Landscape orientation (string)
When a string of SunPower Performance panels in landscape
orientation encounters linear shading across the tracker row,
the voltage of the panel remains unchanged (figure 9). This
allows inverters to continue operating in their optimal
window and maintain peak efficiency.
With the bypass diode activated in the conventional panel,
the string operates in a similar fashion, but power is further
limited by the electrical configuration of the panel.
Figure 9: The SunPower Performance panel maintains its advantage in shade when consistent linear shadows (i.e. row-to-row shading)
impact the entire tracker row in landscape orientation.
Portrait orientation (string)
When a string of SunPower Performance panels is in portrait
orientation with linear shading across the tracker row, only
1/3 of each panel is bypassed (figure 10). String power is
reduced, but the advantage of the diode configuration
allows production to continue. In the case of the
conventional panel, the string will continue to operate at
50% power.
Figure 10: The SunPower Performance panel produces more energy than conventional panels when a consistent linear shadow is cast
across the entire tracker row in portrait orientation.
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