Flat roof and solar

[LSB]

Our DIY new build has a flat roof (12 degrees).  This is huge at 24m * 9m and will be metal.  It's a barn conversion so we are limited to this design.

I'm being told that you can't have in-roof solar on flat roofs, is that really the case or have I just not found the right supplier.

Our planning does not allow us to go any higher than the top roof height, but also says we must have solar and we don't have space for ground mounted.

The roof is pointing south with nothing stopping the sun so is an idea location.

I don't want to cover the whole roof due to the size.

 

Thanks