Quick Answer
To achieve optimal performance from bifacial panels, position them at a slight angle, ideally between 5 and 20 degrees, to maximize front and back-side irradiance. The angle should be tailored to the local climate and panel type. Consider mounting the panels 2-3 inches above the ground to allow for easy cleaning and maintenance.
Optimal Angle and Orientation
The optimal angle for bifacial panels varies depending on the location and panel type. In general, a tilt angle between 5 and 20 degrees is recommended to balance front and back-side irradiance. For example, a study by the National Renewable Energy Laboratory (NREL) found that a tilt angle of 10 degrees offered the best performance for bifacial panels in a Colorado climate.
Ground Clearance and Maintenance
Maintaining a minimum ground clearance of 2-3 inches below the bottom of the panel is essential for easy cleaning and preventing damage. This clearance also allows for efficient snow removal and reduces the risk of ice accumulation on the back side of the panel. Regular cleaning and inspection should be performed to ensure optimal performance and extend the lifespan of the bifacial panels.
Panel Spacing and Array Design
When designing an array with bifacial panels, consider the optimal spacing between panels to minimize shading and maximize energy output. A general rule of thumb is to space panels at least 1-2 inches apart to prevent shading, although this may vary depending on the panel size and orientation. By optimizing the angle, ground clearance, and array design, bifacial panels can achieve up to 25% higher energy output compared to traditional monofacial panels.
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