インバーター サイジング スイート
瞬間最大負荷を計算してシステムクラッシュを防ぎます。インバーターが起動サージを効果的に処理できるようにします。
ピーク負荷分析
インバーターサイジング
起動サージは連続定格の3～5倍になることがあります。
プロの設計者は、過熱や効率低下を防ぐため、常に総連続負荷の120〜125%でインバーターをサイジングします。
サイジング計算式
インバーターは連続負荷と突発的な起動サージの両方を同時に処理する必要があります。
最小インバーターサイズ
VA = max(Cont × 1.25, Surge Load) 1.25の安全係数は過熱を防ぎ、インバーターが定格上限以下で効率的に稼働することを保証します。
モーターサージの経験則
Surge ≈ Continuous Rating × 3–5× コンプレッサー、冷蔵庫、ポンプは起動時に稼働時のワット数の3〜5倍を消費します。必ずモーターの銘板を確認してください。
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
- List All Loads: Write down every appliance you'll run simultaneously. Include lights, fans, TVs, and any motors (fridge, pump, AC).
- Sum the Continuous Watts: Add up the running wattage of every device that could be on at the same time.
- Identify the Largest Motor: Find the appliance with the highest startup surge. This is usually a refrigerator compressor or water pump.
- Apply the 125% Rule: Multiply your continuous total by 1.25. This is the minimum continuous rating your inverter must meet.
- Take the Higher Value: Compare the 125% continuous result to your surge load. Your inverter rating must exceed whichever is larger.
- 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.