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Generator Sizing Calculator — UAE

Work out what kVA diesel generator you need for your UAE site. Add your equipment loads — or pick a site preset — and the calculator applies the standard UAE method: power-factor conversion, motor startup surge, operating headroom, and summer heat derating. Then rent the right size from verified suppliers.

Load builder
Recommended generator
—
Total running load—
+ Largest motor startup surge—
÷ Power factor (0.8)—
× Headroom (1.25) × heat derate (1.25)—
Minimum kVA required—
Sized on PRIME power for UAE summer conditions. Specify the next standard size up and target 70–80% steady load. Confirm final sizing with the supplier's engineer.

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Generator sizing — FAQ

What size generator do I need for a UAE site?
Sum simultaneous running loads (kW), add startup surge for the largest motor (2–3× its running kW), divide by 0.8 power factor for kVA, add 25% operating headroom, then a further 20–25% for UAE summer heat. Specify the next standard size up, on prime rating.
How do I convert kW to kVA?
Divide kW by the power factor. UAE sites use 0.8 as standard, so kVA = kW ÷ 0.8.
Why does heat matter?
Diesel output derates ~1% per °C above 25°C. At 45°C that's ~20% lost, so the set must be oversized by 20–25% to deliver rated output in summer.
Prime or standby rating?
For continuous site use, always size on prime power, never standby. The prime figure is what the set delivers continuously under variable load.

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Disclaimer: This calculator provides an indicative generator size for budgeting and planning. It is not an engineering specification. Final generator selection must account for your exact equipment, simultaneity, cable runs, altitude, fuel and load profile, and should be confirmed by a qualified electrical engineer or the supplier. Sizing method follows common UAE practice (0.8 power factor, motor surge, 25% headroom, summer heat derating, prime rating).