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The 5 kW Vanadium redox flow battery manufactured by Prudent Energy – the 4th generation11 of this battery, advertised as having high energy conversion efficiencies and extremely long life – was delivered at the ACEP facility in Fairbanks in August 2010. ACEP 12-03 | March 2012 Delivery Fig. 5. Initial inspection of the crated stack after inception at ACEP’s Bidwill Ave facility. The weight of the power module alone is 510 kg, while the total weight (including electrolyte tanks) is 3,000 kg. The approximate power module physical specifications are: D = 1.0m, W =1.2m, H = 1.1m. This VRB has been designed to provide energy for 2 hours to more than 8 hours depending on the application. Generally, the lifespan of flow batteries is not strongly affected by cycling. Suppliers of vanadium redox systems estimate lifespan of the cell stacks to be 15 or more years, while the balance of plant and electrolyte can have life- times of over 25 years. System suppliers also say they have achieved cycling capability of 10,000 or more cycles at 100% depth of discharge. 11 ACEP tested a 3rd generation version to failure in 2009, and the lessons learned then have been incorporated in this model. ADVANCED ENERGY STORAGE RESEARCH 9 | A C E PPDF Image | Advanced Battery Storage Systems Testing at ACEP VRB ESS
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