Assessment of Residential Energy Storage Systems


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.


  • Many different energy storage products coming to the market, but difficult to differentiate and assess real-world performance
  • No established test methodology to compare small-scale residential storage systems on an apples-to-apples to basis


  • Third-party assessment of residential energy storage system performance across a range of applications under real-world conditions
  • Services targeted to utilities, vendors, and end-users


Tsz Yip
Technical Staff / Senior Project Engineer, Grid Integration
Office +1 (617) 379-5702