[RE-wrenches] Generators and Grid-tie Systems

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I have never been able to  get my generators to connect w/ a grid tie
inverter. The Kohler 20kW Isochronous generator electronic AVR doesn't nor
does the smaller Onan, Honda or even I had a customer w/  125kW & the SMA
wouldn't latch on despite the quality of power tiring to connect w/o a load.
I too was told by SMA to connect to the line side of the ATS, but that
doesn't mean that I haven't seen connection to the load side & have seen no
ill effects from this type of connection, just inverter not latching on.
  

-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Drake
Chamberlin
Sent: Wednesday, March 03, 2010 9:41 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Generators and Grid-tie Systems


The issue of what will or will not hurt an inverter, when connected to a
generator, does not seem to be resolved.  The fail safe method, of course,
is to connect to the line side of the transfer switch.  Other than that,
there are varied views.

There are systems in operation that intentionally AC couple generators to on
grid inverters.  A post on the List had linked to an article about such a
system, but so far I can't find the information. 

Has anyone else had problems with isolation relays?  This was a recommended
method that didn't work for me.  




Drake Chamberlin
Athens Electric
OH License 44810
CO License 3773
NABCEP TM  Certified PV Installer 
Office - 740-448-7328
Mobile - 740-856-9648 

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