Dears, I would like to open a discussion about a very interesting point in PV system simulation by the PVsyst program.
I attached here two graphs of a different PV system for the same Meteo data (i mean for the same project site). The simulation results showed that.
1- The daily system output energy (Graph1) dropped down two times down to zero value into the grid during July and March months, why?
2- Also, Why the output energy from the PV system during the summer season was less than the winter season compared with the daily output energy Graph 2?
Greetings
Ahmed Fawzy Eid
1. Either the meteo data had some weird values during those days that affected one simulation but not the other, OR the inverter(s) were overloaded and/or set to be offline for some reason. You need to look into the details for those "zero" days.
2. The solar resource is not necessarily higher _every day_ in summer compared to spring or winter. All depends on climate (clouds, aerosols), daily weather features (thunderstorms...) and tilt angle.
2. Moreover Temperature is normally higher in summer, hence the efficiency decreases...
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