3-phase generator [RE-wrenches]

[Bob Ellison]

If the generator is a 12 wire reconnectable it can be rewired to single
phase but here is the problem, (one of many) you generally loose 40% of the
output when you reconfigure it. Take 40% off a 5 K generator and there is
not much left!
I agree with Christopher, find and old motor guy for the best advice.

Bob

-----Original Message-----
From: Christopher Freitas --- OutBack Power
[mailto:cfreitas at outbackpower.com] 
Sent: Tuesday, June 13, 2006 1:38 PM
To: RE-wrenches at topica.com
Subject: RE: 3-phase generator [RE-wrenches]


Many three phase generators can be configured for single or three phase
output by reconnecting the windings of the generator.  I doubt that this
would be something covered in the manual though.  You might check around for
a motor rewinder guy (the older the better from my experience) and see what
he says. You probably will need to put in a bigger single pole breaker (on
some they just parallel the three poles together which is 
marginal).   

There is no three phase to single phase balancing transformer solution that
I am aware of.  

If he is going to run large a large 3 phase load (such as a pump) along with
the single inverter on one phase - then its OK.  

If the only load is the inverter - be careful to limit the draw to about
1/3 of the generator's rating or you can overload a winding (which there is
no temperature sensing to protect).  

Christopher


Nicholas Ponzio wrote:
> 
> We've got a possible off-grid client that already owns a 3-phase 
> generator (5kVA Onan). He only needs a single inverter. Any clean way 
> to do this?
> 3-to-1 balancing x-former? If not, how bad is it for the generator to 
> only use a single leg?
> 
> Thanks for any input.
> -Nik

Christopher Freitas
OutBack Power Systems, Inc.
cfreitas @ outbackpower.com
www.outbackpower.com
Arlington WA USA
Tel 360 435 6030  


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