@Palca at least for Chile you can see the following page where you can find a link to access for solar and wind information forecast based on the last 10 years.
https://www.naturaenergy.cl/article/blog-tecnico-solar-fotovoltaico

I hope could be usefull for you. Bye.

@greggie74 the solar panel will produce different power according to the year seasson and the sun condition, the Wp informed by companies is a referencial based on estandar condition.