What is maximum kW you can export to grid?

Hi I'm new to this and would greatly appreciate your response.
I have set up my batteries to export twice a day to the grid to take use of Octopus Flux tariff.
When I view my dashboard board at the times I have set I see the solar panels are exporting to the grid only and not to the batteries. The batteries are idle. So the batteries are not exporting to the grid even whilst they are fully charged
Is this because it is a sunny day and I can't export my solar energy and my batteries Energy.?
Is there a cap on what you can export,?
I have 2x 9.5 Kwh batteries
5.6 Inverter
14x 400w panels.
Help!!!!!! Please
Steven

you must have a hybrid inverter not an ac3.
you can only export to the maximun of the inverter if you have a hybrid so in your case 5.6.
with an ac3 you can export all the solar and the total ac3 output (3.14kwh) assuming you do not have a g99 / g100 limit to export from your DNO

5kW AC output power on that device?

Obvs some can go to the battery (DC to DC!) if not full and some to the grid.

Can be a useful "low and slow" approach to avoid clipping?

Bolts
Check inverter settings timed discharge