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.

家庭储能系统在住宅光伏系统集成中发挥着重要作用，最近在全球范围内经历了强劲的市场增长。然而，缺乏量化现场运行期间容量衰减的标准化方法，因此欧洲电池法规要求制定可靠且透明的健康状况估计。在这里，我们展示了来自德国 21 个私营锂离子系统的真实数据，这些数据基于长达 8 年的高分辨率现场测量。我们根据运营数据开发了一种可扩展的容量估算方法，并通过定期的现场容量测试对其进行验证。结果表明，系统每年平均损失约两到三个百分点的可用容量。我们的贡献包括发布了一个有影响力的数据集，包含约 106 个系统年、140 亿个数据点和 146 GB，旨在解决该领域公共数据集的短缺问题。