Engineering English
State of Charge
Electrical Engineering · Electronics Engineering · Energy Engineering · Last updated: July 30, 2026 · How this entry was written
Definition: The level of electric charge stored in a battery relative to its full capacity, usually expressed as a percentage. It is analogous to a fuel gauge for a battery system.
Example in context
“The energy management system curtails charging when the state of charge reaches 90% to preserve battery cycle life.”
“Enerji yönetim sistemi, batarya çevrim ömrünü korumak için şarj durumu %90'a ulaştığında şarjı kısıtlar.”
Where engineers use it
Engineers use state of charge to schedule battery charging from solar panels, prevent deep discharge, and calculate available energy for grid support. It is a critical parameter in energy management algorithms.
Synonyms: SoC, state-of-charge
In Electronics Engineering
State of charge (SOC) is the percentage of remaining energy in a battery relative to its full capacity, analogous to a fuel gauge. It is a key parameter in battery management systems for estimating runtime and protecting the battery.
“The battery management system continuously monitors the state of charge to prevent overdischarge and extend cycle life.”
In Energy Engineering
The remaining energy in a battery expressed as a percentage of its present full capacity. Management systems estimate it from voltage, current integration, and temperature to protect the cells and inform the operator.
“The management system halted discharge when the state of charge dropped to fifteen percent to avoid damaging the cells permanently.”
Practice: can you use “State of Charge” at work?
During a peak shaving test, the battery reaches 20% state of charge. The operator asks if the system can still deliver rated power for the next hour. What factors must you consider?
Show a model answer
“Monitor the state of charge to avoid over-discharging the battery bank.”
“State of Charge” in 21 languages
| English | State of Charge |
|---|---|
| Turkish | şarj durumu |
| French | état de charge |
| German | Ladezustand |
| Spanish | estado de carga |
| Chinese | 荷电状态 |
| Arabic | حالة الشحن |
| Portuguese | estado de carga |
| Russian | состояние заряда |
| Japanese | 充電状態 |
| Italian | stato di carica |
| Vietnamese | trạng thái sạc |
| Hindi | चार्ज की स्थिति |
| Thai | สถานะการชาร์จ |
| Indonesian | keadaan pengisian |
| Korean | 충전 상태 |
| Bengali | চার্জের অবস্থা |
| Dutch | laadtoestand |
| Swedish | laddningstillstånd |
| Finnish | lataustila |
| Ukrainian | стан заряду |
Frequently asked questions
What does State of Charge mean in engineering?
The level of electric charge stored in a battery relative to its full capacity, usually expressed as a percentage. It is analogous to a fuel gauge for a battery system. In Electrical Engineering, the term carries a usage-frequency rating of 10/10 in the Engineering English library.
How do you pronounce State of Charge?
State of Charge is pronounced /steɪt əv tʃɑːrdʒ/ (IPA). The Engineering English app plays audio for the term and checks your pronunciation with speech recognition.
How is State of Charge used in a sentence?
Example from an engineering context: “The energy management system curtails charging when the state of charge reaches 90% to preserve battery cycle life.”
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