When you sell solar energy, is there an automatic function?

It seems that we are able to skip the 50kW transforner and will have a dirext connection with PEA soon.

I think we also should be able to sell energy to PEA, max 5kW.

Will that work so after my batteries are full, overflow of energy can be sold to PEA.

What function will take care of that?

And also take care of the load I have.

Panels filling batteries, taking care of the load and after that, selling energy to PEA.

Is it working like that? If so, where is the function, in inverter?

Max 5kw, if I can sell 5kW in 3 h, will it be 33 baht?

In a month, perhaps it can be 1000-1500 baht, not so big money.

Now I am off grid but batteries are not enough so it can be good to get some extra power from PEA.

Is there a fixed cost or are there only kWh price?