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single axix tracker // electrical losses acc. to strings

Stefan Albrecht

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I noticed that with the latest version 6.53 the electrical losses acc. to strings calculated for a single-axis tracker without backtracking are unexpected low! A simulation run with PVsyst version 6.39 calculated around 4-5% higher electrical losses for identical system settings.

Could you please clarify where these differences arise from?

Many thanks, Stefan

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A fraction of these 4-5 % might result from a change in the transposition model from Hay to Perez.

btw: how is it possible that an "identical simulation" delivers a non-constant result like "4-5 %" is...every run should deliver the same result.


I have seen older versions of PVsyst project higher losses compared to newer versions when running the same project.

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