Why does my inverter enter into idle mode?

When the inverter state is checking, Normal or Standby state, when:
(1)battery capacity ≤ Min SOC(On-grid min SOC) and
(2)no PV and
(3)non-mandatory charging time period
If this state lasts for 30s, and the system will enters ldle status

If you want to let your inverter get rid of idle status, kindly set force charge your battery.

Also you can set the working mode as backup, then inverter will not enter into idle mode in the future.