Reference request – formula for the power supply of a solar module?

I'm trying to calculate how much electricity I would get from a solar panel on Mars. I have values ​​like solar radiation, area of ​​the solar module and efficiency of the solar module. I found a formula:
Power = area x efficiency x solar radiation x power ratio

However, I can't find a standard value for the power ratio anywhere, and I don't have a reliable source for this equation either, so I can't use it on paper.

Does anyone know a formula with which I can calculate the power delivered by a solar panel? If so, I would very much appreciate it and if there is a reliable source (such as a scientific paper) please also leave a name for it.