Power Calculator

Generator Power Calculator

If you require any assistance with this power calculator or what generator will best suit your requirements, Calculate your Load Click Here. 

Power Consumption Calculator

Appliance Rated Watts Rated kVA Rated kVA
(Appliances) (To operate appliance) ( To start appliance)
Air Conditioner (Evaporative model) 275-1000 0.34-1.25 1.36-5
Air Conditioner (Reverse cycle) 200-2500 0.25-3.13 1-12.5
Clothes Dryer 2400 3 3
Coffee Percolator 550 0.69 0.69
Can Opener 100 0.13 0.52
Deep Freezer 500 0.63 2.52
Disposal Unit 650 0.81 3.24
Dishwasher 1000-3000 1.25-3.75 1.25-3.75
Domestic Water Pumps 275-1000 0.34-1.25 1.36-5
Exhaust Fan 40 0.05 0.2
Food Processor 500 0.63 2.52
Floor Polisher 350 0.44 1.76
Frypan 1400 1.75 1.75
Hair Dryer 1500 1.88 1.88
Hotwater Service 2500-3000 3.13-3.75 3-13-3.75
Iron 800-1500 1-1.88 1-1.88
Kettle or jug 1600-3000 2-3.75 2-3.75
Lights 25-200 0.03-0.25 0.03-0.25
Microwave 1500 1.88 1.88
Oven 4000-8000 5-10 5-10
Radio 60 0.08 0.08
Radiator 1000-2500 1.25-3.13 115-3.13
Refrigerator (home) 300 0.38 1.52
Sewing Machine 60 0.08 0.32
Space Heater 2000 2-5 2.5
Television 75-200 0.09-0.25 0.09-0.25
Toaster 250-1250 0.3-1.56 0.3-1.56
Washing Machine 500-3000 0.63-3.75 2.52-15
Welder 140A 5000 6.25 8 min

Please Note:

Inductive loads (typically electric motors, electric pumps, electric compressors and air conditioners) require 6-8 times more current to start than to run. Most generators can provide 100% overload for start up purposes. A 1 Hp electric motor therefore will require 3-4kVA for start up. Once the 1 Hp electric motor has started, it will only consume 1 kVA leaving a extra 2-3kVA available for other appliances.

However, the newer ‘Inverter’ style generators may be more efficient and capable of starting higher loads.

Generator Selection

The generator size must be equal or greater than the total consumption of all applications. The higher starting requirement must he taken into account accordingly. To maximise the generator potential, the largest electrical motor should be started on its own and further appliances should only be switched on thereafter.

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