multiple grid-tie inverter interaction [RE-wrenches]

[Jeff Yago]

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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