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ACEP 12-03 | March 2012 Table I. Performance characteristics and specifications: 5 Kw VRB Power Energy storage capacity Dimensions, power module Weight, power module Weight, Total +ve Electrolyte -ve Electrolyte Electrolyte, operating temp. range Allowable storage temp. Open circuit voltage at 0% and 100% capacity Max. charge voltage Min. voltage on discharge Max. charge current Max. discharge current (continuous) Max. discharge current (<300 s) Continuous power at beginning of discharge Continuous power at end of discharge Duty cycle 5 kW 20 kWh 1m x 1.2m x 1.1 m 510 kg 3,000 kg Vanadyl/Vanadium sulphate HypovanadousVII/VanadousVIII sulphate 10 to 35 degC -25 to 75 degC 50 VDC to 56 VDC 58.9 VDC 42 VDC 140 ADC 140 ADC 175 ADC 7.0 kW 5.25 kW 100% Table I gives the specifications and ideal performance characteristics for the VRB. The design life of the 5 kW, 20kWh battery is pegged at slightly over 10,000 cycles (and/or a service life of 100,000 hrs). Part of the performance and qualification testing is to establish the roundtrip efficiencies at various settings, the overall efficiency of the flow battery system, and cycle life. The electrolyte is fairly robust but is not to be exposed to extreme temperatures. As regards operational limits and suitability for the cold Alaskan climate, the recommended electrolyte temperature range is 10 to 35 degC, at a non-condensing humidity of 0% to 95%. Altitude range is flexible: from 0 to 3,000 m. The allowable storage temperature range is -25 to 70 degC. Battery system performance specifications based on preliminary testing showed very little deviation from the manufacturer specs shown in the Table below. The design life of the battery is pegged at slightly over 10,000 cycles (and/or a service life of 100,000 hrs). As expected, maintenance has to be scheduled at a predetermined interval, depending on the battery offline duration that may be tolerated. For an offline duration of less than 2 hrs, maintenance should be carried out every 9,000 hrs, while for a maintenance interval of every 27,000 hrs may be adopted if an 8 hr offline duration is possible. ADVANCED ENERGY STORAGE RESEARCH 14 | P a g ePDF Image | Advanced Battery Storage Systems Testing at ACEP VRB ESS
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