Mount types

Dear Annelore,
Thank you for the clarification. As the distance between the back of the module and the roof surface decreases, the effect of the back material also decreases. For your application, you might consider using either the glass/cell/glass close roof mount or the glass/cell/polymer insulated back option.
Here are some results from a parametric analysis on the mounting structure options that show how they affect the system's performance ratio:

Best regards,

Paul.