Pvsyst POA is dependent on your weather file, location, and system design. There are a lot of questions one could ask, such as how well does your pvsyst model match actual site conditions, is there complex terrain for this site in question? If you are comparing measured to modeled and the results are way off, then perhaps you have an inaccurate weather file. Does GHI/DHI in your model match measured? If it doesnt, you shouldnt be expecting GlobInc to match measured. If your weather file is TMY, that is a P50 weather file.
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