SAMLEX AMERICA INC. | 11
Please read details of the above two types of power ratings in Section 2.1 under “DEFINITIONS”
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INFO
The manufacturers’ specification for power rating of AC appliances and devices indicates only the
Maximum Continuous Running Power Rating. The high, short duration surge of power required
during start up of some specific types of devices has to be determined by actual testing or by
checking with the manufacturer. This may not be possible in all cases and hence, can be guessed at
best, based on some general Rules of Thumb.
Table 2.1 provides a list of some common AC appliances / devices that require high, short duration surge of
power during start up. An “Inverter Sizing Factor” has been recommended against each which is a Multiplication
Factor to be applied to the Maximum Continuous Running Power Rating (Active Power Rating in Watts) of the
AC appliance / device to arrive at the Maximum Continuous Running Power Rating of the inverter (Multiply
the Maximum Continuous Running Power Rating (Active Power Rating in Watts) of the appliance / device by
recommended Sizing Factor to arrive at the Maximum Continuous Running Power Rating of the inverter.
TABLE 2.1: INVERTER SIZING FACTOR
Type of Device or Appliance
Inverter Sizing Factor
(See note 1)
Air Conditioner / Refrigerator / Freezer (Compressor based)
5
Air Compressor
4
Sump Pump / Well Pump / Submersible Pump
3
Dishwasher / Clothes Washer
3
Microwave (where rated output power is the cooking power)
2
Furnace Fan
3
Industrial Motor
3
Portable Kerosene / Diesel Fuel Heater
3
Circular Saw / Bench Grinder
3
Incandescent / Halogen / Quartz Lamps
3
PTC (Positive Temperature Coefficient) Type Ceramic Heaters
5
Switch Mode Power Supplies (SMPS): no Power Factor correction
2
Photographic Strobe / Flash Lights
4 (See Note 2)
NOTES FOR TABLE 2.1
1. Multiply the Maximum Continuous Running Power Rating (Active Power Rating in Watts) of the appliance / device
by the recommended Sizing Factor to arrive at the Maximum Continuous Running Power Rating of the inverter.
2. For photographic strobe / flash unit, the Surge Power Rating of the inverter should be > 4 times the Watt Sec rating
of photographic strobe / flash unit.
SECTION 2 |
General Information