Shutterstock/Victor Josan

The Germans will teach the world to properly test solar energy storage systems


A comparison of the test results of the same energy storage systems shows that the data obtained have a significant variation in measurements from one laboratory to another. This does not allow an objective assessment of the capabilities of energy storage systems and negatively affects the speed of propagation of solar farms. And something needs to be done with this.

Shutterstock / Victor Josan

Shutterstock / Victor Josan

In order to take the quality of measuring the efficiency of energy storage systems to a new level, the Testbench project has been launched in Germany, which is expected to form the basis of the world standard.

Large and small operators of solar power plants, and even households equipped with solar panels, strive most efficiently (read – with the greatest economic return) to manage the energy generated by solar panels. Since this energy has a pronounced inconsistency, energy storage systems (storage arrays) come to the fore. As it turned out, today there is no standard to evaluate all the key parameters of such systems with good repeatability of test results.

The Testbench project is designed for two years (until December 31, 2021) and is funded by the German Federal Ministry of Economics and Energy (BMWi). Research work on the project is carried out by Fraunhofer IEE, Karlsruhe Institute of Technology (KIT), VDE | DKE and TÜV Rheinland. The project is presented as a creation. “Test methods for determining the effectiveness of solar energy storage systems – from guidelines to standards”. Again, it focuses on reproducibility and comparability of the results obtained at various test benches of the project partners.

The results will be included in the standardization work “Characteristics of stationary battery storage systems” (AK 371.0.9.) Of the German Commission for Electrical, Electronic and Information Technology DIN and VDE (DKE). As German manufacturers play and intend to play one of the world’s leading roles in the production of energy storage systems, research results will also be included in international standards.

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