With the rapid growth in distributed solar, residential energy storage systems are poised to become an increasingly important component of a robust, reliable, decarbonized electric grid. While multiple vendors have recently introduced consumer storage to the market, it is difficult to ascertain how will these products perform under real-world conditions to address the real-world challenges introduced by high penetration PV. Unlike other, more mature, grid-edge devices, there is no established methodology for characterizing the performance of residential energy storage.
Fraunohofer CSE, together with the Fraunhofer Institute for Solar Energy in Freiburg, Germany, have developed a Residential Energy Storage System (RESS) Test Protocol that addresses the need for rigorous, independent testing and evaluation of residential energy storage systems. Leveraging Fraunhofer ISE’s extensive experience with the more-established energy storage market in Germany, our approach evaluates the performance of RESS’s across a range of duty cycles and test conditions that reflect real-world conditions. This testing can provide valuable insight to a wide array of stakeholders, such as utilities, vendors, and end-users.