Hi Suphak,
1. You can find a description of each input by clicking the "i" button next to the input's label:
2. Your interpretation of the values looks correct to me.
3. The P50 value is usually close to the TMY value. You are correct that they are different because they are based on different assumptions and calculations.
4. Yes, the new Uncertainty simulations replace the old P50/P90 ones for the Detailed PV and PVWatts models. The new feature shows you the year that represents the PXX value, so you can run a "regular" simulation by choosing the weather file for that year on the Location and Resource page and clicking
Simulate. For example, this graph shows that the 1999 weather file generates the P90 annual energy value, so you could run a simulation with the 1999 weather file to see the daily profiles and other results.
5. No. The uncertainty analysis is based on annual energy.
6. Yes. You can right-click graphs to export either an image of the graph or the data it displays.
7. The graphs show the interannual variability of annual energy caused by variability in the solar resource data. You would have to analyze the data in the weather files themselves to determine other values of variability.
Best regards,
Paul.