Quick Answer
You can retrofit a fixed mount solar array to a tracker, but it requires significant design and engineering effort and often involves removing the existing racking system.
Design Considerations for Tracker Retrofit
When retrofitting a fixed mount solar array to a tracker, the first step is to assess the existing racking system’s load-carrying capacity. Typically, trackers require additional structural support to handle the increased forces exerted by the solar panels as they move to follow the sun. A typical fixed mount system can support up to 20-25 psf (pounds per square foot) of loads, whereas trackers may require up to 30-40 psf to compensate for the oscillating forces.
Mechanical and Electrical Upgrades Required
To successfully retrofit a tracker, the existing racking system, electrical connections, and wiring need to be upgraded to accommodate the increased loads and movements. This may involve replacing the existing racking components with heavier-duty materials, such as steel or aluminum, or installing reinforced crossbeams to support the tracker’s motion. Additionally, the electrical connections and wiring may need to be rearranged to accommodate the tracker’s moving components.
Cost and Feasibility Analysis
A critical aspect of any tracker retrofit is a thorough cost and feasibility analysis. This involves evaluating the existing system’s condition, the required upgrades, and the potential benefits of the tracker system. Typically, a tracker retrofit can offer a 10-20% increase in energy production, depending on the system’s original design and the local solar irradiance levels. However, the costs of upgrading the system, including the tracker hardware, electrical components, and labor, can be substantial, often ranging from $3 to $10 per watt, which may offset the initial benefits of the tracker system.
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