Quick Answer
To ensure optimal power output, bifacial solar panels on ground arrays should be mounted with a tilt angle between 20-30 degrees and an azimuth angle of 180-190 degrees to maximize morning and afternoon sunlight exposure. The panels should be spaced 300-400 mm apart to prevent shading. A south-facing orientation with a slight westerly tilt is ideal.
Mounting Height and Tilt Angle
Bifacial solar panels require careful consideration of mounting height and tilt angle to maximize power output. A minimum mounting height of 1.5 meters is recommended to prevent shading from surrounding objects. The optimal tilt angle for bifacial panels is between 20-30 degrees to ensure maximum exposure to both direct and reflected light. For ground arrays, a tilt angle of 25 degrees is often recommended, as it strikes a balance between morning and afternoon sunlight exposure.
Array Spacing and Shading
Proper array spacing is crucial to prevent shading and ensure maximum power output from bifacial panels. The American Society for Testing and Materials (ASTM) recommends a minimum spacing of 300 mm between panels. However, this spacing may need to be adjusted depending on the specific panel dimensions and manufacturer recommendations. As a general rule of thumb, a spacing of 300-400 mm is recommended to prevent shading and ensure optimal performance.
South-Facing Orientation and Azimuth Angle
For ground arrays, a south-facing orientation with a slight westerly tilt is ideal. This orientation allows the panels to maximize morning and afternoon sunlight exposure, which is essential for bifacial panels. The optimal azimuth angle for ground arrays is 180-190 degrees, which corresponds to a westerly orientation. This angle ensures that the panels receive maximum sunlight exposure during the morning and afternoon hours.
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