Solar Resource Assessment


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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.

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Solar Resource Assessment

  1. 1. Solar resource AssessmentAF-Mercados EMI
  2. 2. Solar Radiation ComponentsAF-Mercados EMI 2 FirstGreen
  3. 3. Average GHI and DNI In India Average GHI in India Average DNI in India AF-Mercados EMI 3 FirstGreen
  4. 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%.AF-Mercados EMI 4 FirstGreen
  5. 5. Land Based MeasurementOn‐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 SupplyAF-Mercados EMI 5 FirstGreen
  6. 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 ValuesAF-Mercados EMI 6 FirstGreen
  7. 7. Data Summaries Site Description Solar Statistics Meteorological Statistics Monthly and Diurnal Trends O&M SummaryAF-Mercados EMI 7 FirstGreen
  8. 8. Investment grade solar resource assessmentAF-Mercados EMI 8 FirstGreen
  9. 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 AF-Mercados EMI 9 FirstGreen
  10. 10. Adjusting to the long term AF-Mercados EMI 10 FirstGreen
  11. 11. Data uncertaintyAF-Mercados EMI 11 FirstGreen
  12. 12. Uncertainty in long term projectionsAF-Mercados EMI 12 FirstGreen
  13. 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,AF-Mercados EMI 13 FirstGreen
  14. 14. Typical horizontal solar irradiation in IndiaAF-Mercados EMI 14 FirstGreen
  15. 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.AF-Mercados EMI 15 FirstGreen
  16. 16. Mean Daily GHIWhere there is significant uncertainty in the data sources, a short term datamonitoring campaign may be considered. Short term monitoring (ideally upto one year in duration) may be used to calibrate long term satellite-deriveddata and increase the confidence in the long term energy yield prediction. AF-Mercados EMI 16 FirstGreen
  17. 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: Email: sanjayvashishtha@gmail.comAF-Mercados EMI 17 FirstGreen