런타임 감사 스위트
배터리 뱅크가 임계 방전 수준에 도달하기 전에 부하를 몇 시간 동안 유지할지 정확히 예측합니다.
부하 및 배터리 데이터
뱅크 용량 및 소모
매개변수를 입력하면 결과가 실시간으로 업데이트됩니다.
런타임 공식
배터리 런타임은 저장된 에너지의 양, 소비 속도, 그리고 허용된 방전 깊이에 따라 결정됩니다.
런타임 계산
Hours = (Ah × V × DoD) ÷ Watts 배터리 용량(Ah)에 전압을 곱하여 Wh를 구하고, DoD를 적용하여 사용 가능한 에너지를 구한 다음, 와트 단위 부하로 나누어 런타임을 구합니다.
사용 가능 에너지
Usable Wh = Ah × V × DoD 저장된 모든 에너지에 접근할 수 있는 것은 아닙니다 — DoD는 배터리 손상이나 수명 단축 없이 방전할 수 있는 깊이를 제한합니다.
How to Calculate Battery Runtime
Battery runtime tells you how long a battery bank can power a given load before needing a recharge. This calculation is critical for sizing backup power systems, off-grid solar storage, portable power stations, and UPS systems. The key variables are battery capacity (Ah), system voltage, Depth of Discharge (DoD), and the power draw of connected loads.
Why Peukert's Law Matters for Large Loads
Peukert's Law states that lead-acid batteries deliver less total energy when discharged at higher rates. A 100Ah battery discharged in 1 hour may actually deliver only 55–60Ah. This effect is minimal in lithium batteries but significant in lead-acid. For critical applications, use the C-rate adjusted capacity from your battery datasheet rather than the nominal Ah rating.
DoD Limits by Battery Chemistry
- Flooded Lead-Acid: Maximum safe DoD is 50%. Going deeper dramatically accelerates sulfation and plate degradation — expect 300–500 cycles at 50% DoD.
- AGM / Sealed Lead-Acid: Slightly better at 60–80% DoD depending on the manufacturer's rating. Maintenance-free but less tolerant of overcharging.
- Lithium Iron Phosphate (LiFePO4): Safe to 80–90% DoD with 2,000–5,000+ cycles at that depth. Best long-term value despite higher upfront cost.
- NMC / NCA Lithium: Used in EVs and some portable packs. Higher energy density than LiFePO4 but less thermally stable and typically limited to 80% DoD for longevity.
Sizing for Backup Power
- Define the Load: List all devices that must run during a power outage. Include their wattage and expected hours of operation.
- Calculate Total Wh: Sum all load × hours to get total watt-hours needed per outage event.
- Apply DoD Factor: Divide required Wh by your battery's DoD to get the required gross capacity.
- Convert to Ah: Divide gross Wh by system voltage to get required Ah.
- Add a Safety Buffer: Design for 80% of nominal capacity to account for aging — a battery that starts at 100% capacity will degrade to ~80% over its useful life.