Open Circuit Voltage Test. The open circuit voltage test provides a simple method to determine that a string is properly connected and that all strings are producing the appropriate level of voltage. This test should be done under stable sky conditions. a) Measure string Voc/Isc at the combiner box for all strings at the combiner box. b) Measure average module temperature. c) Measure plane of array irradiance. d) Contractor shall test, record, and analyze all collected data. Data analysis shall include, at minimum, a calculation that shows the relative Voc, Imp & Pmax values for each string at STC. e) Contractor shall submit the test data, analysis, and results within one (1) week after testing has been completed. All calculations shall be provided in Excel format with calculation formulas shown. f) A written statement shall be provided with each data submission that states the tested string values (Voc, Isc, Vmp, Imp, Pmax) are within manufacturer tolerances at STC. g) If any string is abnormal, or not performing as expected, a detailed investigation and root cause analysis shall take place. All analysis results and corrections made shall be documented in the data submission and report summary including all abnormalities and/or problematic strings.
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Sources: Engineering, Procurement and Construction Agreement, Engineering, Procurement and Construction Agreement (Powersecure International, Inc.), Engineering, Procurement and Construction Agreement (Powersecure International, Inc.)