Field Aging Testbed for Behind-the-Meter PV + Energy Storage

Research output: NRELPoster


Small DC-coupled battery test systems are deployed at NREL to evaluate capacity fade models and report on performance parameters such as round-trip efficiency under indoor and outdoor deployment scenarios. Initial commercial battery products include LG Chem RESU Lithium-ion and Avalon vanadium-redox flow batteries. Adapting indoor lab-scale test methods to outdoor systems has challenges, including maintaining constant temperature and fully controlling batteries through standard discharge curves. Initial measurements show the Lithium Ion battery systems performing within expectation, near 85% round-trip efficiency. Initial lifetime modeling and measurements indicate battery capacity may degrade by 20%-35% over 10 years.
Original languageAmerican English
StatePublished - 2019

Publication series

NamePresented at the 46th IEEE Photovoltaic Specialists Conference (PVSC 46), 16-21 June 2019, Chicago, Illinois

NREL Publication Number

  • NREL/PO-5K00-73988


  • battery test systems
  • lithium ion batteries
  • vanadium-redox flow batteries


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