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One possible (and cumbersome) workaround to move a surface, may be to define multiple Shading:Building:Detailed in the same location, but with different orientation. (I don't know, if e+ has a problem with overlapping shading surfaces. If yes, this won't work). With EMS you can override their Transparency Schedule. You can set the surfaces, that are not facing the sun at the moment fully transparent, and set the one surface to fully opaque, that is facing the sun. Again, with an EMS sensor you can read the solar irrad. on the opaque surface, and calculate the generated electricity within the EMS program, with some simple model.

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