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Horizon Data comparison
Davide Maglione posted a topic in Meteo dataHello forum users, i am doing some research on the various Horizon sources available. i have chosen some meteo data i have used for previous projects and i would like to do a series of analysis for each one of them using: 1 - SolarGIS Horizon profile 2 - Meteonorm Horizon (from PVsyst web sources) 3 - PVGIS Horizon (from PVsyst web sources) my goal is to: compare the "far shading losses" and the Horizon line drawings considering the different Horizon data so to have a general overview of the differences between the Horizon datasets; of course my research will also include the study of the manuals and theory behind the definition of the Horizon profile provided by each one of the three Meteo database. i would like to raise a couple of questions: how far has to be an obstacle to be actually considered in the far shadings? considering the high dependency of the horizon from the exact geographical coordinates, are there any suggestion on the horizon profile choice regarding big PV plants? has someone of you undergone some similar studies? have you found some interesting results? also, considering point 2, a question for the software developers: are you considering a possible software update that would allow the user to set different horizon profiles, perhaps linking a single profile to a single subfield? thank you very much in advance for your contribution! Davide
Ambient Temperature in Monthly Meteo Values
Hossam posted a topic in Meteo data
Hello, I am using PVSyst version 7.2, I have created a template meteo file that contains irradiance (w/m2) and ambient temperature (c) iwhich I import as a custom file into PVsyst with an appropriate conversion protocol file (MEF). The imported file contains hourly expected data for the whole year (8760 hours) with only 24 hours changed to actual values representing the actual temperature and irradiance values of the day I'm considering that come from the sensors at site. In some cases, values for the amb temperature and irradiance are 0, which should result in PVSyst simulating no energy production during that time interval, however when performing the simulation and extracting the output file I notice that the amb temp and irradiance values for intervals that were inputted as 0 have changed and become positive and therefore pvsyst has simulated energy production when there should not be. Has anybody faced similar problems or might know a way around this?