에너지 저장 플래너
어둠 속에 남겨지지 마세요. 야간 사용이나 다일 백업에 필요한 정확한 배터리 뱅크 크기를 계산합니다.
저장 매개변수
배터리 뱅크 사이징
저장 공식
배터리 용량은 필요한 에너지량, 필요한 시간, 방전 가능한 깊이에 따라 달라집니다.
필요 Wh (DoD 포함)
Total Wh = (Daily Wh × Days) ÷ DoD DoD로 나누면 저장된 에너지의 안전한 부분만 사용하게 되어 배터리 수명과 사이클 수를 보호합니다.
암페어시 용량
Ah = Total Wh ÷ System Voltage 배터리 용량은 특정 전압에서 Ah로 표시됩니다. 200Ah 24V 뱅크는 총 4,800Wh의 에너지를 저장합니다.
How to Size a Solar Battery Bank
A battery bank stores solar energy collected during the day so you can use it at night or during cloudy periods. Getting the size right means you never run out of power during your designed autonomy window — and you don't destroy your batteries by over-discharging them. The key parameters are daily energy load (Wh), days of autonomy, system voltage, and Depth of Discharge (DoD).
Understanding Depth of Discharge (DoD)
DoD is the percentage of a battery's capacity you can safely use before recharging. Lead-acid batteries should not be discharged below 50% (DoD = 0.5) or their lifespan drops dramatically. Lithium (LiFePO4) batteries can safely reach 80–90% DoD, making them far more space-efficient per usable kWh.
Battery Chemistry Comparison
- Flooded Lead-Acid (FLA): Cheapest upfront cost. Requires regular water top-ups and venting. Maximum 50% DoD. Cycle life ~500 cycles at 50% DoD.
- AGM / GEL Sealed: Maintenance-free and spill-proof. 50–80% DoD depending on brand. Better suited to partial-state-of-charge operation than flooded.
- Lithium (LiFePO4): Premium cost but 2–4× the cycle life of lead-acid. 80–90% DoD, lighter, and no maintenance. Best long-term value for most solar installations.
Step-by-Step Battery Sizing
- Calculate Daily Wh Load: Multiply each appliance's wattage by the hours per day it runs. Sum all appliances.
- Decide Days of Autonomy: How many sunless days must the system sustain? 1–2 days is typical for grid-hybrid; 3–5 days for full off-grid resilience.
- Apply Your DoD Factor: Divide the total energy needed by your battery's DoD rating to get the required gross capacity.
- Convert Wh to Ah: Divide gross Wh by your system voltage (12V, 24V, or 48V). Higher voltage = fewer amps = thinner wire required.
- Select Battery Count: Divide the total Ah by the Ah rating of your chosen battery, then round up to the nearest whole number.