Solax X1-VAST questions

Hello, I have an application in the UK where there is a weak grid supply (4kW max).

1) Can the X1-VAST inverter be set to respect the maximum import or export power limit of 4kW in total, even if the load is greater?

2) Can the X1-VAST inverter be set to export power from the battery to the grid, based on a given schedule or by API command, for example during the evening when there is no solar input?

3) Is there a document containing MODBUS or similar command structure?

Thank you!