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Energy & Renewables vocabulary · Energy Storage

State of charge

Meaning in energy & renewables, with examples

nounCommon term

In energy & renewables, state of charge means: How full a battery is at a given moment, shown as a percentage of its usable capacity, from 0 percent (empty) to 100 percent (full).

In Turkish: şarj durumu, doluluk oranı

How it is used

Shortened to SoC or SOC. Battery management systems and operators track the state of charge constantly and keep it within limits, for example between 10 and 90 percent, to protect battery life. Related terms are depth of discharge (DoD) and state of health (SoH).

Example sentences

  1. The state of charge was 85 percent at 5 p.m., ready for the evening peak.

  2. Keep the state of charge above 20 percent to reserve capacity for frequency services.

Common collocations

  • state of charge (SoC)
  • depth of discharge
  • state of health
  • battery management system
  • battery storageStoring electricity in large rechargeable batteries so it can be released later, for example during the evening peak or when the grid needs fast support.
  • lithium-ion batteryA rechargeable battery in which lithium ions move between the electrodes. It is used in phones, electric vehicles and most new grid-scale storage projects.
  • round-trip efficiencyThe share of the energy put into a storage system that can be taken out again after losses in charging, storing and discharging, shown as a percentage.
  • energy storageTechnologies that capture energy when it is available and release it later when it is needed, such as batteries, pumped hydro and thermal storage.

This word in other fields

The same English word can have a different meaning in another field:

More terms: Energy Storage

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