SW sync problems [RE-wrenches]

[Drake]

I have a pair of stacked SW inverters (not plus) in a back up system that sync with the grid for several days, and then start switching back and forth between the grid and the inverters. 

There is little possibility that the grid voltage is going above 132V or below 108V.  The new SWs don't seem to have a frequency window adjustment.  Has anyone seen this problem?  Does anyone have a solution?

Thanks,

Drake 



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