Alternator kVA & Power Factor Sizing
Size the alternator end, not just the engine: power factor, non-linear load, and starting kVA all land on the winding.
Result
Formula
Calculation logicWhat to check
- Alternator data sheet kVA at the site ambient and PF
- Motor starting kVA from nameplate data
Related calculators
Calculator
Duty Rating Selector (ESP / PRP / COP)
Map the application and hours to the ISO 8528 rating to specify and the NEC article that governs the installation.
Open calculatorCalculator
Generator Derating: Altitude & Temperature
Altitude and ambient temperature reduce every rating. Convert your site conditions into usable kW and the nameplate you must order.
Open calculatorCalculator
Generator Load Factor Check
See how loaded a set will actually run, and whether a light load puts it into wet-stacking territory.
Open calculatorCalculator
Generator Sizing Calculator
Running load plus the largest motor start, a growth margin, and the duty rating you actually need, expressed in kW and kVA.
Open calculatorSaved calculations
Keep the assumptions with the result.
Save this calculation to return to the inputs, result, and report anytime.
Sign in or create an account to save this calculation.