14 | SAMLEX AMERICA INC.
INFO
The manufacturers’ specication for power rating of AC appliances and devices indicates only the Maximum
Continuous Running Power Rating. The Starting Surge Power required by some specic types of devices as
explained above 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 1.3.1 provides a list of some common AC appliances / devices that require high Starting Surge Power. 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 1.3.1 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
Ceramic / Positive Temperature Coefcient (PTC) type of heaters 5
Laser Printer / Other Devices using Infrared, Quartz Halogen Heaters 4
Switch Mode Power Supplies (SMPS): no Power Factor correction 2
Photographic Strobe / Flash Lights 4 (See Note 2)
NOTES FOR TABLE 1.3.1:
1 Multiply the Maximum Continuous 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 / ash unit, the Surge Power of the inverter should be > 4 times the Watt Sec rating of
photographic strobe / ash unit.
1.3.4 Electro-Magnetic Interference (EMI) and FCC Compliance
These inverters contain internal switching devices that generate conducted and radiated electromagnetic interference
(EMI). The EMI is unintentional and cannot be entirely eliminated. The magnitude of EMI is, however, limited by circuit
design to acceptable levels as per limits laid down in North American FCC Standard FCC Part 15(B), Class A. These
limits are designed to provide reasonable protection against harmful interference when the equipment is operated in
a residential environment. These inverters can conduct and radiate radio frequency energy and, if not installed and
SECTION 1.3 | General Information – Inverter Related
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