mono vs poly real life testing

3 tons wrote:
What he doesn’t attempt to make clear is, why do two different types of panels (differing in substrates and size) that are rated at the same wattage (i.e. Power) might produce results that are different than their manufacturer’s 100w ratings??

3 tons

The 100 watt rating of the panels is "Ideal conditions"
The roughly half that he observed is "Real Conditions".

This is well known.