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Communication error between the inverter and UP5000 Pylontech battery


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.I have 1 UP5000  Pylontech battery connected to a Growatt SPF 5000 inverter  The inverter sometimes go to alarm mode 20(BMS communication error ) for 2 minutes and reset  itself after two minutes and operate normal for days . This has now occurred twice. 

What could be the cause of this error?

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