Genset Fuel Efficiency and Theft Check
Is the diesel you filled really being burned?
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Genset Fuel Efficiency and Theft Check by TheCalcTools
How the Genset Fuel Efficiency and Theft Check works
Enter run hours and average load from the genset meter or logger.
Enter the litres actually issued or consumed in the same period and your benchmark efficiency.
The tool compares actual and expected fuel and flags large gaps.
The formula
Worked example
Using the default values shown in the calculator:
| Running hours in the period | 120 |
|---|---|
| Average load (kW) | 12 |
| Diesel consumed (litres) | 520 |
| Benchmark (kWh per litre) | 3.3 |
| Allowed variance (%) | 10 % |
| Diesel price (PKR per litre) | Rs275 |
- Energy = 120 × 12 = 1,440 kWh; actual efficiency = 2.77 kWh/L.
- Expected fuel at 3.3 kWh/L = 436 L; extra = 84 L (19.2%), worth $23,000.
- Result: Investigate: consumption is above the allowed variance.
Result:
| Energy generated (kWh) | 1,440 |
|---|---|
| Actual efficiency (kWh per litre) | 2.77 |
| Expected fuel at benchmark (litres) | 436 |
| Extra fuel used (litres) | 84 |
| Variance from expected | 19.2% |
| Cost of extra fuel (PKR) | Rs 23,000 |
| Result | Investigate: consumption is above the allowed variance |
Frequently asked questions
What can cause high fuel use?
Low load (below about 30%), poor maintenance, injector or filter problems, leaks, wrong meter readings, or diesel theft. Check each before concluding theft.
How accurate is the check?
It depends on accurate run hours, load and fuel records. Use a fuel-level sensor or flow meter where possible.
Sources and further reading
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This calculator gives estimates for planning only. Electrical installations must be designed, checked and carried out by qualified personnel following local codes and the equipment manufacturer's data. Never rely on this result alone for safety-critical decisions. See our disclaimer.