[RE-wrenches] Max AC coupling backfeed?

[Tump]

All, I am wondering what the max AC Coupled back feed into an OBGTVX 3648 might be. I have installed a 4.9 STC array into a SMA TL5k inverter and the customer presently has an single OB GTVX with a T240 into a Eback up load panel. I would like to know if there are any limitations in this type of configuration using an AC coupling situation to operate during a grid failure.
Thoughts please.

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