Dear Marcel,

You can first consider the Global Atlas for Renewable Energy (http://globalatlas.irena.org/).

But, if you want more detailed answers, can you be a little more specific?

- precise the region(s) of interest;

- precise if it is for scientific or commercial purpose;

- precise if you want data for free or for paid;

- precise the type(s) of irradiance data you want: global, direct, ..., three-year average of monthly irradiance or time series and the level of accuracy you are looking for.

- precise if you want to have gridded values (from satellite or Numerical Weather Models) or from in-situ pyranometric ground measurement.

Sincerely yours,

http://globalatlas.irena.org/

Dear Philippe,

Thanks for the website, I will check it. 

Currently I write a paper about ecophysiology of marine brown algae (kelps). I need data of the solar irradiance, principally from Chilean coast (Arica to Punta Arenas). I would like to find monthly data of the last three years (monthly average). Values of every 5 gridded will be good. 

Best regards, 

Marcel 

Srikanth, 

Thanks very much. Excelent website!. 

Best regards, 

Marcel 

http://solargis.info/

Hi Ricardo,

Thanks very much.

Best regards,

Marcel

I would second the recommendation of the  NASA Surface Meteorology and Solar Energy data-set. If includes a data-set of monthly average Insolation Incident On A Horizontal Surface for the entire planet in a 1-degree latitude by 1-degree longitude grid:

https://eosweb.larc.nasa.gov/sse/global/text/global_radiation

If you need (e.g.) hourly time-series data it is possible to produce estimates of this from the monthly averaged data using this solaR toolbox:

http://cran.r-project.org/web/packages/solaR/index.html

This is only approximate but means you can generate estimated time-series solar data for anywhere on the planet (although stochastic effects such as variations in the clearness index will not be well represented).

https://eosweb.larc.nasa.gov/sse/global/text/global_radiation

http://cran.r-project.org/web/packages/solaR/index.html

thanks Khalid!

best regards!