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there is nothing wrong with you're unit at all, hope the previous information has helped. Should you not require you're system to execute the routine, you could disable it by changing the settings. This all depends on the type of batteries you are using as the power storage base.

The "E9" Is the indication that you're inverter/solar - PV is busy with the cycle of battery equalization. Equilization will occur on a delay cycle base which depends on the setting registers 37 interval period, 35 time duration, 36 time period.