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Solar Explorer TMDSSOLARCEXPKIT

TMDSOLARCEPKIT: Solar Explorer low voltage.
We need to create an grid-tied AC network from microinverters.
The Solar Explorer Kit firmware was configured for grid-tied configuration (Build 3 in your demo). The output of the kit (Vac1 and Vac2) are connected to the resistive load. The same load is connected to the output of the step-down auto transformer which was set to 15V output voltage. The autotransformer was connected to the main voltage (240V via an oscillating 1:1 transformer). When a single inverter is connected it works fine. When we tried to connect the second kit to the same load and start the inverter the autotransformer generated a very sharp audible noise and the whole system crashed. due to very high switching noise. Could you please advise what is the correct configuration for multiple inverters. Any other leads would be appreciated.

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