OPERATION
BEFORE USING THE ST SWITCH
COMPATIBLE GENERATORS
The ST Switch will only work with generators that have
this Smart Switch Ready outlet. This product will not
work with any other generators. Please see Smart Switch
outlet below.
UNDERSTANDING POWER OUTPUT AND
DEMAND OF APPLIANCES
120 Volt AC devices have two different electric power
demands that must be taken into consideration, namely
the running power and the starting/peak power. Both are
measured in Watts (typically abbreviated as "W").
The steady state continuous load is the running power
demand and this is often marked on the device near
its model number or serial number. Sometimes the
device might only be marked with its voltage (i.e. 120V)
and current draw (e.g. 6 Amp or 6A), in which case the
running power demand in Watts can be obtained by
multiplying the voltage times the current, e.g. 120V × 6A
= 720W.
Simple resistive 120 Volt AC devices such as
incandescent bulbs, toasters, heaters, etc. have no extra
power demand when starting, and so their starting power
demands are the same as their running power demands.
More complex 120 Volt AC devices containing inductive
or capacitive elements such as electric motors have a
momentary extra power demand when starting, which
can be up to seven times the running power demand
or more. Manufacturers of such devices rarely publish
this starting power demand and so it's often necessary
to estimate it. A rule of thumb for devices fitted with an
electric motor is to apply a starting power multiplier of
1.2 for small hand-held or portable devices and a value
of 3.5 for larger stationary devices. For example, a 900W
angle grinder can be assumed to have a starting power
demand of at least 1.2 × 900W, which equals 1,080W.
10
To prevent overloading of the ST Switches 120 Volt AC
system add up the running power demand of all the
120 Volt AC devices that will be connected to the ST
Switch at one time. This total must not be greater than
the power output of the utility power.
RECOMMENDED USE
The list of appliances below is a general guideline.
Always check the wattage of the devices you are
trying to power as ratings may vary. Always test to
confirm ST Switch is not overloaded by appliance
power demands.
When adding up power demands of appliances do
not exceed the rated output of your utility power.
The table below are common appliances that can be
individually powered by the ST Switch. Wattages are
estimations.
TABLE 1: RECOMMEND APPLIANCES
Appliance
Refrigerator or Freezer
Sump Pump (1/3 HP)
Sump Pump (1/2 HP)
Space Heater
Gas or Fuel Furnace (1/8 HP)
Gas or Fuel Furnace (1/6 HP)
Gas or Fuel Furnace (1/4 HP)
Gas or Fuel Furnace (1/2 HP)
10,000 BTU Air Conditioner
15,000 BTU Air Conditioner
NOTICE
Typical Running
Wattage
700W
1300W
2200W
1500W
300W
500W
600W
700W
700W
1500W