Paul, please refer to the new attachment in my original post floor for the SMA results.
And one more article supporting my opinion was found: “DC / AC Ratio Optimization” by Gordon Woodcock on SAM Virtual Conference 2013. It’s an article on NREL’s website:
sam.nrel.gov/sites/default/files/content/virtual_conf_july_2013/07-sam-virtual-conference-2013-woodcock.pdf
And actually it also has the presentation on Youtube:
www.youtube.com/watch?v=nvN6s1EpdS8
In this slides, page 4 shows the daily performance of different DC/AC ratio on an inverter.
Although the DC size is increased from 1.16 to 1.33, the AC gain on the diagram is still limited.
I also include this screenshot in the attachments please check.
Is it my illusion that the PVWatts result for Test2 is too high? Or it is supposed to be like this? I’m confused on this for long time, please help me out Paul. Again, Thank you so much!
Best,
Jiakai