FREE TOOL · DIESEL AED 4.30/L · SEPTEMBER 2026

Generator Fuel Consumption Calculator

Litres per hour by kVA and load, the monthly diesel bill at this month's UAE price — and how much of what you buy never reaches the engine.

GENSET.FUELDIESEL AED 4.30/L · SEPTEMBER 2026

Sites rarely run above 70%. Below 30% for long periods causes wet-stacking.

EXPECTED DIESEL BILL

AED 14,296 / month

3,325 L/month · AED 171,553/year · AED 1.15 per kWh

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Invoices say one number, the tank says another. Generator monitoring logs every litre in and out, run hours and load — the gap becomes a report, not a guess.

1 × 100 kVA (80 kW) at 60% load

Typical consumption curve, 0.27 L per kWh at full load, ±10% by engine. Substitute your datasheet L/h if you have it.

Per generator

12.8 L/h

Per generator per day

128 L

All generators per month

3,325 L

Per year

39,896 L

Energy produced

12,480 kWh/mo

CO₂

8.9 t/mo

TYPICAL SHRINKAGE ON UNMETERED SITES

AED 715–2,144 / month

5–15% of diesel bought for site generators is never burned in them. Enter your monthly delivered litres above to see your own gap.

  • Run hours per generator: 260 h/month → oil and filter service every 250 h ≈ 12.5 services a year each.
  • Diesel price defaults to this month's UAE rate (September 2026); bulk supply to site is usually priced differently — enter your invoice rate.

GENERATOR DIESEL

How much diesel does a generator use and how do you detect fuel theft on site?

A diesel generator burns about 0.27 litres per kWh at full load — 21.6 L/h for a 100 kVA set, 54.0 L/h for 250 kVA, 108.0 L/h for 500 kVA — and roughly half that at 50% load, since an idling engine still burns ~15% of its full-load rate. Two 100 kVA sets at 60% load for 10 hours a day, 26 days a month, use about 6,649 litres, or AED 28,592 at September 2026's UAE diesel price of AED 4.30. To detect theft, compare supplier deliveries with that expected burn: on unmetered sites 5–15% of purchased diesel is typically unaccounted for. A tank-level sensor with timestamped fill and drop events turns the gap into evidence.

Diesel generator fuel consumption chart

Litres per hour by generator size and load, 0.8 power factor, 0.27 L/kWh at full load. Last reviewed 2026-09-23.

Diesel generator fuel consumption in litres per hour by kVA and load
SizekW25% load50% load75% load100% load
20 kVA161.3 L/h2.2 L/h3.2 L/h4.3 L/h
30 kVA241.9 L/h3.2 L/h4.7 L/h6.5 L/h
45 kVA362.8 L/h4.9 L/h7.1 L/h9.7 L/h
60 kVA483.8 L/h6.5 L/h9.5 L/h13.0 L/h
100 kVA806.3 L/h10.8 L/h15.8 L/h21.6 L/h
150 kVA1209.4 L/h16.2 L/h23.7 L/h32.4 L/h
200 kVA16012.5 L/h21.6 L/h31.5 L/h43.2 L/h
250 kVA20015.7 L/h27.0 L/h39.4 L/h54.0 L/h
350 kVA28021.9 L/h37.8 L/h55.2 L/h75.6 L/h
500 kVA40031.3 L/h54.0 L/h78.8 L/h108.0 L/h
750 kVA60047.0 L/h81.0 L/h118.3 L/h162.0 L/h
1000 kVA80062.6 L/h108.0 L/h157.7 L/h216.0 L/h
1500 kVA120094.0 L/h162.0 L/h236.5 L/h324.0 L/h

Typical values; consult the engine datasheet for a specific set. Tier-3/4 engines and modern common-rail units sit at the low end; older mechanical-injection sets and 50 °C ambient at the high end. Sources: manufacturer consumption charts (Cummins, Perkins, CAT rental fleets) cross-checked 2026-09-23.

Meter the tank, not the invoice

Construction sites, events, telecom towers and rental fleets — the same sensor works on all of them.

GENSET

Generator Monitoring

Fuel level, run hours, load and alarms from every set — fixed or rental — on one dashboard.

FUEL.CTRL

Fuel Control System

Tank-level sensors that log every fill and drop, matched against invoices.

ASSET

Asset Tracking

Where each rental generator is, whether it is running, and when it is due back.

FREE.TOOL

UAE Fuel Prices

This month's diesel price and history since 2023.

FREE.TOOL

Fleet CO₂ Calculator

Add the generator tonnes to the fleet figure for the climate-law report.

ALL.TOOLS

All Free Fleet Tools

Calculators, checkers and generators for UAE fleets in one place.

Generator rental, construction or facilities blog?

Link to this calculator so readers can size their diesel budget:

<a href="https://iotee.ae/generator-fuel-consumption-calculator/">Diesel Generator Fuel Consumption Calculator (L/h by kVA)</a>

Generator Fuel — FAQ

Roughly 0.27 litres per kWh delivered at full load, so a 100 kVA (80 kW) set burns about 21.6 L/h flat out, 15.8 L/h at 75%, 10.8 L/h at 50% and 6.3 L/h at 25%. A 500 kVA set uses about 78.8 L/h at 75%. Manufacturer charts vary ±10% by engine family, altitude and ambient temperature — UAE summer heat derates output and pushes consumption to the upper end.
Fuel use does not fall to zero with load. At no load an engine still burns about 15% of its full-load rate to overcome friction and keep 1,500 rpm, and at 25% load about 28.999999999999996%. That is why cost per kWh doubles at low load — and why running a set below 30% load for long periods also causes wet-stacking (unburned fuel in the exhaust) and shortens engine life. Right-size the set or use load-sharing.
Compare litres delivered (supplier invoices) with litres the generators could physically have burned (run hours × L/h for the actual load). The gap on unmetered sites is typically 5–15% — siphoning from tanks, deliveries shorter than the invoice, and fuel diverted to private vehicles. A tank-level sensor with GPS reporting logs every fill and every drop, timestamped, so a 200-litre drop at 2 a.m. is an alert, not a month-end surprise.
Fuel level (ultrasonic or capacitive probe in the day tank and bulk tank), run hours from the alternator or ignition signal, load via a CT clamp or the controller's Modbus output, battery voltage, coolant temperature and oil pressure alarms, and location for rental units. Reports show L/h against the expected curve, litres per kWh, refuel events versus invoices, and service due by run hours — the 250-hour oil interval this calculator counts.
Yes — it defaults to the UAE Fuel Price Committee diesel rate for September 2026, AED 4.30 per litre, updated monthly on our fuel prices page. Bulk deliveries to site are usually priced per tanker with delivery charges and can be above or below pump price; enter your invoice rate for an exact bill.

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