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I would like to know if there is a reason for not obtaining "electrical loss acc. to string" when using a Horizontal Tracking System and simulating as "According to Module Strings", regardless of the "fraction for electrical effect". With fixed structures, there is "electrical loss acc. to string" when simulating as "According to Module Strings", since shadows generate mismatch of electrical response of the modules in series and strings in parallel. I was expecting the same for Horizontal Tracking Systems (despite backtracking) since once there are shadows ("near shadings: irradiance loss" is not 0), the mismatch of electrical response of the modules would cause a loss.
Hello everyone, I've been recently introduced to the concept of backtracking. Based on what I understood, the trackers are tilted in reverse to solar tracking to avoid mutual shadings between PV rows when the solar elevation is low. In that case, I would expect that the near shadings losses would be 0 (assuming that there aren't any other surrounding obstacles in the scene such as trees). I simulated a project with bifacial PV modules in a N/S horizontal single axis tracker configuration. The elevation of each tracker row does slightly differ as indicated by the topography. However, currently, we cannot simulate such a scenario, thus we assume that all trackers are of the same elevation, orientation, and size. Considering this brief explanation, what could be the issue causing the near shadings looses to be non-zero when using backtracking? If interested, I can share additional details, Any feedback is welcome, Regards