IEC 62932-2-1-2020 Flow battery energy systems for stationary applications – Part 2-1: Performance general requirements and test methods

IEC 62932-2-1-2020 Flow battery energy systems for stationary applications – Part 2-1: Performance general requirements and test methods. 4 General requirements The FBES or FBS shall be designed to withstand mechanical stresses, vibrations and shocks during transportation, handling and use. The manufacturer shall provide documentation for transportation, installation, commissioning, operation, maintenance, and disposal of the FBES or FBS. The FBES or FBS shall be characterized by appropriate performance parameters, including rated power, rated energy, rated energy efficiency, maximum output and input powers. More information, such as energy or energy efficiency at different power levels (see Annex A), will help the user know and use the FBES or FBS better. Safety related requirements and methods of test shall be in accordance with IEC 62932-2-2. 5 General test conditions 5.1 Accuracy of measuring instruments 5.1.1 Voltage measurement The instruments used shall be of an accuracy class equal to 1 % or better. The internal resistance of the voltmeter used shall be at least 1 kΩ/V. 5.1.2 Current measurement The instruments used shall be of an accuracy class equal to 1 % or better. Particular attention shall be given to the accuracy of DC and AC current measurement devices as any degraded accuracy or instability will negatively impact the precision of energy and efficiency determinations. 5.1.3 Electric energy measurement The instruments used shall be of an accuracy class equal to 1 % or better. Particular attention shall be given to the accuracy of DC and AC power and energy measurement devices as any degraded accuracy or instability will negatively impact the precision of energy and efficiency determinations. 5.1.4 Temperature measurement The instruments used shall have a resolution of 0,5 K and the accuracy of the instruments shall be ±1 K or better. 5.1.5 Time measurement The instruments used shall have a resolution of 1 s and the accuracy of the instruments shall be 1 % of the measured time interval or better. 5.2 Ambient temperature All tests of an FBES or FBS shall be carried out at an ambient temperature of 25 °C ± 5 K unless otherwise specified in a test clause or agreed by the manufacturer and user. The ambient temperature shall be measured and reported. The measuring instrument or probe shall be shielded from draught and radiant heating. During a test, the FBES or FBS will operate spontaneously at a temperature different to the ambient one due to energy conversion...