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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). 570 (W) x 1.2 to 3 = 684 (W) to 1710 (W)
(Output of electrical appliance)
(Efficiency)
= (Power consumption)
Applications
Applicable Wattage (W)
RG4300i
RG4300IS
approx. 3800
approx. 1900
RG2800i
RG2800iS
RG3200i
RG3200iS
approx. 1600
50Hz / 60Hz
approx. 800
Incandescent lamp, Heater, etc approx. 2500 approx. 2800
Fluorescent lamp, Electric tool, etc approx. 1300 approx. 1400
Mercury lamp, etc approx. 800 approx. 1000
Pump, Compressor, etc approx. 500 approx. 600