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Petrol Powered Inverter Generators

E&OE

Calculating Generator Load

Most electrical devices clearly state the required power, usually in Watts (W). This information is generally

labelled on the device, or listed in its user manual. If a device lists power consumption figures in amperes (A)

only, calculate the wattage by multiplying the ampere rating by the voltage. For example, a 10A device @

240VAC equates to 2400W (10A x 240V). The sum of all devices required to be operating simultaneously

needs to equal or be less than the rated output of the generator.
Many devices require a different load on start-up/shut-down that is often much higher than the actual

continuous running requirements. For example, a water pump may require 2000W to start, and once started,

requires 500W to continue running. When calculating generator load, the start-up requirements need to be

factored in. If the start-up power consumption is not known, the table below lists typical consumption figures

for several device types that may assist in determining how many or which devices may be connected and a

starting order [that is, start the high consumption devices first, followed by devices with no additional start-up

power requirements].

Incandescent

Lamp

Radio

Television

Computer

Laptop

Microwave

Oven

Start-up Watts

50 to 150

100 to 200

150 to 500

800

200

1400

Running Watts

50 to 150

100 to 200

150 to 500

800

200

1400

Slow Cooker

Food

Blender

Power Tool Electric Fan

Deep Fryer

Fluorescent

Lamp

Start-up Watts

250

850

1000 to 1500

600

800 to 2000

N/A

Running Watts

250

400

400 to 600

200

600

As Stated

Iron

Music Player

Refrigerator

(small)

Toaster

Vacuum

Cleaner

Video Player

Start-up Watts

N/A

800 to 2000

600

750 to 1800

N/A

Running Watts

1200

600

200

600 to 1500

Washing

Machine

Water Heater Water Pump

Coffee

Maker

Hair Dryer

Video Game

Start-up Watts

3400

N/A

2500 to 5000 600 to 1500

N/A

Running Watts

1150

3000 to 4500

500 to 1000

600 to 1500

300 to 1200

Example (using the typical values above):

•

To run a radio, electric fan and small refrigerator requires an approximate running power consumption of

100W (radio) + 200W (fan) + 600W (refrigerator) = 0.9kW. However, when factoring in start-up power

requirements, the equation becomes 100W (radio) + 600W (fan) + 1500W (refrigerator) = 2.2kW.

Many generators have a "maximum" output above that of the rated output, which is allowable for a

short period. This is to allow (up to a point) for increased start-up loads that reduce once connected

devices are running. Using the above example, a generator with a rated output of 1.5kW and maximum

output of 2.2kW would be suitable.

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