Generator Calculators – kVA to kW, Full Load Current, Sizing & Fuel Consumption | CircuitSecrets
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Generator Calculators
Professional Engineering Tools for Generator Analysis & Sizing
Generator kVA ↔ kW Converter
Convert between apparent power (kVA) and real power (kW) using power factor. Essential for understanding generator capacity and electrical load requirements.
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Power Conversion Formulas:
kW = kVA × Power Factor
kVA = kW / Power Factor
Apparent Power (S) = √(P² + Q²)
Where: P = Real Power (kW), Q = Reactive Power (kVAR)
kW = kVA × Power Factor
kVA = kW / Power Factor
Apparent Power (S) = √(P² + Q²)
Where: P = Real Power (kW), Q = Reactive Power (kVAR)
Generator Full Load Current (FLC) Calculator
Calculate the full load current for single-phase and three-phase generators. Critical for cable sizing, protection device selection, and electrical system design.
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Full Load Current Formulas:
Single Phase: I = (kVA × 1000) / V
Three Phase: I = (kVA × 1000) / (√3 × V)
Where: I = Current (A), kVA = Apparent Power, V = Voltage
√3 ≈ 1.732
Single Phase: I = (kVA × 1000) / V
Three Phase: I = (kVA × 1000) / (√3 × V)
Where: I = Current (A), kVA = Apparent Power, V = Voltage
√3 ≈ 1.732
Basic Generator Sizing Calculator
Determine the appropriate generator size for your electrical load. Accounts for power factor, demand factor, and safety margin to ensure reliable operation and prevent overloading.
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Generator Sizing Formulas:
Actual Load = Connected Load × Demand Factor
Required kVA = (Actual Load / Power Factor) × (1 + Safety Margin/100)
Recommended Size = Next standard generator rating above Required kVA
Standard Sizes: 10, 15, 20, 25, 30, 40, 50, 62.5, 75, 100, 125, 150, 200, 250, 300, 350, 400, 500, 625, 750, 1000 kVA
Actual Load = Connected Load × Demand Factor
Required kVA = (Actual Load / Power Factor) × (1 + Safety Margin/100)
Recommended Size = Next standard generator rating above Required kVA
Standard Sizes: 10, 15, 20, 25, 30, 40, 50, 62.5, 75, 100, 125, 150, 200, 250, 300, 350, 400, 500, 625, 750, 1000 kVA
Generator Fuel Consumption Estimator
Estimate fuel consumption based on generator load. Helps in planning fuel requirements, operating cost analysis, and fuel tank sizing for continuous or backup power applications.
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Fuel Consumption Formulas:
Hourly Consumption = Fuel Rate × (Load% / 100)
Daily Consumption = Hourly Consumption × 24 hours
Monthly Consumption = Daily Consumption × 30 days
Typical Fuel Rate: 0.25 to 0.30 L/kWh (diesel generators)
Hourly Consumption = Fuel Rate × (Load% / 100)
Daily Consumption = Hourly Consumption × 24 hours
Monthly Consumption = Daily Consumption × 30 days
Typical Fuel Rate: 0.25 to 0.30 L/kWh (diesel generators)
Generator Efficiency Calculator
Calculate generator efficiency by comparing electrical output power to mechanical input power. Essential for performance evaluation, energy audits, and comparing different generator models.
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Efficiency Formulas:
Efficiency (η) = (Output Power / Input Power) × 100
Power Loss = Input Power - Output Power
Typical Generator Efficiency: 85% to 95% at rated load
Efficiency decreases at partial loads (typically best at 75-85% load)
Efficiency (η) = (Output Power / Input Power) × 100
Power Loss = Input Power - Output Power
Typical Generator Efficiency: 85% to 95% at rated load
Efficiency decreases at partial loads (typically best at 75-85% load)
⚠️ ENGINEERING DISCLAIMER: This calculator provides engineering estimation only. Always verify with manufacturer data, generator datasheets, and comply with local electrical standards (NEC, IEC, IEEE). For critical installations, consult with licensed professional engineers and conduct detailed load analysis. CircuitSecrets assumes no liability for design decisions based on these calculations.
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