How is the Generator Produced DC Electric Power calculated?

The following are the output variables for a particular PV surface.

May I ask how is the Generator Produced DC Electric Power [W] calculated?

It seems it is not equal to
Surface Outside Face Incident Solar Radiation Rate per Area [W/m2]
x Surface Area [m2]
x Generator PV Array Efficiency

The PV generator is specified in Honeybee as the following:

The hourly PV output for one day is (Excel file attached):

PV output.xlsx (55.6 KB)