does anyone know 'exactly' what this setting does

at a guess it is some time syncro moment
but it is always around this nearly 4:15 am - and it causes me problems in charging from the grid, the inverter will sometimes start charging the batteries at this moment, and at other times it has actually shut down an active charging session
what is its exact function?
and also, does anyone know when the timers are set to charge, are these times kept on the cloud and the cloud fires the instruction at the very moment - or are the times kept on the inverter ?