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Grid tie inverters need a signal to echo in order to work. You would need to also use a regular inverter connected to the same cord that can handle the max output of both units or a small generator and the gti.
I did this once and posted about it online. Someone told me I was lucky the inverter did not burn up as I need to make sure the loads are heavier than the inverter rating so the gti handles part of the load.
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