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Hi all, SolarGis uses the Perez transposition method to pass the irradiance from GHI to Glob.Inc (POA). Does PVsyst have any advantage in terms of accuracy? I mean: is 'Pérez transposition method' applied first and then the 3D model, shadows and horizon are applied or does the model itself also use the information from the geometry where the plant is located? Glob.Inc. (POA) output of PVsyst is more accurate than GTI (POA) SolarGis?

Thanks for your help @Michele Oliosi

Hello, I have a doubt regarding how can influence the TMY weather data from two different sources (meteonorm & solargis) on the gain (GHI/POA), I think this must be only geometrical matter. I have run the same model with both databases: v.7.2.16 TMY MN yields a PR of 79.2% and the ratio GHI/POA = 1.29 v.7.2.16 TMY SGis yields a PR of 78.5% and the ratio GHI/POA = 1.27 also, as a reference I have the original version: v.6.53 TMY MN yields a PR of 78.2% and the ratio GHI/POA = 1.29.

Thanks for your support!

Good afternoon to all, this is my first post on this forum. Last week I had a problem simulating a contractual year custom meteo file (from 10 of Apr.19 to 10 of Apr20), whose weather values cover 13 calendar months, although it is actually 366 calendar days. When I ran the model a few weeks ago (in version 7.1.8) I had no problem, but when I ran it last week in version 7.2.2 the 13th output (corresponding to the last 10 days of the year to be simulated) showed a yearly subtotal instead of the monthly subtotal. At first I thought it could be a configuration issue, but I was checking all settings and i didn't found anything... then we simulated again in an older version (v.7.1.8) and we got the expected result. What could be the cause of this problem? Thanks in advance :)