PHOTOVOLTAIC & SOLAR ELECTRICITY DESIGN TOOLS





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How to get worlwide climate data for free from NASA in 3 steps ?


This tutorial helps you to get free set of meteorological data from NASA database.

Particularly you will learn how to get radiation values on equator-pointed tilted solar panels for different slopes.


Get radiation values on equator-pointed tilted solar panels for different tilts :


STEP 1 : First you have to connect to the NASA Surface meteorology and Solar Energy database for a particular location, here :

NASA Solar radiation and meteorological data


STEP 2 :  Enter the latitude and longitude of the location you want (example for Los Angeles : 34.05, -118.25).
You will see this page :

NASA Surface meteorology and Solar Energy

STEP 3 :  Select meteorological parameters for which you want to get monthly and annual values and press Submit (if you don't select a parameter you will get data for all the parameters including radiation, temperature, wind and precipitation data).

To get solar radiation data for horizontal or tilted solar panels you have to go to the sub-menu "Parameters for Tilted Solar Panels" and select "radiation on equator-pointed solar surfaces".

See here : :

radiation tilted solar panels

Then clic on the submit button.

RESULT : You will get a table with monthly radiation values for horizontal and various tilt, as shown in the picture below.

radiation tilted solar panels


The table shows monthly Averaged Radiation Incident On An Equator-Pointed Tilted Surface (kWh/m2/day):
   - Horizontal radiation values : "SSE HRZ"
   - radiation for various tilt : "Tilt for solar panel inclination angle of 0,19,34,49 and 90 degrees"
   - radiation for optimized angle values : "OPT"

To get the annual sum of radiation you have to take the annual average (kwh/m2/day) and multiply it by 365 (days).
For our example (Los Angeles) the annual horizontal global solar radiation is 1974.45 kWh/m2 per year (5.41 x 365).
You can copy and paste these values in an Excel datasheet.
Note that these values are for equator-pointed solar panels (orientation south for north hemisphere, orientation north for south hemisphere).


Get average monthly and annual temperature, wind, insolation and precipitation data anywhere on the globe :


Just follow the same methodology as above and select the relevant parameters :

   - Meteorology (Temperature) : Air temperature at 10 m
   - Meteorology (Other) : precipitation
   - Meteorology (Wind) : wind speed at 10 m for terrain similar to airports

You will get monthly and annual average values per day, just multiply per 365 to get the total amount per year.


Note that one degree of latitude represents a distance about 110 km on earth, same thing for the longitude, so the meteo dataset is given for a square of 12100 km2.
This is not so big for a first assessment of energy production, specially for area without mountains.

To get a complete list of solar radiation, check the list of solar radiation databases available on the web.




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