 Society Road
>South Queensferry
>Edinburgh
>EH30 9XP      UK
>
>Tel: 0131 331 5835
>Fax: 0131 331 5848
>Mobile: 07887 991866
>
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>-----Original Message-----
>From: Drake Chamberlin - Electrical Energy <solar at eagle-access.net>
>To: RE-wrenches at topica.com <RE-wrenches at topica.com>
>Date: 05 April 2001 21:55
>Subject: Kohler 25/30 kw 3 phase [RE-wrenches]
>
>
> >Hi Wrenches,
> >
> >We have a customer that has an old Kohler generator that he bought to back
> >up his solar system.  Unfortunately he didn't read the nameplate when he
> >bought it, and so did not learn that it is a 3 phase unit.
> >
> >Locally, we tried to have it changed over to single phase, which is
> >theoretically possible.  Unfortunately the single phase exciter for the
> >unit is no longer available.  Does anyone know where we might get a single
> >phase exciter for a:
> >
> >Kohler 1800 RPM generator.
> >
> >25KW continuous 30 KW standby
> >
> >Model #  30R82 91606 A5.28.29.42
> >
> >
> >
> >If it can't be converted, where might we advertise to sell it.  Doesn't
> >California have a generator shortage at present?
> >
> >Thanks for your help.
> >
> >
> >Drake
> >
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