Please clarify if I understand this about the ultra

If you have the ultra and the smart panel 2, it will transfer over to battery power and the items in that smart panel when the power is lost.

What I’m curious about is what the ultra is doing when there is grid power. I assume it charges the battery but how do you, or CAN you, utilize that power over grid to reduce the grid usage?

Also, if you have solar plugged into the ultra AND you have grid power, does it prioritize battery/solar power for the items ONLY in the smart panel or all items, etc.

I know I’m in the weeds here but I’m trying to educate myself so I know ALL the benefits and how it works in multiple scenarios. Thank you.