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Transposition Factor


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I am running parametric simulations with two different Meteo files for the same location and all the other system design/loss parameters remain the same. Both the .MET files have same monthly GlobHor and DiffHor values. However, in reviewing the loss diagram I see two different values for the transposition factor in the loss diagram which essentially should stay the same when GHI and DHI are same. Can you please explain the source for the difference in transposition factor?

Note, that the only other difference I found with two MET files was the difference in time shift (Average time shift on clear days -- -10 minutes vs - 42 minutes).



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