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Growatt 5000ES tripping earth


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My Growatt 5000ES is tripping the earth leakage when AC power is on into the inverter and the output settings change from SBU to SUB. 

I have recently installed an E+N bond but that hasn't helped. 

Any thoughts on what it could be? 

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To elaborate. We have checked wiring, changed out the earth leakage, checked the E+N bond etc. Nothing seems to be solving it. And, the only thing tripping the earth is when AC is into the inverter and output changes from SBU to SUB or Utility. 

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