Field-Aging Test Bed for Behind-the-Meter PV + Energy Storage: Preprint

Research output: Contribution to conferencePaper


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 at current rates.
Original languageAmerican English
Number of pages8
StatePublished - 2019
Event46th IEEE Photovoltaic Specialists Conference (PVSC 46) - Chicago, Illinois
Duration: 16 Jun 201921 Jun 2019


Conference46th IEEE Photovoltaic Specialists Conference (PVSC 46)
CityChicago, Illinois

Bibliographical note

See NREL/CP-5K00-76288 for paper as published in IEEE proceedings

NREL Publication Number

  • NREL/CP-5K00-74003


  • battery
  • capacity fade
  • field testing
  • li-ion lithium ion


Dive into the research topics of 'Field-Aging Test Bed for Behind-the-Meter PV + Energy Storage: Preprint'. Together they form a unique fingerprint.

Cite this