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Generator Useful Power Calculator — result sheet
Estimate useful real output and energy from a generator apparent-power rating, power factor, efficiency, and operating time.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Real electrical output = kVA × power factor; useful output = real output × efficiency; energy = useful output × hours.
Generator nameplates, power factor, and efficiency describe different quantities. This page keeps them separate and shows the planning result without inventing fuel consumption or a code-compliant loading limit.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Apparent-power rating — kVA; minimum 1.0E-6; maximum 1000000000
- Efficiency — %; minimum 1.0E-6; maximum 100
- Power factor — %; minimum 0; maximum 100
- Operating time — hours; minimum 0; maximum 1000000000
Worked example
| Input | Value |
|---|---|
| Apparent-power rating | 10 |
| Efficiency | 90 |
| Power factor | 80 |
| Operating time | 4 |
Real output before efficiency = 8 kW, useful output = 7.2 kW, useful energy = 28.8 kWh, and implied input power = 8 kW.
Assumptions and limits
- The entered kVA is the apparent-power rating for the scenario.
- Power factor and efficiency are percentages supplied for the operating condition.
- The values remain constant for the entered operating time.
- Fuel rate, voltage, phase balance, harmonics, thermal limits, surge behavior, and protection are not calculated.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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