A startup in Freiburg is taking a circular approach to energy storage by repurposing batteries from e-scooters into stationary systems for commercial use. EDENenergy, which emerged from research at Fraunhofer ISE, completed its inaugural delivery in mid-October: a 70 kWh storage unit assembled from 112 used e-scooter batteries. The identity of the customer remains undisclosed.
Modular design allows in-service replacements
Rather than breaking down the batteries, EDENenergy's approach relies on proprietary power electronics that integrate disparate battery units and manage communication across all modules. The system permits individual modules to be swapped out without shutting down operations, with remote monitoring enabling predictive maintenance. According to the company, this design keeps the installation at its rated 70 kWh capacity even after a decade of use, with spent batteries sent for recycling.
EDENenergy initially estimated the used batteries would retain 80% of their original health, but testing revealed that actual remaining capacity frequently exceeded 90%. The company has not specified the methodology behind these capacity assessments.
Standardization and sourcing challenges
Each new battery chemistry demands customization of connectors, battery management systems, and communication protocols. To secure sufficient quantities of identical units, EDENenergy currently partners with fleet operators managing e-scooter networks. Looking ahead, the startup is advocating for industry-wide standardized communication protocols and regulatory frameworks governing the reuse of mobile batteries in stationary applications.
The founding team brings experience from Fraunhofer ISE's power electronics division. EDENenergy is developing systems scaling up to 300 kWh and is initially focusing on mid-sized enterprises with existing solar installations. Government support programs can cover up to half the cost of storage systems for pilot deployments.
Source: Battery-News
