Common use of Performance Testing to Verify Guaranteed Capacity Clause in Contracts

Performance Testing to Verify Guaranteed Capacity. 1.1.1 Procedure To demonstrate that the Guaranteed Capacity has been satisfied, a capacity test shall be performed in accordance with ASTM E2848-13, Standard Test Method for Reporting Photovoltaic Non-Concentrator System Performance (“Capacity Test”). For this test, unless otherwise agreed to in writing by both Client and EPC Contractor, the photovoltaic system power, P, shall be taken to be the AC power at the point-of-interconnect, plane-of-array irradiance shall be measured with a photovoltaic reference cell, and system performance data required for the test shall be collected using the monitoring system provided with the System. Reporting conditions for the test shall be Nominal Terrestrial Environment (NTE) conditions (800 W/m2, 20 °C ambient temperature, 1 m/s wind speed) unless the NTE values are not encompassed by the range of actual or expected irradiance, temperature, and wind speed values during the test period or inverter clipping occurs at NTE conditions, in which case alternate reporting conditions may be used. If alternate reporting conditions are used, they shall be selected in accordance with ASTM E2939-13, Standard Practice for Determining Reporting Conditions and Expected Capacity for Photovoltaic Non-Concentrator Systems. The terms “photovoltaic system power, P”, “plane-of-array irradiance”, and “reporting conditions” shall have the meanings as defined in ASTM E2848.