Schumacher Electric SI1479 Manuel D'utilisation page 7

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
converter has the capability to power it.
Always run a test to establish whether the converter will operate a particular
piece of equipment or device. In the event of a power overload, the converter is
designed to automatically shut down.
This safety feature prevents damaging the converter while testing devices and
equipment within the wattage range of the converter.
IMPORTANT: This converter is designed to power 150 watt devices or less when
used with the vehicle's 12 volt accessory port.
NOTE: The 150 watt limit is to accommodate the fuse ratings for all vehicles.
Some vehicles may allow the full output. To use the full output, you must purchase
a 12 volt accessory outlet-to-battery battery clips adapter and connect the inverter
directly to the battery. If the fuse blows when you switch on the device you are
trying to use, you must either use a smaller device or the battery clips adapter.
IMPORTANT: This converter 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. Transformer less battery chargers
Using the converter with any of these devices may cause the device to run warmer
or overheat.
Modified sine waveform
produced by converter
Diagram A Diagram B
Pure sine waveform
typical of home AC outlet
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