User Manual

Note: When using wired remote controller make sure the inverter “ON/OFF”
Switch is in the “ON”position.
IMPORTANT: Vehicle batteries are designed to provide brief
periods of very high current needed for engine starting. They are not intended
for constant deep discharge. Regularly operating the inverter shortens the life
of the battery. Consider connecting the inverter to a separate deep discharge
type battery if you will be frequently running electrical products for
extended periods of time.
4.7 Inverter Load Reference:
Rated Continuous Power:
This rating may be specified as “Active Power” in Watts (W) or “Apparent
Power” in Volt Amps (VA). It is normally specified in“Active Power (P)” in Watts
for Resistive type of loads that have Power factor =1. Reactive types of loads
will draw higher value of “Apparent Power” that is the sum of “Active and
Reactive Powers”. Thus, AC power source should be sized based on the
higher“Apparent Power” Rating in (VA) for all Reactive Types of AC loads. If
the AC power source is sized based on the lower “Active Power” Rating in
Watts (W), the AC power source may be subjected to overload conditions
when powering Reactive Type of loads.
Surge Power Rating:
During start up, certain loads require considerably higher surge of power for
short duration (lasting from tens of milliseconds to few seconds) as compared
to their Maximum Continuous Running Power Rating. The inverter continuous
power should be higher than the surge power rating of these appliances. Some
examples of such loads are given below:
Electric Motors: At the moment when an electric motor is powered ON, the
rotor is stationary (equivalent to being “Locked”), there is no “Back EMF” and
the windings draw a very heavy surge of starting current (Amperes) called
“Locked Rotor Amperes”(LRA) due to low DC resistance of the windings. For
example, in motor driven loads like Air-conditioning and Refrigeration
Compressors and in Well Pumps (using Pressure Tank), the Starting Surge
Current / LRA may be as high as 10 times its rated Full Load Amps (FLA) /
Maximum Continuous Running Power Rating. The value and duration of the
Starting Surge Current / LRA of the motor depends upon the winding design of
the motor and the inertia / resistance to movement of mechanical load being
driven by the motor. As the motor speed rises to its rated RPM, “Back
EMF”proportional to the RPM is generated in the windings and the current
draw reduces proportionately till it draws the running FLA / Maximum
Continuous Running Power Rating at the rated RPM.
Transformers (e.g. Isolation Transformers, Step-up / Step-down Transformers,
Power Transformer in Microwave Oven etc.): At the moment when AC power is