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(5) Appliances without any indication as to power consumption
Some appliances have no indication as to power consumption; but instead the work load (output) is
indicated. In such a case, power consumption is to be worked out according to the numerical formula
mentioned below.
Efficiencies of some electrical appliances are as follows :
Single-phase motor . . . . . .0.6 to 0.75 (The smaller the motor, the lower the efficiency)
Fluorescent lamp . . . . . . . .0.7 to 0.8
Example 1: A 40W fluorescent lamp means that its luminous output is 40W. Its efficiency is 0.7 and
accordingly, power consumption will be 40 0.7= 57W. As explained in Item (2), multiply this
power consumption value of 57W by 1.2 to 2 and you will get the figure of the necessary
capacity of a generator. In other words, a generator with a rated output of 1000W capacity
can light nine to fourteen 40W fluorescent lamps.
Example 2
: Generally speaking, a 400W motor means that its work load is 400W. Efficiency of this motor
is 0.7 and power consumption will be 400 0.7= 570W. When this motor is used for a
motor-driven tool, the capacity of the generator should be multipled by 1.2 to 3 and 570W as
explained in the ltem (3).
The power consumption of electrical appliances is shown below for reference, use this as a measuring
guide when choosing electrical appliances and which generator to use.
Power
Consumption
(W)
300 to 1000
450
800 to 1400
100
1200
1200
800 to 1200
400
100 to 260
1100
500
600
600
40 to 400
Electrical
appliances
Rice Cooker
Coffee Maker
Electric grill
Color TV
Starting
wattage
One of power
consumption
1.2 to 2 times
of power
consumption
Electrical
appliances
Household
Appliances
3 to 5 times
of power
consumption
Hair dryer
Air conditioner
Microwave
Lawn mower
Refrigerator
Vacuum cleaner
Washer
Air Cooler
Deep well pump
Mercury lamp
Electrical Appliances
Power
Consumption
(W)
300 to 1000
600
350 to 600
500 to 1200
1000
1200
1200
800 to 1200
400
1000 to 2600
1100
500
Electrical
appliances
Starting
wattage
Electrical
appliances
Electrical tools
/Architecture
One of power
consumption
1.2 to 2 times
of power
consumption
3 to 5 times
of power
consumption
Soldering iron
Lighting for
young sardines
Drill
Disc Grinder
Electrical hammer
Chain sow
Impact wrench
Vibrator
Drill for shiitake
Air compressor
Winch
water pump
Electrical Appliances
(Output of electrical appliance)
(Efficiency)
= (Power consumption)