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Global Solar Dataset for PV Prospecting Gwendalyn Bender
Vaisala, Solar Offering Manager for 3TIER Assessment Services
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Vaisala is Your Weather Expert!
We have been helping
industries manage the impact of
weather for nearly 80 years
Our weather analysis and
consulting services are based
on proven science
We help you understand the
true impact of weather on your
business, allowing you to
improve efficiency and
profitability
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Solar Experience
Developed the world’s first high resolution
solar irradiance dataset in 2009
Delivered over 500 resource assessment
projects on all 6 continents
Produced financial grade energy
assessments for more than 50
photovoltaic projects in countries including
the United States, Brazil, India and others
Supported over $5.5 billion dollars worth
of project financing for some of the largest
PV and CSP plants in the world
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Observations
Equipment Design
Uncertainty
Environment
Derates and Losses
Net Energy
Solar Energy Assessment Process
Satellite Data
What Data is Available
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Available IRENA Dataset
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What Are We Looking For?
GHI – Global Horizontal Irradiance
DNI – Direct Normal Irradiance
DIF – Diffuse Irradiance
Global horizontal irradiance is the total amount of shortwave radiation received from
above by a horizontal surface. This value is of particular interest to photovoltaic
installations and includes both direct radiation and diffuse radiation.
Direct radiation is solar radiation that comes from the direction of the solar disk in the sky.
This value is important for concentrating solar power installations and tracking photovoltaic
installations.
Diffuse radiation is solar radiation that has been scattered by molecules and particles
in the atmosphere and comes equally from all directions.
On a clear day, most of the solar radiation received by a horizontal
surface will be direct radiation, while on a cloudy day most will be diffuse
radiation.
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Available IRENA Dataset 10 year annual means of GHI
Temporal Coverage
Region Covered Satellites Used Dates
Western
Hemisphere
GOES 8-13 January 1997 -
December 2010
South Asia and
Middle East
Meteosat 5 and 7 January 1999 –
December 2010
East Asia and
Oceania
GMS 5, GOES 9,
MTSAT 1-2,
Himawari8
December 1998 –
December 2010
Europe and Africa Meteosat 7, Meteosat
9-10
July 1998 –
December 2010
Spatial Coverage
Data is available between 60 degrees North
and 58 degrees South.
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Satellite Derived Assessments IMS Daily
Northern
Hemisphere
Snow and Ice
Analysis
Shuttle Radar
Topography
Mission
(SRTM)
Perez SUNY
methodology
MODIS
Atmosphere
Daily Global
Product
Proprietary
3TIER Services
cloud algorithm
5 Geostationary
Satellites
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Satellite Derived Assessments
Considerations
Greater uncertainty than
observations (over the same time
period)
Known issues with satellite
modeling include areas of high
albedo, turbidity modeling, areas
of snow cover and satellite
degradation
Benefits
Consistent global approach.
Interannual variability captured with
multiple years of data
Satellite derived data is known to be
the most accurate source of irradiance
information beyond 25 km of a well-
maintained ground station (Zelenka et
al., 1999)
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Independent Validation of Accuracy
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Percent bias for GHI against 100+ independent ground stations for an overlapping period of time
How to Use the Data
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Comparing Locations in IRENA
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Comparing Locations in IRENA
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Comparing Locations in IRENA
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Comparing Locations in IRENA
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Next Steps
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Get to Know the Variability at Your Site
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DNI
Variability in
India by
month and
year.
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2015 Solar Resource Variability
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Percentage of normal
%-10% 10%
2015 Annual Average GHI Departure from Normal
Q1
Q3 Q4
Q2
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Maps are Step 1. Time series are Step 2.
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![arXiv:1901.07525v1 [cs.SY] 22 Jan 2019 · typically the global horizontal irradiance (GHI) normalized with a clear-sky model (see [16, 17] for a comprehensive review). Global radiation](https://img.pdfslide.us/doc/110x75/605d916875312952b402d3d0/arxiv190107525v1-cssy-22-jan-2019-typically-the-global-horizontal-irradiance.jpg)
![CSP Sites Suitability Analysis in the Eastern Region of ... · 2010) data for global horizontal and direct normal irradiance for the whole Mediterranean region [22]. The international](https://img.pdfslide.us/doc/110x75/5f5eb5176c33843ce4069db2/csp-sites-suitability-analysis-in-the-eastern-region-of-2010-data-for-global.jpg)
