CircuitSecrets
Generator Calculators
Professional engineering tools for generator analysis & sizing — IEEE & IEC compliant
Calculator 01 / 05
Generator kVA ↔ kW Converter
Convert between apparent power (kVA) and real power (kW) using power factor — essential for understanding generator capacity
Power Conversion Results
► View Power Conversion Formulas
kW from kVA: kVA × Power Factor
kVA from kW: kW / Power Factor
Apparent Power: S = √(P² + Q²)
Reactive Power: Q = √(S² − P²) (kVAR)
IEC 60038 · IEEE Std 100
kVA from kW: kW / Power Factor
Apparent Power: S = √(P² + Q²)
Reactive Power: Q = √(S² − P²) (kVAR)
IEC 60038 · IEEE Std 100
Calculator 02 / 05
Generator Full Load Current (FLC)
Calculate FLC for single & three-phase generators — critical for cable sizing, protection & system design
Full Load Current Results
► View FLC Formulas
Single Phase: I = (kVA × 1000) / V
Three Phase: I = (kVA × 1000) / (√3 × V)
√3 ≈ 1.732 · Protection = 125% × FLC
IEC 60034 · NEC Article 445
Three Phase: I = (kVA × 1000) / (√3 × V)
√3 ≈ 1.732 · Protection = 125% × FLC
IEC 60034 · NEC Article 445
Calculator 03 / 05
Generator Sizing Calculator
Determine appropriate generator size — accounts for power factor, demand factor & safety margin
Generator Sizing Results
► View Sizing Formulas
Actual Load: Connected Load × Demand Factor
Required kVA: (Actual Load / PF) × (1 + Margin/100)
Standard sizes: 10, 15, 20, 25, 30, 40, 50, 62.5, 75, 100, 125, 150, 200, 250, 300, 400, 500, 625, 750, 1000 kVA
IEEE 446 · IEC 60034
Required kVA: (Actual Load / PF) × (1 + Margin/100)
Standard sizes: 10, 15, 20, 25, 30, 40, 50, 62.5, 75, 100, 125, 150, 200, 250, 300, 400, 500, 625, 750, 1000 kVA
IEEE 446 · IEC 60034
Calculator 04 / 05
Fuel Consumption Estimator
Estimate fuel consumption based on generator load — for fuel planning, operating cost & tank sizing
Fuel Consumption Results
► View Fuel Consumption Formulas
Hourly: Fuel Rate × (Load% / 100)
Daily: Hourly × 24 · Monthly: Daily × 30
Efficiency: Consumption / Actual Load (L/kWh)
Typical diesel: 0.25–0.30 L/kWh
ISO 8528 · IEC 60034
Daily: Hourly × 24 · Monthly: Daily × 30
Efficiency: Consumption / Actual Load (L/kWh)
Typical diesel: 0.25–0.30 L/kWh
ISO 8528 · IEC 60034
Calculator 05 / 05
Generator Efficiency Calculator
Calculate efficiency by comparing electrical output to mechanical input — for performance evaluation & energy audits
Efficiency Analysis Results
► View Efficiency Formulas
Efficiency η: (Output / Input) × 100 (%)
Power Loss: Input − Output (kW)
Heat Dissipation: Loss × 3412.14 (BTU/hr)
Typical range: 85–95% at rated load
Best efficiency: 75–85% loading
IEC 60034-2 · IEEE 115
Power Loss: Input − Output (kW)
Heat Dissipation: Loss × 3412.14 (BTU/hr)
Typical range: 85–95% at rated load
Best efficiency: 75–85% loading
IEC 60034-2 · IEEE 115
⚠️ Engineering Disclaimer: These calculators provide engineering estimation only. Always verify with manufacturer datasheets and comply with local electrical standards (NEC, IEC, IEEE). For critical installations, consult licensed professional engineers and conduct detailed load analysis. CircuitSecrets assumes no liability for design decisions based on these calculations.
