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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: image description

The hourly PV output for one day is: image description