Generator fuel cost calculator

Fuel rate (L/h) ≈ kVA × load × specific consumption. Typical diesel gensets: 0.25 L/kWh at 75% load. Petrol portable: 0.4 L/kWh. Generators are most efficient at 70–80% load.

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Typical consumption rates

  • Diesel: 0.22–0.28 L per kWh produced (genset efficient zone).
  • Petrol: 0.35–0.45 L per kWh — smaller portable units only.
  • LPG / propane: 0.4–0.5 kg per kWh.
  • Below 30% load, fuel efficiency drops sharply — over-sized gensets waste fuel.