State-of-the-Art Measurements for PV - Energetics Meetings and ...

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Uncertainty• What barriers are in the way of this future, and how do weovercome them?• Build a better more accurate Cavity radiometer that can beaccurately calibrated using a cryogenic radiometers with uncertaintybelow ±0.1%• Improve absolute spectral responsivity measurements to reducethe uncertainty in I sc below ±0.5%• Calibration of spectral radiometers to better than 0.1% from 300 to3000 nm.• The spatial nonuniformity of module simulators at ±2% for a ClassA spatial nonuniformity rating is a dominant error source. Small areanonuniformities can exceed ±5% for module simulators where thedistance to the bulb is small such as in Spire’s Spi-Line. Spectral andtemporal issues can be corrected for for single junction technologies.Module simulators with good spatial nonuniformity (±1%) can beachieved by a long distance 5 to 10 m from bulb but these simulatorshave bias rate artifacts that impact thin-films and high lifetime Si.National Renewable Energy Laboratory Innovation for Our Energy Future
OutlinePV Theory– What is the true value?Primary Reference Cell Methods– Absolute total irradiance, Absolute Spectral Irradiance orAbsolute Spectral ResponsivityConcentrator PV– Linearity• Isc vs. total irradiance 1 to 1000 suns from spectral responsivity• Reference detector for use 1 to 1000 suns pulsed or continuous– Flux mapping up to 2000 suns continuous up to 2 by 2 cm.Broadband detector– GaInAs cell with thin InP window responds form 300 to 2200 nmsuitable for use in spectral radiometers and for quantumefficiency.National Renewable Energy Laboratory Innovation for Our Energy Future
Page 1 and 2: State-of-the-Art Measurements for P
Page 4 and 5: What is the True Value? = P maxE to
Page 6 and 7: Module UncertaintyThe PV community
Page 8 and 9: NREL U.S. - Absolute Total Irradian
Page 10 and 11: Absolute Spectral ResponsivityNatio
Page 12 and 13: Space Based CalibrationsPrimary AM0
Page 16 and 17: Isc Linearity with Total Irradiance
Page 18 and 19: Detectors that respond from 300 to
Page 20 and 21: Total irradiance - Traceability to
Page 22 and 23: Total irradiancePyranometer -180°
Page 24 and 25: Recommendations for NIST related ac
Page 26: Recommendations for NIST related ac

State-of-the-Art Measurements for PV - Energetics Meetings and ...

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