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RE: ganging up cheap generators
Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>
I have two generators that I have put together. One is single phase
utilizing a small Kubota diesel off Ebay and a dual belt driven Gen head
from Harbor Freight at ~10KVA. Easy to build.
The second one is a work in progress and is comprised of a Isuzu 240C
Industrial diesel prime mover and a Stanford - Newage three phase direct
drive gen head that required machining the flywheel, which is coupled
directly to a flex plate and thus the gen head. Again Ebay. Out of two
engines I got one good one :-^)
The costs are similar, the effort is much greater.
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Tuesday, January 09, 2007 11:08 PM
Subject: Re: ganging up cheap generators
Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>
At 05:56 PM 1/9/2007, Tesla list wrote:
>Original poster: <davep@xxxxxxxx>
> > Actually, with a suitable zigzag transformer, apparently
> > synchronization is no worse than just paralleling them.
> > Frequency/phase takes care of itself (the generator that wants to run a
> > bit fast takes more load, slowing it down).
> Which means it takes more of the load, so there is less than 3X
> power available.
> Also the underspeed.voltage units will tend to _absorb_
> power, robbing the external load.
Well, that's why it's less optimum than a real 3 phase
generator. But, finding a brand new 3 phase generator for $750 might
be a bit of a challenge.
> > There IS an issue when throwing the switch to connect them.
> > Amplitude is a matter of regulators and throttles.
> An current sruging baack and forth as the throttles
> run the units up and down. And the fact the voltage
> regulation is less important than frequency regulation
> when paralleling AC sources. And the fact that 'identical'
> regulators AND governors on three 'identical' units
> won't be. cf any text book on power system stability.
I didn't say it would be easy <grin>...