Multi-year field measurements of home storage systems and their use in capacity estimation

Jan Figgener (), Jonas van Ouwerkerk, David Haberschusz, Jakob Bors, Philipp Woerner, Marc Mennekes, Felix Hildenbrand, Christopher Hecht, Kai-Philipp Kairies, Oliver Wessels and Dirk Uwe Sauer
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Jan Figgener: RWTH Aachen University
Jonas van Ouwerkerk: RWTH Aachen University
David Haberschusz: RWTH Aachen University
Jakob Bors: RWTH Aachen University
Philipp Woerner: RWTH Aachen University
Marc Mennekes: RWTH Aachen University
Felix Hildenbrand: RWTH Aachen University
Christopher Hecht: RWTH Aachen University
Kai-Philipp Kairies: RWTH Aachen University
Oliver Wessels: RWTH Aachen University
Dirk Uwe Sauer: RWTH Aachen University

Nature Energy, 2024, vol. 9, issue 11, 1438-1447

Abstract: Abstract Home storage systems play an important role in the integration of residential photovoltaic systems and have recently experienced strong market growth worldwide. However, standardized methods for quantifying capacity fade during field operation are lacking, and therefore the European batteries regulation demands the development of reliable and transparent state of health estimations. Here we present real-world data from 21 privately operated lithium-ion systems in Germany, based on up to 8 years of high-resolution field measurements. We develop a scalable capacity estimation method based on the operational data and validate it through regular field capacity tests. The results show that systems lose about two to three percentage points of usable capacity per year on average. Our contribution includes the publication of an impactful dataset comprising approximately 106 system years, 14 billion data points and 146 gigabytes, aiming to address the shortage of public datasets in this field.

Date: 2024
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DOI: 10.1038/s41560-024-01620-9

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