Power load planning & management (cont’d) – North Star M165938N User Manual

Page 12

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Power Load Planning & Management (cont’d)

12


Device

Running

Watts


Device

Running

Watts

Freezer

800 (b)

Submersible pump (1 HP)

2000 (a)

Hair dryer

1200

Submersible pump (1/2 HP)

1500 (a)

Hand drill (1”)

1100

Sump pump

600 (a)

Hand drill (1/2”)

875

Table saw

2000 (a)

Hand drill (3/8”)

500

Television

500

Hand drill (1/4”)

250

Toaster

1000

Hedge trimmer

450

Vacuum cleaner

250

Home computer

150

VCR

70

Impact wrench

500

Water Heater

3000

Weed

trimmer

500

(a) Hard-starting motors require 3-5 times the rated running watts
(b) For extremely hard to start loads such as air conditioners and air compressors, consult the equipment

dealer to determine maximum wattage

To calculate the running and starting wattage requirements for the devices you will be
powering, follow these steps:

1. Make a list of all electrical devices you will be powering at the same time with the generator.
2. List the greater of the running or starting wattage next to each device as obtained from the

devices’ nameplate or Table 1. If only the running wattage for a device with an electric
motor is known, the starting wattage can be estimated to be at least 3 times the running
wattage.

3. Add the wattages for all devices on your list. This total must be lower than the continuous

output rating of your generator.

Example:


Device to be Powered

Greater of Starting/Running

Wattage

Light Bulb

75 W

Refrigerator – 18 Cu. Ft.

1600 W

Microwave

700 W

Window AC

1800 W

Sump pump (1/3 hp)

2100 W

Total

6275W

In this example, the generator must have a continuous output of at least 6275 W in order to power all
of the devices simultaneously.



You can increase the number of devices your generator can power by staggering the load on the
generator. For example, you could alternately power your refrigerator and air conditioner for
limited periods of time -- powering only one of the devices at a time and never powering both at the
same time.

STAGGERING LOADS

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