Thanks for that link Carsten. I am trying to get my head around it. Granted, a cube is indeed a very practical envelope for enclosing volume but I don't think its ideal when it comes to Solar Houses.
I notice that GizMag have an article of solar houses, Solar Decathlon 2013: Five solar houses to watch
http://www.gizmag.com/solar-decathlon-2013/28275/
I've scanned through the 76 images and was a little disappointed as no planning details were shown only pretty renders 😒
One thing I did notice was that a lot of the designs showed PV panels propped on roofs and it looked to me that Sun orientation considerations where not being taken into account for the intended locations of these houses.
Its a simple well know fact that PV and SWH panels perform best when they are orientated a right angles (on average) to the mid day sun.