Wechselrichter Dimensionierung Suite
Vermeiden Sie Systemausfälle, indem Sie Ihre gleichzeitige Spitzenlast berechnen. Stellen Sie sicher, dass Ihr Wechselrichter Anlaufstromspitzen effektiv bewältigt.
Spitzenlastanalyse
Wechselrichter-Dimensionierung
Der Anlaufstrom kann das 3- bis 5-fache der Dauerleistung betragen.
Professionelle Planer dimensionieren Wechselrichter stets auf 120-125 % der gesamten Dauerlast, um Überhitzung und Effizienzverlust zu vermeiden.
Die Dimensionierungsformel
Ein Wechselrichter muss sowohl die Dauerlast als auch plötzliche Anlaufstromspitzen gleichzeitig bewältigen.
Mindestgröße des Wechselrichters
VA = max(Cont × 1.25, Surge Load) Der Sicherheitsfaktor von 1,25 verhindert Überhitzung und sorgt dafür, dass der Wechselrichter effizient unterhalb seiner Nennobergrenze arbeitet.
Faustregel für Motoranlaufstrom
Surge ≈ Continuous Rating × 3–5× Kompressoren, Kühlschränke und Pumpen ziehen beim Start das 3- bis 5-fache ihrer Laufleistung. Überprüfen Sie stets das Typenschild des Motors.
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.