Translating outdoor CPV I–V measurements to a CSTC power rating and the associated uncertainty

Muller, Matthew; Kurtz, Sarah; Steiner, Marc; Siefer, Gerald

doi:10.1002/pip.2590

Translating outdoor CPV I–V measurements to a CSTC power rating and the associated uncertainty

Journal Article · Wed Mar 04 23:00:00 EST 2015 · Progress in Photovoltaics

DOI:https://doi.org/10.1002/pip.2590· OSTI ID:1401127

Muller, Matthew ^[1]; Kurtz, Sarah ^[1]; Steiner, Marc ^[2]; Siefer, Gerald ^[2]

National Renewable Energy Laboratory Golden CO 303‐384‐6164 USA
Fraunhofer ISE Freiburg Germany

Abstract

A complete procedure is presented for translating outdoor concentrator photovoltaic (CPV) I–V measurements to the Concentrator Standard Test Conditions (CTSC) (1000 W/m ² and 25 °C cell temperature). Methods are demonstrated for measuring all the necessary input parameters for the translation, including outdoor thermal transient measurements and indoor dark I–V curves. Four modules are subjected to the translation method based on multiple months of outdoor data, one module measured at National Renewable Energy Laboratory and three at Fraunhofer ISE. The modules are also characterized under a sun simulator to provide a comparison to the translation approach. The results show that translated CSTC efficiencies are in good agreement with the efficiencies from the solar simulator. Two of the modules agreed within 1%, whereas the other two modules agree within approximately 4%. An uncertainty analysis of the input parameters is discussed in the context of the total uncertainty associated with the translation to CSTC. The reference voltage and efficiency temperature coefficient are the key parameters impacting the translation uncertainty, whereas uncertainty in the outdoor data is driven by spectral and meteorological parameters. Copyright © 2015 John Wiley & Sons, Ltd.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC36-99GO10337

OSTI ID:: 1401127

Alternate ID(s):: OSTI ID: 1226148

Journal Information:: Progress in Photovoltaics, Journal Name: Progress in Photovoltaics Journal Issue: 11 Vol. 23; ISSN 1062-7995

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: United Kingdom

Language:: English

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