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🔌 인버터 사이징

인버터 사이징 스위트

순간 최대 부하를 계산하여 시스템 다운을 방지하세요. 인버터가 시동 서지를 효과적으로 처리하도록 보장합니다.

최대 부하 분석

인버터 사이징

시동 서지는 연속 정격의 3~5배가 될 수 있습니다.

안전 프로토콜

전문 설계자는 과열 및 효율 손실을 방지하기 위해 항상 총 연속 부하의 120~125%로 인버터를 설계합니다.

최소 인버터 용량
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VA
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사이징 공식

인버터는 연속 부하와 갑작스러운 시동 서지를 동시에 처리해야 합니다.

최소 인버터 크기
VA = max(Cont × 1.25, Surge Load)

1.25 안전 계수는 과열을 방지하고 인버터가 정격 한계 이하에서 효율적으로 작동하도록 보장합니다.

모터 서지 경험 법칙
Surge ≈ Continuous Rating × 3–5×

압축기, 냉장고, 펌프는 시동 시 작동 와트의 3~5배를 소모합니다. 항상 모터 명판을 확인하세요.

How to Size a Solar Inverter

An inverter converts DC power from your solar panels or battery bank into AC power that your appliances use. Choosing the right size is critical — an undersized inverter will trip under heavy loads, while an oversized one wastes money and runs inefficiently at partial load. The two key numbers you need are total continuous wattage and largest motor surge wattage.

Continuous vs. Surge Power

Continuous power is what your devices draw during normal operation. Surge (or peak) power is the brief spike that motors, compressors, and pumps demand at startup — often 3–5 times their running draw. Your inverter must handle the surge without shutting down, even if it only lasts a fraction of a second.

Step-by-Step Inverter Sizing

  1. List All Loads: Write down every appliance you'll run simultaneously. Include lights, fans, TVs, and any motors (fridge, pump, AC).
  2. Sum the Continuous Watts: Add up the running wattage of every device that could be on at the same time.
  3. Identify the Largest Motor: Find the appliance with the highest startup surge. This is usually a refrigerator compressor or water pump.
  4. Apply the 125% Rule: Multiply your continuous total by 1.25. This is the minimum continuous rating your inverter must meet.
  5. Take the Higher Value: Compare the 125% continuous result to your surge load. Your inverter rating must exceed whichever is larger.
  6. Select a Standard Size: Inverters come in standard sizes (1000VA, 1500VA, 2000VA, 3000VA, etc.). Always round up to the next standard size.

Off-Grid vs. Grid-Tie Inverters

  • Off-Grid (Standalone): Converts battery DC to AC with no grid connection. Must be sized for your full peak load since there's no grid backup.
  • Grid-Tie: Syncs with the utility grid and can export surplus power. Does not work during outages unless a battery backup is added.
  • Hybrid: Combines both — charges batteries from solar, uses grid as backup, and can export excess. Most flexible but highest cost.