Samlexpower Evolution EVO-2212 Owner's Manual - page 12
12 | SAMLEX AMERICA INC.
• Devices that use radio frequency signals carried by the AC distribution wiring.
• Some new furnaces with microprocessor control / Oil burner primary controls.
• High intensity discharge (HID) lamps like Metal Halide lamps. These may get damaged. Please
check with the manufacturer of these types of devices for suitability.
• Some fluorescent lamps / light fixtures that have power factor correction capacitors. The
inverter may shut down indicating overload.
• Induction Cooktops.
1.3.3 Power Rating Of Inverters
The Continuous Output Power rating of an inverter is normally specified in Active Power in
Watts for resistive types of loads like heating elements, incandescent lamps etc. where Power
Factor (PF) = 1. The Surge Power rating is specified as a multiple of the Continuous Power Rat-
ing and normally lasts for duration of 1ms to 100ms.
Non resistive / reactive loads with Power Factor < 1 like motors (PF = 0.4 to 0.8), non Power
Factor corrected electronics (PF = 0.5 to 0.6) etc, will draw higher Apparent Power in Volt Amps
(VA). This Apparent Power is the sum of Active Power in Watts plus Reactive Power in VAR and
is = Active Power in Watts ÷ Power Factor. Thus, for such reactive loads, higher sized inverter is
required based on the Apparent Power. Further, all reactive types of loads require higher inrush/
starting surge power that may last for >1 to 5 sec and subsequent lower running power. If the
inverter is not sized adequately based on the type of AC load, it is likely to shut down or fail
prematurely due to repeated overloading.
INFO
The manufacturers’ specification for power rating of the appliances and devices indicates only the
Running Power required. The Surge Power required by some specific 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 1.6 below lists some common loads that require high Surge Power on start up. A “Sizing
Factor” has been recommended against each which is a multiplication factor to be applied
to the rated Running Watt rating of the load to arrive at the Continuous Power Rating of the
inverter (Multiply the running Watts of the device/ appliance by the Sizing Factor to arrive at the
Continuous Power Rating of the inverter).
SECTION 1 |
Safety Instructions & General Information