Demystifying the BESS performance metrics that matter most: SoC, SoH, cell imbalance and RTE

In the rapidly evolving global energy landscape, battery energy storage has emerged as a cornerstone for ensuring grid stability and efficiency. From helping stabilise data centre loads, to being deployed as a means of grid modernisation, to supporting the proliferation of renewables, as the world transitions towards widespread electrification, the role of BESS becomes increasingly critical. However, misunderstood metrics are quietly eroding the performance and profitability of these systems.

Watch Wärtsilä battery analytics experts Andrea Meister and Steve Merrick for a critical session that cuts through the confusion surrounding state of charge (SoC), state of health (SoH), cell imbalance, and round-trip efficiency (RTE)—parameters that directly impact real-time operations and revenue. As grid demands intensify and performance expectations rise, the margin for error is shrinking. Andrea and Steve unpack how these metrics are measured, how errors and degradation develop, and how to proactively avoid them. Viewers will gain practical insights into how these factors influence real-time usable energy and system performance.

Key takeaways

• Learn how state of charge (SoC), state of health (SoH), cell imbalance, and round-trip efficiency (RTE) are measured, and how errors and degradation are likely developing in your system.
• Understand how these key parameters are impacting the performance and profitability of your BESS.
• Gain insight the hardware and software components that impact the fidelity of your battery data and analytics and how poor data quality can impact your financial models.
• Get a view into Wärtsilä's battery analytics tool, GEMS Pulse, that is addressing these errors to ensure BESS owners can get the most value and energy out of their system.