IgLoo Posted November 6, 2022 Share Posted November 6, 2022 Hi I generated report and hourly data file. When I'm calculating monthly avg PR from hourly data file it is different from monthly value in report. I excluded hours without sun, and still there is difference Link to comment Share on other sites More sharing options...
IgLoo Posted November 6, 2022 Author Share Posted November 6, 2022 Link to comment Share on other sites More sharing options...
Michele Oliosi Posted November 7, 2022 Share Posted November 7, 2022 Can you explain your calculation for the monthly average PR ? Link to comment Share on other sites More sharing options...
IgLoo Posted November 7, 2022 Author Share Posted November 7, 2022 Hi I'm just taking hourly data for PR ratio of the specific month and using "average" formula Link to comment Share on other sites More sharing options...
Michele Oliosi Posted November 7, 2022 Share Posted November 7, 2022 Ok then that is likely the reason. The PR is basically a ratio between yield and incident irradiance. These values are different at every hour. Now, you should remember that the ratio of averages is not the average of the ratios. The correct way would be to sum the yield (E_Grid) and average the global incident irradiance (GlobInc) separately and then recalculate the PR based on the two resulting values. Link to comment Share on other sites More sharing options...
IgLoo Posted November 7, 2022 Author Share Posted November 7, 2022 thx Will try that Link to comment Share on other sites More sharing options...
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