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Ronix · KSA
BRO Global
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Sizing calculator

How many kVA do you really need?

Enter your load and site conditions. The calculator sizes the set the way our engineers do — with power factor, growth, motor starting and Saudi summer derating — and lists the nearest models from our chart.

Your load and site

Enter how many of each item will run at the same time. Watts are typical running values; motor items (AC, pumps, compressors) are checked separately for their starting surge.

  • LED lamp 10 W

    10 W

  • Tube light 20 W

    20 W

  • Tube light 40 W

    40 W

  • Light bulb 60 W

    60 W

  • Light bulb 100 W

    100 W

  • Energy saver 20 W

    20 W

  • LED floodlight 200 W

    200 W

  • Ceiling / stand fan

    140 W · motor start

  • Air cooler (desert cooler)

    500 W · motor start

  • Split AC 1 ton

    1.3 kW · motor start

  • Split AC 1.5 ton

    1.9 kW · motor start

  • Split AC 2 ton

    2.5 kW · motor start

  • Split AC 2.5 ton

    3.1 kW · motor start

  • Split / ducted AC 3 ton

    3.7 kW · motor start

  • Ducted AC 4 ton

    5 kW · motor start

  • Ducted / package AC 5 ton

    6.2 kW · motor start

  • Package unit / chiller 10 ton

    12 kW · motor start

  • TV 50"

    150 W

  • Satellite receiver / decoder

    60 W

  • Home theatre / sound system

    300 W

  • Wi-Fi router / modem

    30 W

  • Washing machine

    500 W · motor start

  • Clothes dryer

    2.5 kW

  • Iron

    1.2 kW

  • Vacuum cleaner

    1.2 kW · motor start

  • Electric heater

    1.5 kW

  • Elevator (villa / building)

    7.5 kW · motor start

Total connected load0 kVA (0 W) · PF 0.8

Rating and site conditions

Recommended standby rating

— kVA

Add appliances or enter a load to see the recommended size.

Running load
0 kVA
With growth
0 kVA
Site derating
× 0.9
Required (after 10 % margin)
0 kVA
Request a quote for 12 kVA

Nearest sets from our chart

Add appliances or enter a load to see the recommended size.

Indicative sizing for budgeting. Final selection depends on the actual load list, starting method, harmonic loads (UPS, VFD) and the consultant's spec — we confirm all of this in the technical offer.

How the calculator sizes your generator

The same five checks our engineers run on every load schedule — made transparent so you can see where the number comes from.

Read the full sizing guide

  1. 1

    kW to kVA

    Generators are rated in kVA. Running kW ÷ power factor (usually 0.8) gives the apparent power the set must deliver.

  2. 2

    Demand and growth

    Not everything runs at once, so the connected load is multiplied by a demand factor — then a growth allowance is added for future equipment.

  3. 3

    Motor starting

    A direct-on-line motor draws about six times its running kVA for a few seconds. The set must absorb that dip without tripping, so the largest motor is checked separately.

  4. 4

    Site derating

    Heat and altitude thin the air. Above 40 °C we derate ~1 % per °C, and above 1,000 m about 3 % per 300 m.

  5. 5

    Operating margin

    Diesel engines are happiest at 70–90 % load. A 10 % margin keeps the set out of both wet-stacking at low load and overload at peak.

Need a generator on site this month?

Call or WhatsApp our team — we answer with availability and a price the same day.

Contact the generator team