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Autotransformer ground relay wiring

I have a non-Victron inverter supplying 240 non-split phase to the AT. There is polarity indicated on the ground relay input (+ & -), so it appears to take more than a jumper. What input is required to close the circuit between output Neutral & Ground?

Autotransformer
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I have same question. I want to use 2 growatt spf5000es transformers in parallel single phase 240VAC, using a victron 100amp autotransformer to get 120VAC legs, but when switching to shore power, autotransformer is not needed, I don't know how to wire this.

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