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Understanding State of Charge (SoC)

March 4, 2025

State of Charge (SoC) is one of the most important state estimations for batteries. It describes how much charge is left in your battery, which can be used, for example, to provide grid services like frequency regulation or arbitrage.

A glowing green battery stands out among a sea of metallic cylindrical batteries.
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An inaccurate State of Charge (SoC) can cause safety issues and economic losses due to non-reliable storage operation. Not being able to deliver the energy that had been promised to the grid can lead to high fines or even permanent exclusion from grid service markets. Major challenges exist when it comes to calculating State of Charge, often leading to inaccurate SoC readings.

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