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The wattage (WATTS) or amperes (AMPS) can normally be found stamped or
printed on most devices and equipment, or in the user’s manual. Otherwise,
contact the manufacturer to find out whether the device you want to use is
compatible with a modified sine wave.
To calculate the wattage: Wattage = AMPS x 120 (AC Voltage).
To calculate the starting load: Starting Load = 2 x wattage.
In general, the startup load of the device or power tool determines whether your
inverter has the capability to power it.
Always run a test to establish whether the inverter will operate a particular piece of
equipment or device. In the event of a power overload, the inverter is designed to
automatically shut down. This safety feature prevents damaging the inverter while
testing devices and equipment within the wattage range of the inverter.
This inverter is designed to power 100 watt devices or less when used with the vehicle
12 volt accessory port. To use the full 140 watt output, you must purchase a 12 volt
accessory outlet to battery clips adapter and connect the inverter directly to the battery.
NOTE: The 100 watt limit is to accommodate the fuse ratings for all vehicles.
Some vehicles may allow the full output. If the vehicle fuse blows when you switch
on the device you are trying to use, you must either use a smaller device or
connect the inverter directly to the battery.
IMPORTANT: This inverter uses a modified sine waveform (diagram A) which is
not quite the same as power company electricity (diagram B). For the following
devices, we strongly recommend that you use caution and check the device’s
manual to make sure it is compatible with modified sine waveform.
1. Switch mode power supplies
2. Linear power supplies
3. Class 2 transformers
4. Line filter capacitors
5. Shaded pole motors
6. Fan motors
7. Microwave ovens
8. Fluorescent and high intensity
lamps (with a ballast)
9. Transformerless battery chargers
Using the inverter with any of these devices may cause the device to run warmer
or overheat.
Modified sine waveform
produced by inverter
Diagram A
Diagram B
Pure sine waveform
typical of home AC outlet