Power Load Planning & Management

WARNING

NEVER exceed the rated wattage capacity of your generator.

OVERLOADING may cause SERIOUS DAMAGE to the generator and attached electrical devices, and may result in fire.

Your generator MUST BE SIZED PROPERLY to provide both the running and starting (surge) wattage of the devices you will be powering. Before using your generator, determine the running and starting wattage requirements of all the electrical devices you will be powering simultaneously. The sum of the running and starting wattages of the devices being powered must not exceed the continuous output rating of your generator. (The continuous output rating of your generator is listed in the “Specifications” section of this manual.) Note that:

Devices without electric motors such as light bulbs, radios, and televisions have the same running and starting wattage.

Devices with electric motors such as refrigerators, compressors, and hand tools typically require a starting wattage that is 3 to 5 times greater than the running wattage.

The running and starting wattage requirements are often listed on a device’s nameplate. If wattage is not given on the device’s nameplate, the wattage may be calculated by multiplying the nameplate voltage by nameplate amperage, Watts = Volts X Amps.

Example conversion to watts:

120 Volts X 5 Amps = 600 Watts

If only the running voltage is given on the nameplate for a device with an electric motor, the starting wattage can be approximated to be three to five times the running wattage.

Estimates for the running wattage requirements for common devices are listed in Table 1 below. Guidance for starting wattages is provided in the table’s footnotes.

Table 1

 

Running

 

Running

Device

Watts

Device

Watts

Air conditioner (12.000 BTU)

1700 (a,b)

Jet pump

800 (a)

Battery charger (20 Amp)

500

Lawn mower

1200

Belt sander (3”)

1000

Light bulb (100 Watt)

100

Chain saw

1200

Microwave oven

700

Circular saw (6½”)

2000 (a,b)

Milk cooler

1100 (a)

Coffee maker

1800 (a,b)

Oil burner on furnace

300

Compressor (1 HP)

1400 (a,b)

Oil-fired space heater (140,000 Btu)

400

Compressor (3/4 HP)

1800 (a)

Oil-fired space heater (85,000 Btu)

225

Compressor (1/2 HP)

1400 (a)

Oil-fired space heater (30,000 Btu)

150

Curling iron

700

Oven

4500

Dishwasher

1200

Paint sprayer, Airless (1/3 HP)

600 (a)

Edge trimmer

500

Paint sprayer, Airless (handheld)

150

Electric nail gun

1200

Radio

200

Electric range (1 element)

1500

Refrigerator

600 (b)

Electric skillet

1250

Slow cooker

200

10

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North Star M165957K owner manual Power Load Planning & Management, Example conversion to watts

M165957K specifications

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