Heat Gain Simulation reading No solar input

Hi

I'm running a heat gain simulation on a room that is essentially a greenhouse.

The glass roof etc has all been set up as has the weather info.

The results output of the simulation reads that the temperature within the room stays constant all day and that there is no 'Solar input'.

Obviously the roof is made of glass and therefore this can not be the case.

What changes need to be made to my model/input data in order for the simulation to account for the solar gains.

Kind Regards

David