I would check with your local Meteorological Department, as these should be collected at local Met stations. Choose an official site that collects this close to your site. It will be affected by the Latitude and longitude and cloud cover. 

Hi

It depends on the location and type of the data required for your study but you can find free data files for some location available here https://energyplus.net/weather 

best wishes 

Hi,

You can try here: http://www.soda-pro.com/web-services/radiation/cams-radiation-service

Hi, you can obtain historical data of solar generation of the Spanish Electric Network at https://demanda.ree.es/movil/peninsula/demanda/tablas/2017-02-07/2

I hope that it can help you. 

Can I get radiation as well as PV power data of India? Kindly provide me any link if it is possible?

Dear Harendra Kumar Yadav,

Perhaps you can contact the authors of this paper: http://dx.doi.org/10.1016/j.egyr.2015.10.001 or that one

http://dx.doi.org/10.1016/j.energy.2013.03.075 and then compare the modeled PV systems (based on soda-pro data) and the real ones.

@ Jakub Jurasz , Thanku you sir for your valuable suggestion.

there you can find it

http://solarelectricityhandbook.com/solar-irradiance.html

The  22 years  average solar radiation of any place in the world is available with NASA METROLOGICAL website.  The longitude, latitude and MSL(main sea level) of the place is to be given as INPUT data.  From January to to December, day-wise.hourly  synthetic data is available.

Many Thanks for All

 Dear Dr Kamalapur

These data from NASA METROLOGICAL website are free ?

Dear Jakub Jurasz 

Thanks for the links

SoDa really provide hourly solar radiation (beam, Direct and Diffuse) for Cameroon. I found also weather data, but there are some contradiction with the month of Feb and September. 

Ekoe Aloys

It has been a while since you made this post, but I wanted to make sure that you were aware of the FREE solar radiation data offered by Solcast, for researchers and students.

https://articles.solcast.com.au/solar-data-api/free-access-to-solar-irradiance-data-for-non-commercial-research-use

https://www.meteoblue.com/en/weather/archive/export/chennai_india_1264527?daterange=2019-01-31+to+2019-02-01¶ms=¶ms%5B%5D=11%3B2+m+above+gnd¶ms%5B%5D=660%3Bsfc¶ms%5B%5D=32%3B10+m+above+gnd%3B31%3B10+m+above+gnd&utc_offset=5.5&aggregation=hourly&temperatureunit=CELSIUS&windspeedunit=KILOMETER_PER_HOUR

We've already had 155 researchers and students from around the world register for FREE Solcast solar radiation data (Normal, Diffuse, Global): https://solcast.com.au/solar-data-api/free-solar-radiation-historical-and-forecasting-data-for-researchers/

All depends on your area of interest. You can start with

http://re.jrc.ec.europa.eu/pvg_tools/en/tools.html

We have used PVWatts Calculator (https://pvwatts.nrel.gov/).

Thanks very much Nick Engerer very nice and pleasant site to get data. Thanks

Dear Researchers,

   Please go through the following link, where data access window is available.

Furnish the details of latitude, longitude and the  duration of requirement(date and month).

https://power.larc.nasa.gov/data-access-viewer/

  Hope this may be useful.

Dear Ekoe Aloys,

It depends mainly on the location of interest. The data from NASA meteorological website are free (https://data.nasa.gov/Earth-Science/Prediction-Of-Worldwide-Energy-Resources-POWER-/wn3p-qsan). Can also try this one (https://re.jrc.ec.europa.eu/pvg_tools/en/tools.html). Hope this helps!!

Please see the following website https://www.nrcan.gc.ca/energy/energy-sources-distribution/renewables/solar-photovoltaic-energy/solar-resource-data-available-canada/14390

see if this helpful

https://www.nrel.gov/gis/solar.html

You can try https://power.larc.nasa.gov/data-access-viewer/ for free. FYI, that website provides daily solar radiation data in MJ/m2/day. You also should visit www.toolkit.solcast.com.au...

http://www.soda-pro.com

it may be provided by your energy ministry of your country or the target country. check their resources

Photovoltaic Geographical Information System

https://ec.europa.eu/jrc/en/pvgis

I think it is too late to provide this link. However, if someone like me needs it any time soon this link provides organized hourly/monthly data based on location.

https://globalsolaratlas.info/map

https://nsrdb.nrel.gov/data-sets/archives.html

https://re.jrc.ec.europa.eu/pvg_tools/en/#MR

You can use this site please!

Most of the recent additions are just repeats of older ones...

A general answer (including both free and commercial sources, as well as both modeled and measured data) can be found in Chapter 6 of Book Best Practices Handbook for the Collection and Use of Solar ...

There is some free data available (Solar Anywhere Public License) for sites scattered across the globe at Clean Power Research: https://www.solaranywhere.com/2021/pv-innovation-boost-new-solaranywhere-public-no-cost-solar-data-select-locations/

Thanks, Marc, I was not aware of that new feature--very helpful!

Thanks Wondimu Barana

I need it for project works

NSRDB (nrel.gov)

Dear Ekoe Aloys . Each region has its own solar radiation data . Just contact the meteorological center in the region and they will provide you with the needed data.

You can access Oahu's data files by clicking on the following link.

https://midcdmz.nrel.gov/apps/daily.pl?site=OAHURS1M&start=20100316&yr=2011&mo=11&dy=01