The Glazing should be south facing to maximize the SunCatcher’s winter solar gain.  Solar Gain is the incoming sun rays that enter the SunCatcher, used for photosynthesis by the plants and to heat the structure. The most effective angle of the SunCatcher’s glazing to maximize solar gain for locations in the northern hemisphere is 60° up from horizontal.

The angle of the glazing is designed to maximize available solar energy during the coldest period of the year. The angle of the glazed south-facing surface is used to maximize winter incident solar radiation (insolation) into the structure for regions lying within the middle latitudes during the three months preceding and the three months following winter solstice. Conversely, this angle minimizes insolation within the structure during summer months.

The SunCatcher interior has waterproof light color reflective surfaces, which reflect incoming solar radiation in the winter months back toward the plant growing space and thermal mass. These two features increase the amount of natural light reaching the plants compared to the amount of light that same footprint outside of the structure would normally receive during winter months.

Winter sun rays diagram with sun being captured and for photosynthesis and heat.

Summer sun rays diagram with sunlight being reflected.