multiple grid-tie inverter interaction [RE-wrenches]

[daryl_solar at yahoo.com]

HI Jeff
I have run several inverters on the same sub panel, on the same breaker even, on the same Outback autotransformer, even in AC coupled mode. I have not had a problem.   


--- On Tue, 6/10/08, Jeff Yago <jryago at netscape.com> wrote:

> From: Jeff Yago <jryago at netscape.com>
> Subject: RE: multiple grid-tie inverter interaction [RE-wrenches]
> To: RE-wrenches at topica.com
> Date: Tuesday, June 10, 2008, 7:34 AM
> I know during grid-tie inverter design and testing one of
> the tests is anti-islanding (when multiple inverters seeing
> the output of another inverter on the same grid connection
> and staying on line after a power outage thinking the grid
> is still up) and they are designed not to do that. 
> However, has anyone run into a multiple grid-tie inverter
> system where side-by-side inverters connected to the same
> output breaker panel were "affected" by its
> neighbor?  Maybe the output from one inverter caused enough
> alternation of the incoming grid sinewave, frequency shift,
> or voltage that forced another inverter to drop off line
> because it thought the grid was out of design limits.   
> 
> DO any inverter manufacturers indicate there is a limit to
> how many of their inverters can output to the same
> sub-panel, or share the same wire feed?  How about limits
> on how close together (other than heat and ventilation
> issues).  How about mixing inverter models and brands, for
> example expanding an existing system and older inverter
> model or brand no longer available.  I am guessing if this
> is possible, it would be more likely in a system with a
> very long "shared" wire run back to the meter
> base.   Any testing or experience on this?
> 
> Thanks,
> Jeff Yago
> 
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