Schumacher Power Converter X141B - Manual (Page 4)

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NOTE: Do not use the converter with a product that draws a higher
wattage than the converter can provide, as this may cause damage
to the converter and product.
When you turn on a device or a tool that runs on a motor, the device
basically goes through two stages:
1. Start Up – Requiring an initial surge of power (commonly
known as the “starting load” or “peak load”).
2. Continuous Operation – Power consumption drops (commonly
known as the “continuous load”).
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 WATTS. In
general, the start up load of the device or power tool determines
whether your converter has the capability to power it.
To calculate the continuous load: Continuous Load = AMPS x 120
(AC Voltage).
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.
When using the vehicle’s 12 volt accessory port, this
converter is designed to supply 60 to 70 watts when the vehicle is
not running. With the vehicle’s engine running, it can supply up to
100 watts. To use the full output, you must connect the converter
directly to your battery.
NOTE: The 100 watt limit is to accommodate the fuse ratings
for all vehicles. Some vehicles may allow the full output. If the
fuse blows when you switch on the device you are trying to use,
you have to either use a smaller device or you must connect the
converter directly to the battery.