BYD "battery mode: startup" every night?

[rgormley]

inverter: Fronius Gen24 PLUS 8KW
panels: 8.8kw bifacials
batts: BYD 11.3 HVM

Every night when running on batteries when i look back at the graphs and stats i always see a green dot on the battery discharge curve that says "battery mode: startup"
any idea what this is?

seems to be around 1-2am
makes not difference if the batts have run down to 5% or 50% (or whatever overnight discharge) the green dot is there with the message.

see attached photo

 

[rgormley]

I got an answer from whirlpool.. so the mystery is solved

The inverter does a insulation resistance test every 24 hours. The startup will be due to the inverter being disabled/enabled during the test, iirc it takes less than a minute to perform.