SECTION 2 |
General Information
12
The power rating of inverters is specified as follows:
• Maximum Continuous Running Power Rating.
• Surge Power Rating to accommodate high, short duration surge of power
required during start up of certain AC appliances and devices.
Please read details of the above two types of power ratings in Section 2.1
under “DEFINITIONS”
INFO
The manufacturers’ specification for power rating of AC appliances and
i
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
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)
