Gen 1 in Idle Mode

Hi, I am using Wonderwatt to schedule Agile overnight charge and have had two days where I have woken to an empty battery and my inverter in yellow idle mode. Anyone have any idea why this might happen?
How do I get it back on line?
Thanks.

Idle means the inverter is still online (if it was offline you would not know the inverter status), just not charging or discharging the battery

athresuk
Thanks.
Yeah tried to force charge with the app and nothing happened, eventually went into system mode and reset from there and inverter came back into operation.

Have you checked the logs? This happened to me. WW tried to send charge instructions but there were repeated inverter timeouts (for unknown reasons). I'm not sure whether it was left in an idle state due to the WW commands not being completed, or due to flat battery (so no discharge) and very low solar at the time (42w when it came back online after restarting).

Watcher Was this without any inverter timeout messages? What's your inverter log say?