HNEI researchers from the PakaLi Battery Laboratory and GridSTART just published an analysis of a battery energy storage system degradation through seven years of field grid usage. The results showcase that the titanate based batteries showed little degradation (around 10% after 7 years) and that they are expected to exceed 15 years on the grid. Researchers also identified some inaccuracies in the online capacity estimation methodology which complicates the monitoring of the system.
The open access publication “Battery Durability and Reliability under Electric Utility Grid Operations: Analysis of On-Site Reference Tests” can be found at http://dx.doi.org/10.3390/electronics10131593. This paper was also invited to be included in the “Recent Developments and Emerging Trends of New Electrical Energy Storage Systems” special issue.