FirstGreen Consulting is a company working in the area of renewable energy, energy efficiency and climate change The team has extensive experience in handling the Renewable, and energy efficiency projects FirstGreen is providing energy sector consultancy in the sustainable energy, with expertise ranging from carbon advisory to technical consulting, to project implementation and project management.

1. Solar resource Assessment
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2. Solar Radiation Components
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3. Average GHI and DNI In India
Average GHI in India Average DNI in India
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4. Land based measurement
 Thermal Pyranometers – These are
also known as solarimeters and
typically consist of a black metal plate
absorber surface below two
hemispherical glass domes in a white
metal housing.
 Solar irradiance warms up the metal
plate in proportion to its intensity
 Silicon Sensors – These are cheaper
than pyranometers and consist of a
PV cell, often using crystalline silicon.
 The current delivered is proportional
to the irradiance.
 Well maintained land-based sensors
can measure the solar resource with
a relative accuracy of 3-5%.
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5. Land Based Measurement
On‐site monitoring provides significant value to assessing a
project’s potential, translating to higher confidence in
energy estimates.
– Accurate Representation of the Project Site
– Customizable for Various Technologies (e.g., PV or CSP)
and Various Users
– Flexible Equipment Options and Costs
– Small Environmental Footprint
– Straight‐Forward Installation & Operation
– Self‐Contained Communications and Power Supply
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6. On Site measurement
 Maintenance
– Regular Schedule
– Clean and Level Instrumentation
– Verify Site Security and Overall
Conditions
 Data Validation and Quality Control
– Regular System and Data Inspection
– Comparison with Reference Data
– Extreme or Suspect Values
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7. Data Summaries
 Site Description
 Solar Statistics
 Meteorological Statistics
 Monthly and Diurnal Trends
 O&M Summary
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8. Investment grade solar resource assessment
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9. Off site data
 Site Location and Exposure
 Proximity to Project Site
 Reference Station
 Period of Record
 Data Trends
 Data Recovery Rate
 Site Maintenance
 Instrument Calibration
 Correlation Between Sites
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10. Adjusting to the long term
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11. Data uncertainty
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12. Uncertainty in long term projections
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13. Data sources for solar radiation
 India Meteorological Department data from 23 field stations of the radiation
network, measured from 1986.
 NASA’s Surface Meteorology and Solar Energy data set. This holds
satellite – derived monthly data for a grid of 1°x1° covering the globe from
1984.
 The METEONORM global climatological database and synthetic weather
generator. This contains a database of ground station measurements of
irradiation and temperature. In cases where a site is over 20 km from the
nearest measurement station.
 Satellite-derived geospatial solar data products from the United States-
based NREL. Annual average DNI and GHI, latitude tilt, and diffuse data
are available at 10 km resolution for India,
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14. Typical horizontal solar irradiation in India
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15. Monthly Direct and Diffused Rations in Chennai
The annual mean GHI in Chennai is 2,021 kWh/m2. By optimally-orientating a
fixed tilt plant, the yearly sum of global irradiation may be increased to 2,048
kWh/m2. Based on this resource, a 1 MWp plant with a PR of 80% will give an
AC yield of 1,638 MWh.
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16. Mean Daily GHI
Where there is significant uncertainty in the data sources, a short term data
monitoring campaign may be considered. Short term monitoring (ideally up
to one year in duration) may be used to calibrate long term satellite-derived
data and increase the confidence in the long term energy yield prediction.
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17. Thank You
FirstGreen Consulting Private Limited
Gurgaon:
206, Tower B, Millennium Plaza, Sec 27, Gurgaon – 122002,
India
Tel.: (+91) 124 424 1750 , 9899295854
Fax: (+91) 124 424 1751
Web: www.firstgreenconsulting.in
Email: sanjayvashishtha@gmail.com
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