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Auto transformer tripping

I have an auto transformer ATR 32A connected to a 5KVA inverter, my problem is that sometimes the trafo breaker trips when the inverter switch from battery to line. I’m concerned about the ground relay which is not connected because my inverter is not a Quattro but a MMP and i did not see the technical reason because the solar panel fed from the trafo is a split phase 240/120 volt panel with the neutral grounded. Also the trip occurs sporadically. Should I connect the trafo ground relay to the dry contact on my inverter?

Autotransformer
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